<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="generator" content="rustdoc"> <meta name="description" content="Source to the Rust file `libcore/slice/mod.rs`."> <meta name="keywords" content="rust, rustlang, rust-lang"> <title>mod.rs.html -- source</title> <link rel="stylesheet" type="text/css" href="../../../normalize.css"> <link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"> <link rel="stylesheet" type="text/css" href="../../../dark.css"> <link rel="stylesheet" type="text/css" href="../../../main.css" id="themeStyle"> <script src="../../../storage.js"></script> <link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"> </head> <body class="rustdoc source"> <!--[if lte IE 8]> <div class="warning"> This old browser is unsupported and will most likely display funky things. </div> <![endif]--> <nav class="sidebar"> <div class="sidebar-menu">☰</div> <a href='../../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> </nav> <div class="theme-picker"> <button id="theme-picker" aria-label="Pick another theme!"> <img src="../../../brush.svg" width="18" alt="Pick another theme!"> </button> <div id="theme-choices"></div> </div> <script src="../../../theme.js"></script> <nav class="sub"> <form class="search-form js-only"> <div class="search-container"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"> </div> </form> </nav> <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span id="12"> 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id="648"> 648</span> <span id="649"> 649</span> <span id="650"> 650</span> <span id="651"> 651</span> <span id="652"> 652</span> <span id="653"> 653</span> <span id="654"> 654</span> <span id="655"> 655</span> <span id="656"> 656</span> <span id="657"> 657</span> <span id="658"> 658</span> <span id="659"> 659</span> <span id="660"> 660</span> <span id="661"> 661</span> <span id="662"> 662</span> <span id="663"> 663</span> <span id="664"> 664</span> <span id="665"> 665</span> <span id="666"> 666</span> <span id="667"> 667</span> <span id="668"> 668</span> <span id="669"> 669</span> <span id="670"> 670</span> <span id="671"> 671</span> <span id="672"> 672</span> <span id="673"> 673</span> <span id="674"> 674</span> <span id="675"> 675</span> <span id="676"> 676</span> <span id="677"> 677</span> <span id="678"> 678</span> <span id="679"> 679</span> <span id="680"> 680</span> <span id="681"> 681</span> <span id="682"> 682</span> <span id="683"> 683</span> <span id="684"> 684</span> <span 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id="722"> 722</span> <span id="723"> 723</span> <span id="724"> 724</span> <span id="725"> 725</span> <span id="726"> 726</span> <span id="727"> 727</span> <span id="728"> 728</span> <span id="729"> 729</span> <span id="730"> 730</span> <span id="731"> 731</span> <span id="732"> 732</span> <span id="733"> 733</span> <span id="734"> 734</span> <span id="735"> 735</span> <span id="736"> 736</span> <span id="737"> 737</span> <span id="738"> 738</span> <span id="739"> 739</span> <span id="740"> 740</span> <span id="741"> 741</span> <span id="742"> 742</span> <span id="743"> 743</span> <span id="744"> 744</span> <span id="745"> 745</span> <span id="746"> 746</span> <span id="747"> 747</span> <span id="748"> 748</span> <span id="749"> 749</span> <span id="750"> 750</span> <span id="751"> 751</span> <span id="752"> 752</span> <span id="753"> 753</span> <span id="754"> 754</span> <span id="755"> 755</span> <span id="756"> 756</span> <span id="757"> 757</span> <span id="758"> 758</span> <span id="759"> 759</span> <span id="760"> 760</span> <span id="761"> 761</span> <span id="762"> 762</span> <span id="763"> 763</span> <span id="764"> 764</span> <span id="765"> 765</span> <span id="766"> 766</span> <span id="767"> 767</span> <span id="768"> 768</span> <span id="769"> 769</span> <span id="770"> 770</span> <span id="771"> 771</span> <span id="772"> 772</span> <span id="773"> 773</span> <span id="774"> 774</span> <span id="775"> 775</span> <span id="776"> 776</span> <span id="777"> 777</span> <span id="778"> 778</span> <span id="779"> 779</span> <span id="780"> 780</span> <span id="781"> 781</span> <span id="782"> 782</span> <span id="783"> 783</span> <span id="784"> 784</span> <span id="785"> 785</span> <span id="786"> 786</span> <span id="787"> 787</span> <span id="788"> 788</span> <span id="789"> 789</span> <span id="790"> 790</span> <span id="791"> 791</span> <span id="792"> 792</span> <span id="793"> 793</span> <span id="794"> 794</span> <span id="795"> 795</span> <span id="796"> 796</span> <span id="797"> 797</span> <span id="798"> 798</span> <span id="799"> 799</span> <span id="800"> 800</span> <span id="801"> 801</span> <span id="802"> 802</span> <span id="803"> 803</span> <span id="804"> 804</span> <span id="805"> 805</span> <span id="806"> 806</span> <span id="807"> 807</span> <span id="808"> 808</span> <span id="809"> 809</span> <span id="810"> 810</span> <span id="811"> 811</span> <span id="812"> 812</span> <span id="813"> 813</span> <span id="814"> 814</span> <span id="815"> 815</span> <span id="816"> 816</span> <span id="817"> 817</span> <span id="818"> 818</span> <span id="819"> 819</span> <span id="820"> 820</span> <span id="821"> 821</span> <span id="822"> 822</span> <span id="823"> 823</span> <span id="824"> 824</span> <span id="825"> 825</span> <span id="826"> 826</span> <span id="827"> 827</span> <span id="828"> 828</span> <span id="829"> 829</span> <span id="830"> 830</span> <span id="831"> 831</span> <span id="832"> 832</span> <span id="833"> 833</span> <span id="834"> 834</span> <span id="835"> 835</span> <span id="836"> 836</span> <span id="837"> 837</span> <span id="838"> 838</span> <span id="839"> 839</span> <span id="840"> 840</span> <span id="841"> 841</span> <span id="842"> 842</span> <span id="843"> 843</span> <span id="844"> 844</span> <span id="845"> 845</span> <span id="846"> 846</span> <span id="847"> 847</span> <span id="848"> 848</span> <span id="849"> 849</span> <span id="850"> 850</span> <span id="851"> 851</span> <span id="852"> 852</span> <span id="853"> 853</span> <span id="854"> 854</span> <span id="855"> 855</span> <span id="856"> 856</span> <span id="857"> 857</span> <span id="858"> 858</span> <span id="859"> 859</span> <span id="860"> 860</span> <span id="861"> 861</span> <span id="862"> 862</span> <span id="863"> 863</span> <span id="864"> 864</span> <span id="865"> 865</span> <span id="866"> 866</span> <span id="867"> 867</span> <span id="868"> 868</span> <span id="869"> 869</span> <span id="870"> 870</span> <span id="871"> 871</span> <span id="872"> 872</span> <span id="873"> 873</span> <span id="874"> 874</span> <span id="875"> 875</span> <span id="876"> 876</span> <span id="877"> 877</span> <span id="878"> 878</span> <span id="879"> 879</span> <span id="880"> 880</span> <span id="881"> 881</span> <span id="882"> 882</span> <span id="883"> 883</span> <span id="884"> 884</span> <span id="885"> 885</span> <span id="886"> 886</span> <span id="887"> 887</span> <span id="888"> 888</span> <span id="889"> 889</span> <span id="890"> 890</span> <span id="891"> 891</span> <span id="892"> 892</span> <span id="893"> 893</span> <span id="894"> 894</span> <span id="895"> 895</span> <span id="896"> 896</span> <span id="897"> 897</span> <span id="898"> 898</span> <span id="899"> 899</span> <span id="900"> 900</span> <span id="901"> 901</span> <span id="902"> 902</span> <span id="903"> 903</span> <span id="904"> 904</span> <span id="905"> 905</span> <span id="906"> 906</span> <span id="907"> 907</span> <span id="908"> 908</span> <span id="909"> 909</span> <span id="910"> 910</span> <span id="911"> 911</span> <span id="912"> 912</span> <span id="913"> 913</span> <span id="914"> 914</span> <span id="915"> 915</span> <span id="916"> 916</span> <span id="917"> 917</span> <span id="918"> 918</span> <span id="919"> 919</span> <span id="920"> 920</span> <span id="921"> 921</span> <span id="922"> 922</span> <span id="923"> 923</span> <span id="924"> 924</span> <span id="925"> 925</span> <span id="926"> 926</span> <span id="927"> 927</span> <span id="928"> 928</span> <span id="929"> 929</span> <span id="930"> 930</span> <span id="931"> 931</span> <span id="932"> 932</span> <span id="933"> 933</span> <span id="934"> 934</span> <span id="935"> 935</span> <span id="936"> 936</span> <span id="937"> 937</span> <span id="938"> 938</span> <span id="939"> 939</span> <span id="940"> 940</span> <span id="941"> 941</span> <span id="942"> 942</span> <span id="943"> 943</span> <span id="944"> 944</span> <span id="945"> 945</span> <span id="946"> 946</span> <span id="947"> 947</span> <span id="948"> 948</span> <span id="949"> 949</span> <span id="950"> 950</span> <span id="951"> 951</span> <span id="952"> 952</span> <span id="953"> 953</span> <span id="954"> 954</span> <span id="955"> 955</span> <span id="956"> 956</span> <span id="957"> 957</span> <span id="958"> 958</span> <span id="959"> 959</span> <span id="960"> 960</span> <span id="961"> 961</span> <span id="962"> 962</span> <span id="963"> 963</span> <span id="964"> 964</span> <span id="965"> 965</span> <span id="966"> 966</span> <span id="967"> 967</span> <span id="968"> 968</span> <span id="969"> 969</span> <span id="970"> 970</span> <span id="971"> 971</span> <span id="972"> 972</span> <span id="973"> 973</span> <span id="974"> 974</span> <span id="975"> 975</span> <span id="976"> 976</span> <span id="977"> 977</span> <span id="978"> 978</span> <span id="979"> 979</span> <span id="980"> 980</span> <span id="981"> 981</span> <span id="982"> 982</span> <span id="983"> 983</span> <span id="984"> 984</span> <span id="985"> 985</span> <span id="986"> 986</span> <span id="987"> 987</span> <span id="988"> 988</span> <span id="989"> 989</span> <span id="990"> 990</span> <span id="991"> 991</span> <span id="992"> 992</span> <span id="993"> 993</span> <span id="994"> 994</span> <span id="995"> 995</span> <span id="996"> 996</span> <span id="997"> 997</span> <span id="998"> 998</span> <span id="999"> 999</span> <span id="1000">1000</span> <span id="1001">1001</span> <span id="1002">1002</span> <span id="1003">1003</span> <span id="1004">1004</span> <span id="1005">1005</span> <span id="1006">1006</span> <span id="1007">1007</span> <span id="1008">1008</span> <span id="1009">1009</span> <span id="1010">1010</span> <span id="1011">1011</span> <span id="1012">1012</span> <span id="1013">1013</span> <span id="1014">1014</span> <span id="1015">1015</span> <span id="1016">1016</span> <span id="1017">1017</span> <span id="1018">1018</span> <span id="1019">1019</span> <span id="1020">1020</span> <span id="1021">1021</span> <span id="1022">1022</span> <span id="1023">1023</span> <span id="1024">1024</span> <span id="1025">1025</span> <span id="1026">1026</span> <span id="1027">1027</span> <span id="1028">1028</span> <span id="1029">1029</span> <span id="1030">1030</span> <span id="1031">1031</span> <span id="1032">1032</span> <span id="1033">1033</span> <span id="1034">1034</span> <span id="1035">1035</span> <span id="1036">1036</span> <span id="1037">1037</span> <span id="1038">1038</span> <span id="1039">1039</span> <span id="1040">1040</span> <span id="1041">1041</span> <span id="1042">1042</span> <span id="1043">1043</span> <span id="1044">1044</span> <span id="1045">1045</span> <span id="1046">1046</span> <span id="1047">1047</span> <span id="1048">1048</span> <span id="1049">1049</span> <span id="1050">1050</span> <span id="1051">1051</span> <span id="1052">1052</span> <span id="1053">1053</span> <span id="1054">1054</span> <span id="1055">1055</span> <span id="1056">1056</span> <span id="1057">1057</span> <span id="1058">1058</span> <span id="1059">1059</span> <span id="1060">1060</span> <span id="1061">1061</span> <span id="1062">1062</span> <span id="1063">1063</span> <span id="1064">1064</span> <span id="1065">1065</span> <span id="1066">1066</span> <span id="1067">1067</span> <span id="1068">1068</span> <span id="1069">1069</span> <span id="1070">1070</span> <span id="1071">1071</span> <span id="1072">1072</span> <span id="1073">1073</span> <span id="1074">1074</span> <span id="1075">1075</span> <span id="1076">1076</span> <span id="1077">1077</span> <span id="1078">1078</span> <span id="1079">1079</span> <span id="1080">1080</span> <span id="1081">1081</span> <span id="1082">1082</span> <span id="1083">1083</span> <span id="1084">1084</span> <span id="1085">1085</span> <span id="1086">1086</span> <span id="1087">1087</span> <span id="1088">1088</span> <span id="1089">1089</span> <span id="1090">1090</span> <span id="1091">1091</span> <span id="1092">1092</span> <span id="1093">1093</span> <span id="1094">1094</span> <span id="1095">1095</span> <span id="1096">1096</span> <span id="1097">1097</span> <span id="1098">1098</span> <span id="1099">1099</span> <span id="1100">1100</span> <span id="1101">1101</span> <span id="1102">1102</span> <span id="1103">1103</span> <span id="1104">1104</span> <span id="1105">1105</span> <span id="1106">1106</span> <span id="1107">1107</span> <span id="1108">1108</span> <span id="1109">1109</span> <span id="1110">1110</span> <span id="1111">1111</span> <span id="1112">1112</span> <span id="1113">1113</span> <span id="1114">1114</span> <span id="1115">1115</span> <span id="1116">1116</span> <span id="1117">1117</span> <span id="1118">1118</span> <span id="1119">1119</span> <span id="1120">1120</span> <span id="1121">1121</span> <span id="1122">1122</span> <span id="1123">1123</span> <span id="1124">1124</span> <span id="1125">1125</span> <span id="1126">1126</span> <span id="1127">1127</span> <span id="1128">1128</span> <span id="1129">1129</span> <span id="1130">1130</span> <span id="1131">1131</span> <span id="1132">1132</span> <span id="1133">1133</span> <span id="1134">1134</span> <span id="1135">1135</span> <span id="1136">1136</span> <span id="1137">1137</span> <span id="1138">1138</span> <span id="1139">1139</span> <span id="1140">1140</span> <span id="1141">1141</span> <span id="1142">1142</span> <span id="1143">1143</span> <span id="1144">1144</span> <span id="1145">1145</span> <span id="1146">1146</span> <span id="1147">1147</span> <span id="1148">1148</span> <span id="1149">1149</span> <span id="1150">1150</span> <span id="1151">1151</span> <span id="1152">1152</span> <span id="1153">1153</span> <span id="1154">1154</span> <span id="1155">1155</span> <span id="1156">1156</span> <span id="1157">1157</span> <span id="1158">1158</span> <span id="1159">1159</span> <span id="1160">1160</span> <span id="1161">1161</span> <span id="1162">1162</span> <span id="1163">1163</span> <span id="1164">1164</span> <span id="1165">1165</span> <span id="1166">1166</span> <span id="1167">1167</span> <span id="1168">1168</span> <span id="1169">1169</span> <span id="1170">1170</span> <span id="1171">1171</span> <span id="1172">1172</span> <span id="1173">1173</span> <span id="1174">1174</span> <span id="1175">1175</span> <span id="1176">1176</span> <span id="1177">1177</span> <span id="1178">1178</span> <span id="1179">1179</span> <span id="1180">1180</span> <span id="1181">1181</span> <span id="1182">1182</span> <span id="1183">1183</span> <span id="1184">1184</span> <span id="1185">1185</span> <span id="1186">1186</span> <span id="1187">1187</span> <span id="1188">1188</span> <span id="1189">1189</span> <span id="1190">1190</span> <span id="1191">1191</span> <span id="1192">1192</span> <span id="1193">1193</span> <span id="1194">1194</span> <span id="1195">1195</span> <span id="1196">1196</span> <span id="1197">1197</span> <span id="1198">1198</span> <span id="1199">1199</span> <span id="1200">1200</span> <span id="1201">1201</span> <span id="1202">1202</span> <span id="1203">1203</span> <span id="1204">1204</span> <span id="1205">1205</span> <span id="1206">1206</span> <span id="1207">1207</span> <span id="1208">1208</span> <span id="1209">1209</span> <span id="1210">1210</span> <span id="1211">1211</span> <span id="1212">1212</span> <span id="1213">1213</span> <span id="1214">1214</span> <span id="1215">1215</span> <span id="1216">1216</span> <span id="1217">1217</span> <span id="1218">1218</span> <span id="1219">1219</span> <span id="1220">1220</span> <span id="1221">1221</span> <span id="1222">1222</span> <span id="1223">1223</span> <span id="1224">1224</span> <span id="1225">1225</span> <span id="1226">1226</span> <span id="1227">1227</span> <span id="1228">1228</span> <span id="1229">1229</span> <span id="1230">1230</span> <span id="1231">1231</span> <span id="1232">1232</span> <span id="1233">1233</span> <span id="1234">1234</span> <span id="1235">1235</span> <span id="1236">1236</span> <span id="1237">1237</span> <span id="1238">1238</span> <span id="1239">1239</span> <span id="1240">1240</span> <span id="1241">1241</span> <span id="1242">1242</span> <span id="1243">1243</span> <span id="1244">1244</span> <span id="1245">1245</span> <span id="1246">1246</span> <span id="1247">1247</span> <span id="1248">1248</span> <span id="1249">1249</span> <span id="1250">1250</span> <span id="1251">1251</span> <span id="1252">1252</span> <span id="1253">1253</span> <span id="1254">1254</span> <span id="1255">1255</span> <span id="1256">1256</span> <span id="1257">1257</span> <span id="1258">1258</span> <span id="1259">1259</span> <span id="1260">1260</span> <span id="1261">1261</span> <span id="1262">1262</span> <span id="1263">1263</span> <span id="1264">1264</span> <span id="1265">1265</span> <span id="1266">1266</span> <span id="1267">1267</span> <span id="1268">1268</span> <span id="1269">1269</span> <span id="1270">1270</span> <span id="1271">1271</span> <span id="1272">1272</span> <span id="1273">1273</span> <span id="1274">1274</span> <span id="1275">1275</span> <span id="1276">1276</span> <span id="1277">1277</span> <span id="1278">1278</span> <span id="1279">1279</span> <span id="1280">1280</span> <span id="1281">1281</span> <span id="1282">1282</span> <span id="1283">1283</span> <span id="1284">1284</span> <span id="1285">1285</span> <span id="1286">1286</span> <span id="1287">1287</span> <span id="1288">1288</span> <span id="1289">1289</span> <span id="1290">1290</span> <span id="1291">1291</span> <span id="1292">1292</span> <span id="1293">1293</span> <span id="1294">1294</span> <span id="1295">1295</span> <span id="1296">1296</span> <span 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id="1927">1927</span> <span id="1928">1928</span> <span id="1929">1929</span> <span id="1930">1930</span> <span id="1931">1931</span> <span id="1932">1932</span> <span id="1933">1933</span> <span id="1934">1934</span> <span id="1935">1935</span> <span id="1936">1936</span> <span id="1937">1937</span> <span id="1938">1938</span> <span id="1939">1939</span> <span id="1940">1940</span> <span id="1941">1941</span> <span id="1942">1942</span> <span id="1943">1943</span> <span id="1944">1944</span> <span id="1945">1945</span> <span id="1946">1946</span> <span id="1947">1947</span> <span id="1948">1948</span> <span id="1949">1949</span> <span id="1950">1950</span> <span id="1951">1951</span> <span id="1952">1952</span> <span id="1953">1953</span> <span id="1954">1954</span> <span id="1955">1955</span> <span id="1956">1956</span> <span id="1957">1957</span> <span id="1958">1958</span> <span id="1959">1959</span> <span id="1960">1960</span> <span id="1961">1961</span> <span 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id="1997">1997</span> <span id="1998">1998</span> <span id="1999">1999</span> <span id="2000">2000</span> <span id="2001">2001</span> <span id="2002">2002</span> <span id="2003">2003</span> <span id="2004">2004</span> <span id="2005">2005</span> <span id="2006">2006</span> <span id="2007">2007</span> <span id="2008">2008</span> <span id="2009">2009</span> <span id="2010">2010</span> <span id="2011">2011</span> <span id="2012">2012</span> <span id="2013">2013</span> <span id="2014">2014</span> <span id="2015">2015</span> <span id="2016">2016</span> <span id="2017">2017</span> <span id="2018">2018</span> <span id="2019">2019</span> <span id="2020">2020</span> <span id="2021">2021</span> <span id="2022">2022</span> <span id="2023">2023</span> <span id="2024">2024</span> <span id="2025">2025</span> <span id="2026">2026</span> <span id="2027">2027</span> <span id="2028">2028</span> <span id="2029">2029</span> <span id="2030">2030</span> <span id="2031">2031</span> <span id="2032">2032</span> <span id="2033">2033</span> <span id="2034">2034</span> <span id="2035">2035</span> <span id="2036">2036</span> <span id="2037">2037</span> <span id="2038">2038</span> <span id="2039">2039</span> <span id="2040">2040</span> <span id="2041">2041</span> <span id="2042">2042</span> <span id="2043">2043</span> <span id="2044">2044</span> <span id="2045">2045</span> <span id="2046">2046</span> <span id="2047">2047</span> <span id="2048">2048</span> <span id="2049">2049</span> <span id="2050">2050</span> <span id="2051">2051</span> <span id="2052">2052</span> <span id="2053">2053</span> <span id="2054">2054</span> <span id="2055">2055</span> <span id="2056">2056</span> <span id="2057">2057</span> <span id="2058">2058</span> <span id="2059">2059</span> <span id="2060">2060</span> <span id="2061">2061</span> <span id="2062">2062</span> <span id="2063">2063</span> <span id="2064">2064</span> <span id="2065">2065</span> <span id="2066">2066</span> <span 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id="2172">2172</span> <span id="2173">2173</span> <span id="2174">2174</span> <span id="2175">2175</span> <span id="2176">2176</span> <span id="2177">2177</span> <span id="2178">2178</span> <span id="2179">2179</span> <span id="2180">2180</span> <span id="2181">2181</span> <span id="2182">2182</span> <span id="2183">2183</span> <span id="2184">2184</span> <span id="2185">2185</span> <span id="2186">2186</span> <span id="2187">2187</span> <span id="2188">2188</span> <span id="2189">2189</span> <span id="2190">2190</span> <span id="2191">2191</span> <span id="2192">2192</span> <span id="2193">2193</span> <span id="2194">2194</span> <span id="2195">2195</span> <span id="2196">2196</span> <span id="2197">2197</span> <span id="2198">2198</span> <span id="2199">2199</span> <span id="2200">2200</span> <span id="2201">2201</span> <span id="2202">2202</span> <span id="2203">2203</span> <span id="2204">2204</span> <span id="2205">2205</span> <span id="2206">2206</span> <span 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id="2487">2487</span> <span id="2488">2488</span> <span id="2489">2489</span> <span id="2490">2490</span> <span id="2491">2491</span> <span id="2492">2492</span> <span id="2493">2493</span> <span id="2494">2494</span> <span id="2495">2495</span> <span id="2496">2496</span> <span id="2497">2497</span> <span id="2498">2498</span> <span id="2499">2499</span> <span id="2500">2500</span> <span id="2501">2501</span> <span id="2502">2502</span> <span id="2503">2503</span> <span id="2504">2504</span> <span id="2505">2505</span> <span id="2506">2506</span> <span id="2507">2507</span> <span id="2508">2508</span> <span id="2509">2509</span> <span id="2510">2510</span> <span id="2511">2511</span> <span id="2512">2512</span> <span id="2513">2513</span> <span id="2514">2514</span> <span id="2515">2515</span> <span id="2516">2516</span> <span id="2517">2517</span> <span id="2518">2518</span> <span id="2519">2519</span> <span id="2520">2520</span> <span id="2521">2521</span> <span 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id="2732">2732</span> <span id="2733">2733</span> <span id="2734">2734</span> <span id="2735">2735</span> <span id="2736">2736</span> <span id="2737">2737</span> <span id="2738">2738</span> <span id="2739">2739</span> <span id="2740">2740</span> <span id="2741">2741</span> <span id="2742">2742</span> <span id="2743">2743</span> <span id="2744">2744</span> <span id="2745">2745</span> <span id="2746">2746</span> <span id="2747">2747</span> <span id="2748">2748</span> <span id="2749">2749</span> <span id="2750">2750</span> <span id="2751">2751</span> <span id="2752">2752</span> <span id="2753">2753</span> <span id="2754">2754</span> <span id="2755">2755</span> <span id="2756">2756</span> <span id="2757">2757</span> <span id="2758">2758</span> <span id="2759">2759</span> <span id="2760">2760</span> <span id="2761">2761</span> <span id="2762">2762</span> <span id="2763">2763</span> <span id="2764">2764</span> <span id="2765">2765</span> <span id="2766">2766</span> <span id="2767">2767</span> <span id="2768">2768</span> <span id="2769">2769</span> <span id="2770">2770</span> <span id="2771">2771</span> <span id="2772">2772</span> <span id="2773">2773</span> <span id="2774">2774</span> <span id="2775">2775</span> <span id="2776">2776</span> <span id="2777">2777</span> <span id="2778">2778</span> <span id="2779">2779</span> <span id="2780">2780</span> <span id="2781">2781</span> <span id="2782">2782</span> <span id="2783">2783</span> <span id="2784">2784</span> <span id="2785">2785</span> <span id="2786">2786</span> <span id="2787">2787</span> <span id="2788">2788</span> <span id="2789">2789</span> <span id="2790">2790</span> <span id="2791">2791</span> <span id="2792">2792</span> <span id="2793">2793</span> <span id="2794">2794</span> <span id="2795">2795</span> <span id="2796">2796</span> <span id="2797">2797</span> <span id="2798">2798</span> <span id="2799">2799</span> <span id="2800">2800</span> <span id="2801">2801</span> <span id="2802">2802</span> <span id="2803">2803</span> <span id="2804">2804</span> <span id="2805">2805</span> <span id="2806">2806</span> <span id="2807">2807</span> <span id="2808">2808</span> <span id="2809">2809</span> <span id="2810">2810</span> <span id="2811">2811</span> <span id="2812">2812</span> <span id="2813">2813</span> <span id="2814">2814</span> <span id="2815">2815</span> <span id="2816">2816</span> <span id="2817">2817</span> <span id="2818">2818</span> <span id="2819">2819</span> <span id="2820">2820</span> <span id="2821">2821</span> <span id="2822">2822</span> <span id="2823">2823</span> <span id="2824">2824</span> <span id="2825">2825</span> <span id="2826">2826</span> <span id="2827">2827</span> <span id="2828">2828</span> <span id="2829">2829</span> <span id="2830">2830</span> <span id="2831">2831</span> <span id="2832">2832</span> <span id="2833">2833</span> <span id="2834">2834</span> <span id="2835">2835</span> <span id="2836">2836</span> <span id="2837">2837</span> <span id="2838">2838</span> <span id="2839">2839</span> <span id="2840">2840</span> <span id="2841">2841</span> <span id="2842">2842</span> <span id="2843">2843</span> <span id="2844">2844</span> <span id="2845">2845</span> <span id="2846">2846</span> <span id="2847">2847</span> <span id="2848">2848</span> <span id="2849">2849</span> <span id="2850">2850</span> <span id="2851">2851</span> <span id="2852">2852</span> <span id="2853">2853</span> <span id="2854">2854</span> <span id="2855">2855</span> <span id="2856">2856</span> <span id="2857">2857</span> <span id="2858">2858</span> <span id="2859">2859</span> <span id="2860">2860</span> <span id="2861">2861</span> <span id="2862">2862</span> <span id="2863">2863</span> <span id="2864">2864</span> <span id="2865">2865</span> <span id="2866">2866</span> <span id="2867">2867</span> <span id="2868">2868</span> <span id="2869">2869</span> <span id="2870">2870</span> <span id="2871">2871</span> <span id="2872">2872</span> <span id="2873">2873</span> <span id="2874">2874</span> <span id="2875">2875</span> <span id="2876">2876</span> <span id="2877">2877</span> <span id="2878">2878</span> <span id="2879">2879</span> <span id="2880">2880</span> <span id="2881">2881</span> <span id="2882">2882</span> <span id="2883">2883</span> <span id="2884">2884</span> <span id="2885">2885</span> <span id="2886">2886</span> <span id="2887">2887</span> <span id="2888">2888</span> <span id="2889">2889</span> <span id="2890">2890</span> <span id="2891">2891</span> <span id="2892">2892</span> <span id="2893">2893</span> <span id="2894">2894</span> <span id="2895">2895</span> <span id="2896">2896</span> <span id="2897">2897</span> <span id="2898">2898</span> <span id="2899">2899</span> <span id="2900">2900</span> <span id="2901">2901</span> <span id="2902">2902</span> <span id="2903">2903</span> <span id="2904">2904</span> <span id="2905">2905</span> <span id="2906">2906</span> <span id="2907">2907</span> <span id="2908">2908</span> <span id="2909">2909</span> <span id="2910">2910</span> <span id="2911">2911</span> <span id="2912">2912</span> <span id="2913">2913</span> <span id="2914">2914</span> <span id="2915">2915</span> <span id="2916">2916</span> <span id="2917">2917</span> <span id="2918">2918</span> <span id="2919">2919</span> <span id="2920">2920</span> <span id="2921">2921</span> <span id="2922">2922</span> <span id="2923">2923</span> <span id="2924">2924</span> <span id="2925">2925</span> <span id="2926">2926</span> <span id="2927">2927</span> <span id="2928">2928</span> <span id="2929">2929</span> <span id="2930">2930</span> <span id="2931">2931</span> <span id="2932">2932</span> <span id="2933">2933</span> <span id="2934">2934</span> <span id="2935">2935</span> <span id="2936">2936</span> <span id="2937">2937</span> <span id="2938">2938</span> <span id="2939">2939</span> <span id="2940">2940</span> <span id="2941">2941</span> <span id="2942">2942</span> <span id="2943">2943</span> <span id="2944">2944</span> <span id="2945">2945</span> <span id="2946">2946</span> <span id="2947">2947</span> <span id="2948">2948</span> <span id="2949">2949</span> <span id="2950">2950</span> <span id="2951">2951</span> <span id="2952">2952</span> <span id="2953">2953</span> <span id="2954">2954</span> <span id="2955">2955</span> <span id="2956">2956</span> <span id="2957">2957</span> <span id="2958">2958</span> <span id="2959">2959</span> <span id="2960">2960</span> <span id="2961">2961</span> <span id="2962">2962</span> </pre><pre class="rust "> <span class="comment">// Copyright 2012-2017 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="doccomment">//! Slice management and manipulation</span> <span class="doccomment">//!</span> <span class="doccomment">//! For more details see [`std::slice`].</span> <span class="doccomment">//!</span> <span class="doccomment">//! [`std::slice`]: ../../std/slice/index.html</span> <span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="comment">// How this module is organized.</span> <span class="comment">//</span> <span class="comment">// The library infrastructure for slices is fairly messy. There's</span> <span class="comment">// a lot of stuff defined here. Let's keep it clean.</span> <span class="comment">//</span> <span class="comment">// Since slices don't support inherent methods; all operations</span> <span class="comment">// on them are defined on traits, which are then re-exported from</span> <span class="comment">// the prelude for convenience. So there are a lot of traits here.</span> <span class="comment">//</span> <span class="comment">// The layout of this file is thus:</span> <span class="comment">//</span> <span class="comment">// * Slice-specific 'extension' traits and their implementations. This</span> <span class="comment">// is where most of the slice API resides.</span> <span class="comment">// * Implementations of a few common traits with important slice ops.</span> <span class="comment">// * Definitions of a bunch of iterators.</span> <span class="comment">// * Free functions.</span> <span class="comment">// * The `raw` and `bytes` submodules.</span> <span class="comment">// * Boilerplate trait implementations.</span> <span class="kw">use</span> <span class="ident">cmp</span>::<span class="ident">Ordering</span>::{<span class="self">self</span>, <span class="ident">Less</span>, <span class="ident">Equal</span>, <span class="ident">Greater</span>}; <span class="kw">use</span> <span class="ident">cmp</span>; <span class="kw">use</span> <span class="ident">fmt</span>; <span class="kw">use</span> <span class="ident">intrinsics</span>::<span class="ident">assume</span>; <span class="kw">use</span> <span class="ident">iter</span>::<span class="kw-2">*</span>; <span class="kw">use</span> <span class="ident">ops</span>::{<span class="ident">FnMut</span>, <span class="ident">Try</span>, <span class="self">self</span>}; <span class="kw">use</span> <span class="ident">option</span>::<span class="prelude-ty">Option</span>; <span class="kw">use</span> <span class="ident">option</span>::<span class="prelude-ty">Option</span>::{<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>}; <span class="kw">use</span> <span class="ident">result</span>::<span class="prelude-ty">Result</span>; <span class="kw">use</span> <span class="ident">result</span>::<span class="prelude-ty">Result</span>::{<span class="prelude-val">Ok</span>, <span class="prelude-val">Err</span>}; <span class="kw">use</span> <span class="ident">ptr</span>; <span class="kw">use</span> <span class="ident">mem</span>; <span class="kw">use</span> <span class="ident">marker</span>::{<span class="ident">Copy</span>, <span class="ident">Send</span>, <span class="ident">Sync</span>, <span class="ident">Sized</span>, <span class="self">self</span>}; <span class="kw">use</span> <span class="ident">iter_private</span>::<span class="ident">TrustedRandomAccess</span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"exposed from core to be reused in std; use the memchr crate"</span>)]</span> <span class="doccomment">/// Pure rust memchr implementation, taken from rust-memchr</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">memchr</span>; <span class="kw">mod</span> <span class="ident">rotate</span>; <span class="kw">mod</span> <span class="ident">sort</span>; <span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span> <span class="kw">struct</span> <span class="ident">Repr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">pub</span> <span class="ident">data</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="kw">pub</span> <span class="ident">len</span>: <span class="ident">usize</span>, } <span class="comment">//</span> <span class="comment">// Extension traits</span> <span class="comment">//</span> <span class="doccomment">/// Extension methods for slices.</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_slice_ext"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"stable interface provided by `impl [T]` in later crates"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32110"</span>)]</span> <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_docs</span>)]</span> <span class="comment">// documented elsewhere</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">SliceExt</span> { <span class="kw">type</span> <span class="ident">Item</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">split_at</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">mid</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="kw-2">&</span>[<span class="self">Self</span>::<span class="ident">Item</span>], <span class="kw-2">&</span>[<span class="self">Self</span>::<span class="ident">Item</span>]); <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">iter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">split</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">Split</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">fn</span> <span class="ident">rsplit</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">RSplit</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">splitn</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">SplitN</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">rsplitn</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">RSplitN</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">windows</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Windows</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">chunks</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Chunks</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">fn</span> <span class="ident">exact_chunks</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">I</span>::<span class="ident">Output</span><span class="op">></span> <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">first</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">split_first</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="kw-2">&</span>[<span class="self">Self</span>::<span class="ident">Item</span>])<span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">split_last</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="kw-2">&</span>[<span class="self">Self</span>::<span class="ident">Item</span>])<span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">I</span>::<span class="ident">Output</span> <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">as_ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="self">Self</span>::<span class="ident">Item</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">binary_search</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">usize</span><span class="op">></span> <span class="kw">where</span> <span class="self">Self</span>::<span class="ident">Item</span>: <span class="ident">Ord</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">binary_search_by</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">usize</span><span class="op">></span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">Ordering</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_binary_search_by_key"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">binary_search_by_key</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">B</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">b</span>: <span class="kw-2">&</span><span class="ident">B</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">usize</span><span class="op">></span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">B</span>, <span class="ident">B</span>: <span class="ident">Ord</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">get_mut</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">I</span>::<span class="ident">Output</span><span class="op">></span> <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">iter_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">IterMut</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">first_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">split_first_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Item</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="self">Self</span>::<span class="ident">Item</span>])<span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">split_last_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Item</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="self">Self</span>::<span class="ident">Item</span>])<span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">last_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">split_mut</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">SplitMut</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">fn</span> <span class="ident">rsplit_mut</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">RSplitMut</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">splitn_mut</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">SplitNMut</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">rsplitn_mut</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">RSplitNMut</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">chunks_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">chunk_size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">fn</span> <span class="ident">exact_chunks_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ExactChunksMut</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">swap</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">a</span>: <span class="ident">usize</span>, <span class="ident">b</span>: <span class="ident">usize</span>); <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">split_at_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">mid</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="self">Self</span>::<span class="ident">Item</span>], <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="self">Self</span>::<span class="ident">Item</span>]); <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">reverse</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>); <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">I</span>::<span class="ident">Output</span> <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">as_mut_ptr</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Item</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">contains</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="self">Self</span>::<span class="ident">Item</span>: <span class="ident">PartialEq</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">starts_with</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">needle</span>: <span class="kw-2">&</span>[<span class="self">Self</span>::<span class="ident">Item</span>]) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="self">Self</span>::<span class="ident">Item</span>: <span class="ident">PartialEq</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">ends_with</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">needle</span>: <span class="kw-2">&</span>[<span class="self">Self</span>::<span class="ident">Item</span>]) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="self">Self</span>::<span class="ident">Item</span>: <span class="ident">PartialEq</span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rotate"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41891"</span>)]</span> <span class="kw">fn</span> <span class="ident">rotate_left</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">mid</span>: <span class="ident">usize</span>); <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rotate"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41891"</span>)]</span> <span class="kw">fn</span> <span class="ident">rotate_right</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">k</span>: <span class="ident">usize</span>); <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"clone_from_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.7.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">clone_from_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">src</span>: <span class="kw-2">&</span>[<span class="self">Self</span>::<span class="ident">Item</span>]) <span class="kw">where</span> <span class="self">Self</span>::<span class="ident">Item</span>: <span class="ident">Clone</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"copy_from_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">src</span>: <span class="kw-2">&</span>[<span class="self">Self</span>::<span class="ident">Item</span>]) <span class="kw">where</span> <span class="self">Self</span>::<span class="ident">Item</span>: <span class="ident">Copy</span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"swap_with_slice"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"44030"</span>)]</span> <span class="kw">fn</span> <span class="ident">swap_with_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">src</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="self">Self</span>::<span class="ident">Item</span>]); <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"sort_unstable"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">sort_unstable</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="kw">where</span> <span class="self">Self</span>::<span class="ident">Item</span>: <span class="ident">Ord</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"sort_unstable"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">sort_unstable_by</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">compare</span>: <span class="ident">F</span>) <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">Ordering</span>; <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"sort_unstable"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">sort_unstable_by_key</span><span class="op"><</span><span class="ident">B</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">B</span>, <span class="ident">B</span>: <span class="ident">Ord</span>; } <span class="comment">// Use macros to be generic over const/mut</span> <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">slice_offset</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ptr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">by</span>:<span class="ident">expr</span>) <span class="op">=></span> {{ <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ptr</span>; <span class="kw">if</span> <span class="ident">size_from_ptr</span>(<span class="ident">ptr</span>) <span class="op">==</span> <span class="number">0</span> { (<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">i8</span>).<span class="ident">wrapping_offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">by</span>) <span class="kw">as</span> _ } <span class="kw">else</span> { <span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">by</span>) } }}; } <span class="comment">// make a &T from a *const T</span> <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">make_ref</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ptr</span>:<span class="ident">expr</span>) <span class="op">=></span> {{ <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ptr</span>; <span class="kw">if</span> <span class="ident">size_from_ptr</span>(<span class="ident">ptr</span>) <span class="op">==</span> <span class="number">0</span> { <span class="comment">// Use a non-null pointer value</span> <span class="kw-2">&</span><span class="kw-2">*</span>(<span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _) } <span class="kw">else</span> { <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">ptr</span> } }}; } <span class="comment">// make a &mut T from a *mut T</span> <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">make_ref_mut</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ptr</span>:<span class="ident">expr</span>) <span class="op">=></span> {{ <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ptr</span>; <span class="kw">if</span> <span class="ident">size_from_ptr</span>(<span class="ident">ptr</span>) <span class="op">==</span> <span class="number">0</span> { <span class="comment">// Use a non-null pointer value</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _) } <span class="kw">else</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">ptr</span> } }}; } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_slice_ext"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"stable interface provided by `impl [T]` in later crates"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32110"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceExt</span> <span class="kw">for</span> [<span class="ident">T</span>] { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">split_at</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">mid</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="kw-2">&</span>[<span class="ident">T</span>], <span class="kw-2">&</span>[<span class="ident">T</span>]) { (<span class="kw-2">&</span><span class="self">self</span>[..<span class="ident">mid</span>], <span class="kw-2">&</span><span class="self">self</span>[<span class="ident">mid</span>..]) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">iter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">==</span> <span class="number">0</span> { <span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _ } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_ptr</span>(); <span class="ident">assume</span>(<span class="op">!</span><span class="ident">p</span>.<span class="ident">is_null</span>()); <span class="ident">p</span> }; <span class="ident">Iter</span> { <span class="ident">ptr</span>: <span class="ident">p</span>, <span class="ident">end</span>: <span class="macro">slice_offset</span><span class="macro">!</span>(<span class="ident">p</span>, <span class="self">self</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">_marker</span>: <span class="ident">marker</span>::<span class="ident">PhantomData</span> } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">split</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">Split</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">Split</span> { <span class="ident">v</span>: <span class="self">self</span>, <span class="ident">pred</span>, <span class="ident">finished</span>: <span class="bool-val">false</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">rsplit</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">RSplit</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">RSplit</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">split</span>(<span class="ident">pred</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">splitn</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">SplitN</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">SplitN</span> { <span class="ident">inner</span>: <span class="ident">GenericSplitN</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">split</span>(<span class="ident">pred</span>), <span class="ident">count</span>: <span class="ident">n</span> } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">rsplitn</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">RSplitN</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">RSplitN</span> { <span class="ident">inner</span>: <span class="ident">GenericSplitN</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">rsplit</span>(<span class="ident">pred</span>), <span class="ident">count</span>: <span class="ident">n</span> } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">windows</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Windows</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">size</span> <span class="op">!=</span> <span class="number">0</span>); <span class="ident">Windows</span> { <span class="ident">v</span>: <span class="self">self</span>, <span class="ident">size</span>: <span class="ident">size</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">chunks</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">chunk_size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Chunks</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">chunk_size</span> <span class="op">!=</span> <span class="number">0</span>); <span class="ident">Chunks</span> { <span class="ident">v</span>: <span class="self">self</span>, <span class="ident">chunk_size</span>: <span class="ident">chunk_size</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">exact_chunks</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">chunk_size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">chunk_size</span> <span class="op">!=</span> <span class="number">0</span>); <span class="kw">let</span> <span class="ident">rem</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">%</span> <span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">rem</span>; <span class="ident">ExactChunks</span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="self">self</span>[..<span class="ident">len</span>], <span class="ident">chunk_size</span>: <span class="ident">chunk_size</span>} } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">I</span>::<span class="ident">Output</span><span class="op">></span> <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="ident">index</span>.<span class="ident">get</span>(<span class="self">self</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">first</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="number">0</span>]) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">split_first</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="ident">T</span>, <span class="kw-2">&</span>[<span class="ident">T</span>])<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="self">self</span>[<span class="number">0</span>], <span class="kw-2">&</span><span class="self">self</span>[<span class="number">1</span>..])) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">split_last</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="ident">T</span>, <span class="kw-2">&</span>[<span class="ident">T</span>])<span class="op">></span> { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>], <span class="kw-2">&</span><span class="self">self</span>[..(<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>)])) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>]) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">I</span>::<span class="ident">Output</span> <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="ident">index</span>.<span class="ident">get_unchecked</span>(<span class="self">self</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">as_ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> { <span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> [<span class="ident">T</span>] <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> } <span class="kw">fn</span> <span class="ident">binary_search_by</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">usize</span><span class="op">></span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Ordering</span> { <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="self">self</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">size</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="number">0</span>); } <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">base</span> <span class="op">=</span> <span class="number">0usize</span>; <span class="kw">while</span> <span class="ident">size</span> <span class="op">></span> <span class="number">1</span> { <span class="kw">let</span> <span class="ident">half</span> <span class="op">=</span> <span class="ident">size</span> <span class="op">/</span> <span class="number">2</span>; <span class="kw">let</span> <span class="ident">mid</span> <span class="op">=</span> <span class="ident">base</span> <span class="op">+</span> <span class="ident">half</span>; <span class="comment">// mid is always in [0, size), that means mid is >= 0 and < size.</span> <span class="comment">// mid >= 0: by definition</span> <span class="comment">// mid < size: mid = size / 2 + size / 4 + size / 8 ...</span> <span class="kw">let</span> <span class="ident">cmp</span> <span class="op">=</span> <span class="ident">f</span>(<span class="kw">unsafe</span> { <span class="ident">s</span>.<span class="ident">get_unchecked</span>(<span class="ident">mid</span>) }); <span class="ident">base</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">cmp</span> <span class="op">==</span> <span class="ident">Greater</span> { <span class="ident">base</span> } <span class="kw">else</span> { <span class="ident">mid</span> }; <span class="ident">size</span> <span class="op">-=</span> <span class="ident">half</span>; } <span class="comment">// base is always in [0, size) because base <= mid.</span> <span class="kw">let</span> <span class="ident">cmp</span> <span class="op">=</span> <span class="ident">f</span>(<span class="kw">unsafe</span> { <span class="ident">s</span>.<span class="ident">get_unchecked</span>(<span class="ident">base</span>) }); <span class="kw">if</span> <span class="ident">cmp</span> <span class="op">==</span> <span class="ident">Equal</span> { <span class="prelude-val">Ok</span>(<span class="ident">base</span>) } <span class="kw">else</span> { <span class="prelude-val">Err</span>(<span class="ident">base</span> <span class="op">+</span> (<span class="ident">cmp</span> <span class="op">==</span> <span class="ident">Less</span>) <span class="kw">as</span> <span class="ident">usize</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>::<span class="op"><</span><span class="kw-2">&</span>[<span class="ident">T</span>], <span class="ident">Repr</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>(<span class="self">self</span>).<span class="ident">len</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get_mut</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">I</span>::<span class="ident">Output</span><span class="op">></span> <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="ident">index</span>.<span class="ident">get_mut</span>(<span class="self">self</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">split_at_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">mid</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>(); <span class="kw">unsafe</span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">mid</span> <span class="op"><=</span> <span class="ident">len</span>); (<span class="ident">from_raw_parts_mut</span>(<span class="ident">ptr</span>, <span class="ident">mid</span>), <span class="ident">from_raw_parts_mut</span>(<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">mid</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">len</span> <span class="op">-</span> <span class="ident">mid</span>)) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">iter_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">IterMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">==</span> <span class="number">0</span> { <span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _ } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>(); <span class="ident">assume</span>(<span class="op">!</span><span class="ident">p</span>.<span class="ident">is_null</span>()); <span class="ident">p</span> }; <span class="ident">IterMut</span> { <span class="ident">ptr</span>: <span class="ident">p</span>, <span class="ident">end</span>: <span class="macro">slice_offset</span><span class="macro">!</span>(<span class="ident">p</span>, <span class="self">self</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">_marker</span>: <span class="ident">marker</span>::<span class="ident">PhantomData</span> } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">last_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>]) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">first_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[<span class="number">0</span>]) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">split_first_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>])<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">split_at_mut</span>(<span class="number">1</span>); <span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">split</span>.<span class="number">0</span>[<span class="number">0</span>], <span class="ident">split</span>.<span class="number">1</span>)) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">split_last_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>])<span class="op">></span> { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">split</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">split_at_mut</span>(<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>); <span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">split</span>.<span class="number">1</span>[<span class="number">0</span>], <span class="ident">split</span>.<span class="number">0</span>)) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">split_mut</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">SplitMut</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">SplitMut</span> { <span class="ident">v</span>: <span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">pred</span>, <span class="ident">finished</span>: <span class="bool-val">false</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">rsplit_mut</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">RSplitMut</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">RSplitMut</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">split_mut</span>(<span class="ident">pred</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">splitn_mut</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">SplitNMut</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">SplitNMut</span> { <span class="ident">inner</span>: <span class="ident">GenericSplitN</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">split_mut</span>(<span class="ident">pred</span>), <span class="ident">count</span>: <span class="ident">n</span> } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">rsplitn_mut</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">pred</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="ident">RSplitNMut</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>, { <span class="ident">RSplitNMut</span> { <span class="ident">inner</span>: <span class="ident">GenericSplitN</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">rsplit_mut</span>(<span class="ident">pred</span>), <span class="ident">count</span>: <span class="ident">n</span> } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">chunks_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">chunk_size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">chunk_size</span> <span class="op">!=</span> <span class="number">0</span>); <span class="ident">ChunksMut</span> { <span class="ident">v</span>: <span class="self">self</span>, <span class="ident">chunk_size</span>: <span class="ident">chunk_size</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">exact_chunks_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">chunk_size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ExactChunksMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">chunk_size</span> <span class="op">!=</span> <span class="number">0</span>); <span class="kw">let</span> <span class="ident">rem</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">%</span> <span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">rem</span>; <span class="ident">ExactChunksMut</span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[..<span class="ident">len</span>], <span class="ident">chunk_size</span>: <span class="ident">chunk_size</span>} } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">swap</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">a</span>: <span class="ident">usize</span>, <span class="ident">b</span>: <span class="ident">usize</span>) { <span class="kw">unsafe</span> { <span class="comment">// Can't take two mutable loans from one vector, so instead just cast</span> <span class="comment">// them to their raw pointers to do the swap</span> <span class="kw">let</span> <span class="ident">pa</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[<span class="ident">a</span>]; <span class="kw">let</span> <span class="ident">pb</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[<span class="ident">b</span>]; <span class="ident">ptr</span>::<span class="ident">swap</span>(<span class="ident">pa</span>, <span class="ident">pb</span>); } } <span class="kw">fn</span> <span class="ident">reverse</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">let</span> <span class="ident">ln</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="comment">// For very small types, all the individual reads in the normal</span> <span class="comment">// path perform poorly. We can do better, given efficient unaligned</span> <span class="comment">// load/store, by loading a larger chunk and reversing a register.</span> <span class="comment">// Ideally LLVM would do this for us, as it knows better than we do</span> <span class="comment">// whether unaligned reads are efficient (since that changes between</span> <span class="comment">// different ARM versions, for example) and what the best chunk size</span> <span class="comment">// would be. Unfortunately, as of LLVM 4.0 (2017-05) it only unrolls</span> <span class="comment">// the loop, so we need to do this ourselves. (Hypothesis: reverse</span> <span class="comment">// is troublesome because the sides can be aligned differently --</span> <span class="comment">// will be, when the length is odd -- so there's no way of emitting</span> <span class="comment">// pre- and postludes to use fully-aligned SIMD in the middle.)</span> <span class="kw">let</span> <span class="ident">fast_unaligned</span> <span class="op">=</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86"</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"x86_64"</span>)); <span class="kw">if</span> <span class="ident">fast_unaligned</span> <span class="op">&&</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">==</span> <span class="number">1</span> { <span class="comment">// Use the llvm.bswap intrinsic to reverse u8s in a usize</span> <span class="kw">let</span> <span class="ident">chunk</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>(); <span class="kw">while</span> <span class="ident">i</span> <span class="op">+</span> <span class="ident">chunk</span> <span class="op">-</span> <span class="number">1</span> <span class="op"><</span> <span class="ident">ln</span> <span class="op">/</span> <span class="number">2</span> { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">pa</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">i</span>); <span class="kw">let</span> <span class="ident">pb</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">ln</span> <span class="op">-</span> <span class="ident">i</span> <span class="op">-</span> <span class="ident">chunk</span>); <span class="kw">let</span> <span class="ident">va</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read_unaligned</span>(<span class="ident">pa</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>); <span class="kw">let</span> <span class="ident">vb</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read_unaligned</span>(<span class="ident">pb</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>); <span class="ident">ptr</span>::<span class="ident">write_unaligned</span>(<span class="ident">pa</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>, <span class="ident">vb</span>.<span class="ident">swap_bytes</span>()); <span class="ident">ptr</span>::<span class="ident">write_unaligned</span>(<span class="ident">pb</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">usize</span>, <span class="ident">va</span>.<span class="ident">swap_bytes</span>()); } <span class="ident">i</span> <span class="op">+=</span> <span class="ident">chunk</span>; } } <span class="kw">if</span> <span class="ident">fast_unaligned</span> <span class="op">&&</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">==</span> <span class="number">2</span> { <span class="comment">// Use rotate-by-16 to reverse u16s in a u32</span> <span class="kw">let</span> <span class="ident">chunk</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>() <span class="op">/</span> <span class="number">2</span>; <span class="kw">while</span> <span class="ident">i</span> <span class="op">+</span> <span class="ident">chunk</span> <span class="op">-</span> <span class="number">1</span> <span class="op"><</span> <span class="ident">ln</span> <span class="op">/</span> <span class="number">2</span> { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">pa</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">i</span>); <span class="kw">let</span> <span class="ident">pb</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">ln</span> <span class="op">-</span> <span class="ident">i</span> <span class="op">-</span> <span class="ident">chunk</span>); <span class="kw">let</span> <span class="ident">va</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read_unaligned</span>(<span class="ident">pa</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u32</span>); <span class="kw">let</span> <span class="ident">vb</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read_unaligned</span>(<span class="ident">pb</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u32</span>); <span class="ident">ptr</span>::<span class="ident">write_unaligned</span>(<span class="ident">pa</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u32</span>, <span class="ident">vb</span>.<span class="ident">rotate_left</span>(<span class="number">16</span>)); <span class="ident">ptr</span>::<span class="ident">write_unaligned</span>(<span class="ident">pb</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u32</span>, <span class="ident">va</span>.<span class="ident">rotate_left</span>(<span class="number">16</span>)); } <span class="ident">i</span> <span class="op">+=</span> <span class="ident">chunk</span>; } } <span class="kw">while</span> <span class="ident">i</span> <span class="op"><</span> <span class="ident">ln</span> <span class="op">/</span> <span class="number">2</span> { <span class="comment">// Unsafe swap to avoid the bounds check in safe swap.</span> <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">pa</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">i</span>); <span class="kw">let</span> <span class="ident">pb</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">ln</span> <span class="op">-</span> <span class="ident">i</span> <span class="op">-</span> <span class="number">1</span>); <span class="ident">ptr</span>::<span class="ident">swap</span>(<span class="ident">pa</span>, <span class="ident">pb</span>); } <span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>; } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">I</span>::<span class="ident">Output</span> <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="ident">index</span>.<span class="ident">get_unchecked_mut</span>(<span class="self">self</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">as_mut_ptr</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> [<span class="ident">T</span>] <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">contains</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">PartialEq</span> { <span class="ident">x</span>.<span class="ident">slice_contains</span>(<span class="self">self</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">starts_with</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">needle</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">PartialEq</span> { <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">needle</span>.<span class="ident">len</span>(); <span class="self">self</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="ident">n</span> <span class="op">&&</span> <span class="ident">needle</span> <span class="op">==</span> <span class="kw-2">&</span><span class="self">self</span>[..<span class="ident">n</span>] } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">ends_with</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">needle</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">PartialEq</span> { <span class="kw">let</span> (<span class="ident">m</span>, <span class="ident">n</span>) <span class="op">=</span> (<span class="self">self</span>.<span class="ident">len</span>(), <span class="ident">needle</span>.<span class="ident">len</span>()); <span class="ident">m</span> <span class="op">>=</span> <span class="ident">n</span> <span class="op">&&</span> <span class="ident">needle</span> <span class="op">==</span> <span class="kw-2">&</span><span class="self">self</span>[<span class="ident">m</span><span class="op">-</span><span class="ident">n</span>..] } <span class="kw">fn</span> <span class="ident">binary_search</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">usize</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Ord</span> { <span class="self">self</span>.<span class="ident">binary_search_by</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">p</span>.<span class="ident">cmp</span>(<span class="ident">x</span>)) } <span class="kw">fn</span> <span class="ident">rotate_left</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">mid</span>: <span class="ident">usize</span>) { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">mid</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">len</span>()); <span class="kw">let</span> <span class="ident">k</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">mid</span>; <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>(); <span class="ident">rotate</span>::<span class="ident">ptr_rotate</span>(<span class="ident">mid</span>, <span class="ident">p</span>.<span class="ident">offset</span>(<span class="ident">mid</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">k</span>); } } <span class="kw">fn</span> <span class="ident">rotate_right</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">k</span>: <span class="ident">usize</span>) { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">k</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">len</span>()); <span class="kw">let</span> <span class="ident">mid</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">k</span>; <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>(); <span class="ident">rotate</span>::<span class="ident">ptr_rotate</span>(<span class="ident">mid</span>, <span class="ident">p</span>.<span class="ident">offset</span>(<span class="ident">mid</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">k</span>); } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">clone_from_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">src</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Clone</span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="ident">src</span>.<span class="ident">len</span>(), <span class="string">"destination and source slices have different lengths"</span>); <span class="comment">// NOTE: We need to explicitly slice them to the same length</span> <span class="comment">// for bounds checking to be elided, and the optimizer will</span> <span class="comment">// generate memcpy for simple cases (for example T = u8).</span> <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">src</span>[..<span class="ident">len</span>]; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="self">self</span>[<span class="ident">i</span>].<span class="ident">clone_from</span>(<span class="kw-2">&</span><span class="ident">src</span>[<span class="ident">i</span>]); } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">src</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Copy</span> { <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="ident">src</span>.<span class="ident">len</span>(), <span class="string">"destination and source slices have different lengths"</span>); <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>( <span class="ident">src</span>.<span class="ident">as_ptr</span>(), <span class="self">self</span>.<span class="ident">as_mut_ptr</span>(), <span class="self">self</span>.<span class="ident">len</span>()); } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">swap_with_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">src</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) { <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="ident">src</span>.<span class="ident">len</span>(), <span class="string">"destination and source slices have different lengths"</span>); <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">swap_nonoverlapping</span>( <span class="self">self</span>.<span class="ident">as_mut_ptr</span>(), <span class="ident">src</span>.<span class="ident">as_mut_ptr</span>(), <span class="self">self</span>.<span class="ident">len</span>()); } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">binary_search_by_key</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">B</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">b</span>: <span class="kw-2">&</span><span class="ident">B</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span>, <span class="ident">usize</span><span class="op">></span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">B</span>, <span class="ident">B</span>: <span class="ident">Ord</span> { <span class="self">self</span>.<span class="ident">binary_search_by</span>(<span class="op">|</span><span class="ident">k</span><span class="op">|</span> <span class="ident">f</span>(<span class="ident">k</span>).<span class="ident">cmp</span>(<span class="ident">b</span>)) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">sort_unstable</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="kw">where</span> <span class="self">Self</span>::<span class="ident">Item</span>: <span class="ident">Ord</span> { <span class="ident">sort</span>::<span class="ident">quicksort</span>(<span class="self">self</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span>.<span class="ident">lt</span>(<span class="ident">b</span>)); } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">sort_unstable_by</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">compare</span>: <span class="ident">F</span>) <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">Ordering</span> { <span class="ident">sort</span>::<span class="ident">quicksort</span>(<span class="self">self</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">compare</span>(<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">==</span> <span class="ident">Ordering</span>::<span class="ident">Less</span>); } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">sort_unstable_by_key</span><span class="op"><</span><span class="ident">B</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">B</span>, <span class="ident">B</span>: <span class="ident">Ord</span> { <span class="ident">sort</span>::<span class="ident">quicksort</span>(<span class="self">self</span>, <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">f</span>(<span class="ident">a</span>).<span class="ident">lt</span>(<span class="kw-2">&</span><span class="ident">f</span>(<span class="ident">b</span>))); } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="attribute">#[<span class="ident">rustc_on_unimplemented</span> <span class="op">=</span> <span class="string">"slice indices are of type `usize` or ranges of `usize`"</span>]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span><span class="op">></span> <span class="ident">ops</span>::<span class="ident">Index</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="kw">for</span> [<span class="ident">T</span>] <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">I</span>::<span class="ident">Output</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">I</span>::<span class="ident">Output</span> { <span class="ident">index</span>.<span class="ident">index</span>(<span class="self">self</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="attribute">#[<span class="ident">rustc_on_unimplemented</span> <span class="op">=</span> <span class="string">"slice indices are of type `usize` or ranges of `usize`"</span>]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span><span class="op">></span> <span class="ident">ops</span>::<span class="ident">IndexMut</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="kw">for</span> [<span class="ident">T</span>] <span class="kw">where</span> <span class="ident">I</span>: <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">I</span>::<span class="ident">Output</span> { <span class="ident">index</span>.<span class="ident">index_mut</span>(<span class="self">self</span>) } } <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span> <span class="attribute">#[<span class="ident">cold</span>]</span> <span class="kw">fn</span> <span class="ident">slice_index_len_fail</span>(<span class="ident">index</span>: <span class="ident">usize</span>, <span class="ident">len</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="op">!</span> { <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"index {} out of range for slice of length {}"</span>, <span class="ident">index</span>, <span class="ident">len</span>); } <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span> <span class="attribute">#[<span class="ident">cold</span>]</span> <span class="kw">fn</span> <span class="ident">slice_index_order_fail</span>(<span class="ident">index</span>: <span class="ident">usize</span>, <span class="ident">end</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="op">!</span> { <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"slice index starts at {} but ends at {}"</span>, <span class="ident">index</span>, <span class="ident">end</span>); } <span class="doccomment">/// A helper trait used for indexing operations.</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_get_slice"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35729"</span>)]</span> <span class="attribute">#[<span class="ident">rustc_on_unimplemented</span> <span class="op">=</span> <span class="string">"slice indices are of type `usize` or ranges of `usize`"</span>]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">SliceIndex</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> { <span class="doccomment">/// The output type returned by methods.</span> <span class="kw">type</span> <span class="ident">Output</span>: <span class="question-mark">?</span><span class="ident">Sized</span>; <span class="doccomment">/// Returns a shared reference to the output at this location, if in</span> <span class="doccomment">/// bounds.</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Output</span><span class="op">></span>; <span class="doccomment">/// Returns a mutable reference to the output at this location, if in</span> <span class="doccomment">/// bounds.</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Output</span><span class="op">></span>; <span class="doccomment">/// Returns a shared reference to the output at this location, without</span> <span class="doccomment">/// performing any bounds checking.</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Output</span>; <span class="doccomment">/// Returns a mutable reference to the output at this location, without</span> <span class="doccomment">/// performing any bounds checking.</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Output</span>; <span class="doccomment">/// Returns a shared reference to the output at this location, panicking</span> <span class="doccomment">/// if out of bounds.</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="self">Self</span>::<span class="ident">Output</span>; <span class="doccomment">/// Returns a mutable reference to the output at this location, panicking</span> <span class="doccomment">/// if out of bounds.</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>::<span class="ident">Output</span>; } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice-get-slice-impls"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">usize</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">T</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span> <span class="op"><</span> <span class="ident">slice</span>.<span class="ident">len</span>() { <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">get_unchecked</span>(<span class="ident">slice</span>)) } } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span> <span class="op"><</span> <span class="ident">slice</span>.<span class="ident">len</span>() { <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">slice</span>)) } } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">T</span> { <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">slice</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span> <span class="kw">as</span> <span class="ident">isize</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">slice</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span> <span class="kw">as</span> <span class="ident">isize</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">T</span> { <span class="comment">// NB: use intrinsic indexing</span> <span class="kw-2">&</span>(<span class="kw-2">*</span><span class="ident">slice</span>)[<span class="self">self</span>] } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="comment">// NB: use intrinsic indexing</span> <span class="kw-2">&</span><span class="kw-2">mut</span> (<span class="kw-2">*</span><span class="ident">slice</span>)[<span class="self">self</span>] } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice-get-slice-impls"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">ops</span>::<span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">start</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">||</span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">></span> <span class="ident">slice</span>.<span class="ident">len</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">get_unchecked</span>(<span class="ident">slice</span>)) } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">start</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">||</span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">></span> <span class="ident">slice</span>.<span class="ident">len</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">slice</span>)) } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="ident">from_raw_parts</span>(<span class="ident">slice</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="self">self</span>.<span class="ident">end</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">start</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="ident">from_raw_parts_mut</span>(<span class="ident">slice</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="self">self</span>.<span class="ident">end</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">start</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">start</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">end</span> { <span class="ident">slice_index_order_fail</span>(<span class="self">self</span>.<span class="ident">start</span>, <span class="self">self</span>.<span class="ident">end</span>); } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">></span> <span class="ident">slice</span>.<span class="ident">len</span>() { <span class="ident">slice_index_len_fail</span>(<span class="self">self</span>.<span class="ident">end</span>, <span class="ident">slice</span>.<span class="ident">len</span>()); } <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">get_unchecked</span>(<span class="ident">slice</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">start</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">end</span> { <span class="ident">slice_index_order_fail</span>(<span class="self">self</span>.<span class="ident">start</span>, <span class="self">self</span>.<span class="ident">end</span>); } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">></span> <span class="ident">slice</span>.<span class="ident">len</span>() { <span class="ident">slice_index_len_fail</span>(<span class="self">self</span>.<span class="ident">end</span>, <span class="ident">slice</span>.<span class="ident">len</span>()); } <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">slice</span>) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice-get-slice-impls"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">ops</span>::<span class="ident">RangeTo</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">T</span>]<span class="op">></span> { (<span class="number">0</span>..<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { (<span class="number">0</span>..<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get_mut</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { (<span class="number">0</span>..<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get_unchecked</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { (<span class="number">0</span>..<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get_unchecked_mut</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { (<span class="number">0</span>..<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">index</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { (<span class="number">0</span>..<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">index_mut</span>(<span class="ident">slice</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice-get-slice-impls"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">ops</span>::<span class="ident">RangeFrom</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">T</span>]<span class="op">></span> { (<span class="self">self</span>.<span class="ident">start</span>..<span class="ident">slice</span>.<span class="ident">len</span>()).<span class="ident">get</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { (<span class="self">self</span>.<span class="ident">start</span>..<span class="ident">slice</span>.<span class="ident">len</span>()).<span class="ident">get_mut</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { (<span class="self">self</span>.<span class="ident">start</span>..<span class="ident">slice</span>.<span class="ident">len</span>()).<span class="ident">get_unchecked</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { (<span class="self">self</span>.<span class="ident">start</span>..<span class="ident">slice</span>.<span class="ident">len</span>()).<span class="ident">get_unchecked_mut</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { (<span class="self">self</span>.<span class="ident">start</span>..<span class="ident">slice</span>.<span class="ident">len</span>()).<span class="ident">index</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { (<span class="self">self</span>.<span class="ident">start</span>..<span class="ident">slice</span>.<span class="ident">len</span>()).<span class="ident">index_mut</span>(<span class="ident">slice</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice-get-slice-impls"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">ops</span>::<span class="ident">RangeFull</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="prelude-val">Some</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="prelude-val">Some</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="ident">slice</span> } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="ident">slice</span> } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="ident">slice</span> } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="ident">slice</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"inclusive_range"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added, follows RFC"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"28237"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">ops</span>::<span class="ident">RangeInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">==</span> <span class="ident">usize</span>::<span class="ident">max_value</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { (<span class="self">self</span>.<span class="ident">start</span>..<span class="self">self</span>.<span class="ident">end</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">get</span>(<span class="ident">slice</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">==</span> <span class="ident">usize</span>::<span class="ident">max_value</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { (<span class="self">self</span>.<span class="ident">start</span>..<span class="self">self</span>.<span class="ident">end</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">get_mut</span>(<span class="ident">slice</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { (<span class="self">self</span>.<span class="ident">start</span>..<span class="self">self</span>.<span class="ident">end</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">get_unchecked</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { (<span class="self">self</span>.<span class="ident">start</span>..<span class="self">self</span>.<span class="ident">end</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">get_unchecked_mut</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">end</span> <span class="op">!=</span> <span class="ident">usize</span>::<span class="ident">max_value</span>(), <span class="string">"attempted to index slice up to maximum usize"</span>); (<span class="self">self</span>.<span class="ident">start</span>..<span class="self">self</span>.<span class="ident">end</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">index</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">end</span> <span class="op">!=</span> <span class="ident">usize</span>::<span class="ident">max_value</span>(), <span class="string">"attempted to index slice up to maximum usize"</span>); (<span class="self">self</span>.<span class="ident">start</span>..<span class="self">self</span>.<span class="ident">end</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">index_mut</span>(<span class="ident">slice</span>) } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"inclusive_range"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added, follows RFC"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"28237"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceIndex</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">ops</span>::<span class="ident">RangeToInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">T</span>]<span class="op">></span> { (<span class="number">0</span>..=<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { (<span class="number">0</span>..=<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get_mut</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { (<span class="number">0</span>..=<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get_unchecked</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { (<span class="number">0</span>..=<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get_unchecked_mut</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { (<span class="number">0</span>..=<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">index</span>(<span class="ident">slice</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="self">self</span>, <span class="ident">slice</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { (<span class="number">0</span>..=<span class="self">self</span>.<span class="ident">end</span>).<span class="ident">index_mut</span>(<span class="ident">slice</span>) } } <span class="comment">////////////////////////////////////////////////////////////////////////////////</span> <span class="comment">// Common traits</span> <span class="comment">////////////////////////////////////////////////////////////////////////////////</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="doccomment">/// Creates an empty slice.</span> <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="kw-2">&</span>[] } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mut_slice_default"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="doccomment">/// Creates a mutable empty slice.</span> <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="kw-2">&</span><span class="kw-2">mut</span> [] } } <span class="comment">//</span> <span class="comment">// Iterators</span> <span class="comment">//</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter_mut</span>() } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_from_ptr</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(_: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() } <span class="comment">// The shared definition of the `Iter` and `IterMut` iterators</span> <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">iterator</span> { (<span class="kw">struct</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span> <span class="op">-></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ptr</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>:<span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span>:<span class="ident">ident</span>) <span class="op">=></span> { <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span><span class="op">></span> { <span class="comment">// could be implemented with slices, but this avoids bounds checks</span> <span class="kw">unsafe</span> { <span class="kw">if</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">!=</span> <span class="number">0</span> { <span class="ident">assume</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">is_null</span>()); <span class="ident">assume</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">end</span>.<span class="ident">is_null</span>()); } <span class="kw">if</span> <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">end</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">post_inc</span>())) } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> <span class="ident">exact</span> <span class="op">=</span> <span class="ident">ptrdistance</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>); (<span class="ident">exact</span>, <span class="prelude-val">Some</span>(<span class="ident">exact</span>)) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">len</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span><span class="op">></span> { <span class="comment">// Call helper method. Can't put the definition here because mut versus const.</span> <span class="self">self</span>.<span class="ident">iter_nth</span>(<span class="ident">n</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">next_back</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">try_fold</span><span class="op"><</span><span class="ident">B</span>, <span class="ident">F</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">init</span>: <span class="ident">B</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">R</span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>, <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">B</span>, <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">R</span>, <span class="ident">R</span>: <span class="ident">Try</span><span class="op"><</span><span class="prelude-val">Ok</span><span class="op">=</span><span class="ident">B</span><span class="op">></span> { <span class="comment">// manual unrolling is needed when there are conditional exits from the loop</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">accum</span> <span class="op">=</span> <span class="ident">init</span>; <span class="kw">unsafe</span> { <span class="kw">while</span> <span class="ident">ptrdistance</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>) <span class="op">>=</span> <span class="number">4</span> { <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">post_inc</span>()))<span class="question-mark">?</span>; <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">post_inc</span>()))<span class="question-mark">?</span>; <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">post_inc</span>()))<span class="question-mark">?</span>; <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">post_inc</span>()))<span class="question-mark">?</span>; } <span class="kw">while</span> <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">!=</span> <span class="self">self</span>.<span class="ident">end</span> { <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">post_inc</span>()))<span class="question-mark">?</span>; } } <span class="ident">Try</span>::<span class="ident">from_ok</span>(<span class="ident">accum</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">fold</span><span class="op"><</span><span class="ident">Acc</span>, <span class="ident">Fold</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">init</span>: <span class="ident">Acc</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">Fold</span>) <span class="op">-></span> <span class="ident">Acc</span> <span class="kw">where</span> <span class="ident">Fold</span>: <span class="ident">FnMut</span>(<span class="ident">Acc</span>, <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">Acc</span>, { <span class="comment">// Let LLVM unroll this, rather than using the default</span> <span class="comment">// impl that would force the manual unrolling above</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">accum</span> <span class="op">=</span> <span class="ident">init</span>; <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">next</span>() { <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="ident">x</span>); } <span class="ident">accum</span> } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">rustc_inherit_overflow_checks</span>]</span> <span class="kw">fn</span> <span class="ident">position</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">predicate</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>, <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>, { <span class="comment">// The addition might panic on overflow</span> <span class="comment">// Use the len of the slice to hint optimizer to remove result index bounds check.</span> <span class="kw">let</span> <span class="ident">_n</span> <span class="op">=</span> <span class="macro">make_slice</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>).<span class="ident">len</span>(); <span class="self">self</span>.<span class="ident">try_fold</span>(<span class="number">0</span>, <span class="kw">move</span> <span class="op">|</span><span class="ident">i</span>, <span class="ident">x</span><span class="op">|</span> { <span class="kw">if</span> <span class="ident">predicate</span>(<span class="ident">x</span>) { <span class="prelude-val">Err</span>(<span class="ident">i</span>) } <span class="kw">else</span> { <span class="prelude-val">Ok</span>(<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>) } }).<span class="ident">err</span>() <span class="comment">// // FIXME(#48116/#45964):</span> <span class="comment">// // This assume() causes misoptimization on LLVM 6.</span> <span class="comment">// // Commented out until it is fixed again.</span> <span class="comment">// .map(|i| {</span> <span class="comment">// unsafe { assume(i < n) };</span> <span class="comment">// i</span> <span class="comment">// })</span> } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">rposition</span><span class="op"><</span><span class="ident">P</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">predicate</span>: <span class="ident">P</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">bool</span>, <span class="self">Self</span>: <span class="ident">Sized</span> <span class="op">+</span> <span class="ident">ExactSizeIterator</span> <span class="op">+</span> <span class="ident">DoubleEndedIterator</span> { <span class="comment">// No need for an overflow check here, because `ExactSizeIterator`</span> <span class="comment">// implies that the number of elements fits into a `usize`.</span> <span class="comment">// Use the len of the slice to hint optimizer to remove result index bounds check.</span> <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="macro">make_slice</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>).<span class="ident">len</span>(); <span class="self">self</span>.<span class="ident">try_rfold</span>(<span class="ident">n</span>, <span class="kw">move</span> <span class="op">|</span><span class="ident">i</span>, <span class="ident">x</span><span class="op">|</span> { <span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">-</span> <span class="number">1</span>; <span class="kw">if</span> <span class="ident">predicate</span>(<span class="ident">x</span>) { <span class="prelude-val">Err</span>(<span class="ident">i</span>) } <span class="kw">else</span> { <span class="prelude-val">Ok</span>(<span class="ident">i</span>) } }).<span class="ident">err</span>() <span class="comment">// // FIXME(#48116/#45964):</span> <span class="comment">// // This assume() causes misoptimization on LLVM 6.</span> <span class="comment">// // Commented out until it is fixed again.</span> <span class="comment">// .map(|i| {</span> <span class="comment">// unsafe { assume(i < n) };</span> <span class="comment">// i</span> <span class="comment">// })</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span><span class="op">></span> { <span class="comment">// could be implemented with slices, but this avoids bounds checks</span> <span class="kw">unsafe</span> { <span class="kw">if</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">!=</span> <span class="number">0</span> { <span class="ident">assume</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">is_null</span>()); <span class="ident">assume</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">end</span>.<span class="ident">is_null</span>()); } <span class="kw">if</span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">ptr</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">end</span>.<span class="ident">pre_dec</span>())) } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">try_rfold</span><span class="op"><</span><span class="ident">B</span>, <span class="ident">F</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">init</span>: <span class="ident">B</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">R</span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span>, <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">B</span>, <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">R</span>, <span class="ident">R</span>: <span class="ident">Try</span><span class="op"><</span><span class="prelude-val">Ok</span><span class="op">=</span><span class="ident">B</span><span class="op">></span> { <span class="comment">// manual unrolling is needed when there are conditional exits from the loop</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">accum</span> <span class="op">=</span> <span class="ident">init</span>; <span class="kw">unsafe</span> { <span class="kw">while</span> <span class="ident">ptrdistance</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>) <span class="op">>=</span> <span class="number">4</span> { <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">end</span>.<span class="ident">pre_dec</span>()))<span class="question-mark">?</span>; <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">end</span>.<span class="ident">pre_dec</span>()))<span class="question-mark">?</span>; <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">end</span>.<span class="ident">pre_dec</span>()))<span class="question-mark">?</span>; <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">end</span>.<span class="ident">pre_dec</span>()))<span class="question-mark">?</span>; } <span class="kw">while</span> <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">!=</span> <span class="self">self</span>.<span class="ident">end</span> { <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">mkref</span><span class="op">!</span>(<span class="self">self</span>.<span class="ident">end</span>.<span class="ident">pre_dec</span>()))<span class="question-mark">?</span>; } } <span class="ident">Try</span>::<span class="ident">from_ok</span>(<span class="ident">accum</span>) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">rfold</span><span class="op"><</span><span class="ident">Acc</span>, <span class="ident">Fold</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">init</span>: <span class="ident">Acc</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">Fold</span>) <span class="op">-></span> <span class="ident">Acc</span> <span class="kw">where</span> <span class="ident">Fold</span>: <span class="ident">FnMut</span>(<span class="ident">Acc</span>, <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">Acc</span>, { <span class="comment">// Let LLVM unroll this, rather than using the default</span> <span class="comment">// impl that would force the manual unrolling above</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">accum</span> <span class="op">=</span> <span class="ident">init</span>; <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">next_back</span>() { <span class="ident">accum</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">accum</span>, <span class="ident">x</span>); } <span class="ident">accum</span> } } } } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">make_slice</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">start</span>: <span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>: <span class="ident">expr</span>) <span class="op">=></span> {{ <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">start</span>; <span class="kw">let</span> <span class="ident">diff</span> <span class="op">=</span> (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">wrapping_sub</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span>); <span class="kw">if</span> <span class="ident">size_from_ptr</span>(<span class="ident">start</span>) <span class="op">==</span> <span class="number">0</span> { <span class="comment">// use a non-null pointer value</span> <span class="kw">unsafe</span> { <span class="ident">from_raw_parts</span>(<span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _, <span class="ident">diff</span>) } } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">diff</span> <span class="op">/</span> <span class="ident">size_from_ptr</span>(<span class="ident">start</span>); <span class="kw">unsafe</span> { <span class="ident">from_raw_parts</span>(<span class="ident">start</span>, <span class="ident">len</span>) } } }} } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">make_mut_slice</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">start</span>: <span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>: <span class="ident">expr</span>) <span class="op">=></span> {{ <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">start</span>; <span class="kw">let</span> <span class="ident">diff</span> <span class="op">=</span> (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">wrapping_sub</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span>); <span class="kw">if</span> <span class="ident">size_from_ptr</span>(<span class="ident">start</span>) <span class="op">==</span> <span class="number">0</span> { <span class="comment">// use a non-null pointer value</span> <span class="kw">unsafe</span> { <span class="ident">from_raw_parts_mut</span>(<span class="number">1</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _, <span class="ident">diff</span>) } } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">diff</span> <span class="op">/</span> <span class="ident">size_from_ptr</span>(<span class="ident">start</span>); <span class="kw">unsafe</span> { <span class="ident">from_raw_parts_mut</span>(<span class="ident">start</span>, <span class="ident">len</span>) } } }} } <span class="doccomment">/// Immutable slice iterator</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`iter`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// // First, we declare a type which has `iter` method to get the `Iter` struct (&[usize here]):</span> <span class="doccomment">/// let slice = &[1, 2, 3];</span> <span class="doccomment">///</span> <span class="doccomment">/// // Then, we iterate over it:</span> <span class="doccomment">/// for element in slice.iter() {</span> <span class="doccomment">/// println!("{}", element);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// [`iter`]: ../../std/primitive.slice.html#method.iter</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">end</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">_marker</span>: <span class="ident">marker</span>::<span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Iter"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">as_slice</span>()) .<span class="ident">finish</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// View the underlying data as a subslice of the original data.</span> <span class="doccomment">///</span> <span class="doccomment">/// This has the same lifetime as the original slice, and so the</span> <span class="doccomment">/// iterator can continue to be used while this exists.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// // First, we declare a type which has the `iter` method to get the `Iter`</span> <span class="doccomment">/// // struct (&[usize here]):</span> <span class="doccomment">/// let slice = &[1, 2, 3];</span> <span class="doccomment">///</span> <span class="doccomment">/// // Then, we get the iterator:</span> <span class="doccomment">/// let mut iter = slice.iter();</span> <span class="doccomment">/// // So if we print what `as_slice` method returns here, we have "[1, 2, 3]":</span> <span class="doccomment">/// println!("{:?}", iter.as_slice());</span> <span class="doccomment">///</span> <span class="doccomment">/// // Next, we move to the second element of the slice:</span> <span class="doccomment">/// iter.next();</span> <span class="doccomment">/// // Now `as_slice` returns "[2, 3]":</span> <span class="doccomment">/// println!("{:?}", iter.as_slice());</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"iter_to_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_slice</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="macro">make_slice</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>) } <span class="comment">// Helper function for Iter::nth</span> <span class="kw">fn</span> <span class="ident">iter_nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">match</span> <span class="self">self</span>.<span class="ident">as_slice</span>().<span class="ident">get</span>(<span class="ident">n</span>) { <span class="prelude-val">Some</span>(<span class="ident">elem_ref</span>) <span class="op">=></span> <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">=</span> <span class="macro">slice_offset</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>, (<span class="ident">n</span> <span class="kw">as</span> <span class="ident">isize</span>).<span class="ident">wrapping_add</span>(<span class="number">1</span>)); <span class="prelude-val">Some</span>(<span class="ident">elem_ref</span>) }, <span class="prelude-val">None</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">end</span>; <span class="prelude-val">None</span> } } } } <span class="macro">iterator</span><span class="macro">!</span>{<span class="kw">struct</span> <span class="ident">Iter</span> <span class="op">-></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>, <span class="ident">make_ref</span>} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">end</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"trusted_len"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"37572"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedLen</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Iter</span> { <span class="ident">ptr</span>: <span class="self">self</span>.<span class="ident">ptr</span>, <span class="ident">end</span>: <span class="self">self</span>.<span class="ident">end</span>, <span class="ident">_marker</span>: <span class="self">self</span>.<span class="ident">_marker</span> } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_iter_as_ref"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="self">self</span>.<span class="ident">as_slice</span>() } } <span class="doccomment">/// Mutable slice iterator.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`iter_mut`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// // First, we declare a type which has `iter_mut` method to get the `IterMut`</span> <span class="doccomment">/// // struct (&[usize here]):</span> <span class="doccomment">/// let mut slice = &mut [1, 2, 3];</span> <span class="doccomment">///</span> <span class="doccomment">/// // Then, we iterate over it and increment each element value:</span> <span class="doccomment">/// for element in slice.iter_mut() {</span> <span class="doccomment">/// *element += 1;</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // We now have "[2, 3, 4]":</span> <span class="doccomment">/// println!("{:?}", slice);</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// [`iter_mut`]: ../../std/primitive.slice.html#method.iter_mut</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">end</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">_marker</span>: <span class="ident">marker</span>::<span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"IterMut"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="macro">make_slice</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>)) .<span class="ident">finish</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// View the underlying data as a subslice of the original data.</span> <span class="doccomment">///</span> <span class="doccomment">/// To avoid creating `&mut` references that alias, this is forced</span> <span class="doccomment">/// to consume the iterator. Consider using the `Slice` and</span> <span class="doccomment">/// `SliceMut` implementations for obtaining slices with more</span> <span class="doccomment">/// restricted lifetimes that do not consume the iterator.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// // First, we declare a type which has `iter_mut` method to get the `IterMut`</span> <span class="doccomment">/// // struct (&[usize here]):</span> <span class="doccomment">/// let mut slice = &mut [1, 2, 3];</span> <span class="doccomment">///</span> <span class="doccomment">/// {</span> <span class="doccomment">/// // Then, we get the iterator:</span> <span class="doccomment">/// let mut iter = slice.iter_mut();</span> <span class="doccomment">/// // We move to next element:</span> <span class="doccomment">/// iter.next();</span> <span class="doccomment">/// // So if we print what `into_slice` method returns here, we have "[2, 3]":</span> <span class="doccomment">/// println!("{:?}", iter.into_slice());</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // Now let's modify a value of the slice:</span> <span class="doccomment">/// {</span> <span class="doccomment">/// // First we get back the iterator:</span> <span class="doccomment">/// let mut iter = slice.iter_mut();</span> <span class="doccomment">/// // We change the value of the first element of the slice returned by the `next` method:</span> <span class="doccomment">/// *iter.next().unwrap() += 1;</span> <span class="doccomment">/// }</span> <span class="doccomment">/// // Now slice is "[2, 2, 3]":</span> <span class="doccomment">/// println!("{:?}", slice);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"iter_to_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_slice</span>(<span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="macro">make_mut_slice</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>) } <span class="comment">// Helper function for IterMut::nth</span> <span class="kw">fn</span> <span class="ident">iter_nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">match</span> <span class="macro">make_mut_slice</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">end</span>).<span class="ident">get_mut</span>(<span class="ident">n</span>) { <span class="prelude-val">Some</span>(<span class="ident">elem_ref</span>) <span class="op">=></span> <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">=</span> <span class="macro">slice_offset</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">ptr</span>, (<span class="ident">n</span> <span class="kw">as</span> <span class="ident">isize</span>).<span class="ident">wrapping_add</span>(<span class="number">1</span>)); <span class="prelude-val">Some</span>(<span class="ident">elem_ref</span>) }, <span class="prelude-val">None</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">end</span>; <span class="prelude-val">None</span> } } } } <span class="macro">iterator</span><span class="macro">!</span>{<span class="kw">struct</span> <span class="ident">IterMut</span> <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">make_ref_mut</span>} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">ptr</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">end</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"trusted_len"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"37572"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedLen</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="comment">// Return the number of elements of `T` from `start` to `end`.</span> <span class="comment">// Return the arithmetic difference if `T` is zero size.</span> <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="kw">fn</span> <span class="ident">ptrdistance</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">start</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">end</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="kw">match</span> <span class="ident">start</span>.<span class="ident">offset_to</span>(<span class="ident">end</span>) { <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="prelude-val">None</span> <span class="op">=></span> (<span class="ident">end</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">wrapping_sub</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">usize</span>), } } <span class="comment">// Extension methods for raw pointers, used by the iterators</span> <span class="kw">trait</span> <span class="ident">PointerExt</span> : <span class="ident">Copy</span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">slice_offset</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="self">Self</span>; <span class="doccomment">/// Increments `self` by 1, but returns the old value.</span> <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">post_inc</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw">let</span> <span class="ident">current</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>; <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">slice_offset</span>(<span class="number">1</span>); <span class="ident">current</span> } <span class="doccomment">/// Decrements `self` by 1, and returns the new value.</span> <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">pre_dec</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">slice_offset</span>(<span class="op">-</span><span class="number">1</span>); <span class="kw-2">*</span><span class="self">self</span> } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">PointerExt</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> { <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">slice_offset</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="macro">slice_offset</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">i</span>) } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">PointerExt</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">slice_offset</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">isize</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="macro">slice_offset</span><span class="macro">!</span>(<span class="self">self</span>, <span class="ident">i</span>) } } <span class="doccomment">/// An internal abstraction over the splitting iterators, so that</span> <span class="doccomment">/// splitn, splitn_mut etc can be implemented once.</span> <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">trait</span> <span class="ident">SplitIter</span>: <span class="ident">DoubleEndedIterator</span> { <span class="doccomment">/// Marks the underlying iterator as complete, extracting the remaining</span> <span class="doccomment">/// portion of the slice.</span> <span class="kw">fn</span> <span class="ident">finish</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>; } <span class="doccomment">/// An iterator over subslices separated by elements that match a predicate</span> <span class="doccomment">/// function.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`split`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`split`]: ../../std/primitive.slice.html#method.split</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>], <span class="ident">pred</span>: <span class="ident">P</span>, <span class="ident">finished</span>: <span class="ident">bool</span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Split"</span>) .<span class="ident">field</span>(<span class="string">"v"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>) .<span class="ident">field</span>(<span class="string">"finished"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">finished</span>) .<span class="ident">finish</span>() } } <span class="comment">// FIXME(#26925) Remove in favor of `#[derive(Clone)]`</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> { <span class="ident">Split</span> { <span class="ident">v</span>: <span class="self">self</span>.<span class="ident">v</span>, <span class="ident">pred</span>: <span class="self">self</span>.<span class="ident">pred</span>.<span class="ident">clone</span>(), <span class="ident">finished</span>: <span class="self">self</span>.<span class="ident">finished</span>, } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">finished</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">match</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> (<span class="self">self</span>.<span class="ident">pred</span>)(<span class="ident">x</span>)) { <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">finish</span>(), <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[..<span class="ident">idx</span>]); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>..]; <span class="ident">ret</span> } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">finished</span> { (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="number">0</span>)) } <span class="kw">else</span> { (<span class="number">1</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>)) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">finished</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">match</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">rposition</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> (<span class="self">self</span>.<span class="ident">pred</span>)(<span class="ident">x</span>)) { <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">finish</span>(), <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>..]); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[..<span class="ident">idx</span>]; <span class="ident">ret</span> } } } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">SplitIter</span> <span class="kw">for</span> <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">finish</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">finished</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">finished</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">v</span>) } } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {} <span class="doccomment">/// An iterator over the subslices of the vector which are separated</span> <span class="doccomment">/// by elements that match `pred`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`split_mut`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`split_mut`]: ../../std/primitive.slice.html#method.split_mut</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="ident">pred</span>: <span class="ident">P</span>, <span class="ident">finished</span>: <span class="ident">bool</span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">SplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"SplitMut"</span>) .<span class="ident">field</span>(<span class="string">"v"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>) .<span class="ident">field</span>(<span class="string">"finished"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">finished</span>) .<span class="ident">finish</span>() } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">SplitIter</span> <span class="kw">for</span> <span class="ident">SplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">finish</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">finished</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">finished</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="prelude-val">Some</span>(<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> [])) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">SplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">finished</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">let</span> <span class="ident">idx_opt</span> <span class="op">=</span> { <span class="comment">// work around borrowck limitations</span> <span class="kw">let</span> <span class="ident">pred</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">pred</span>; <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> (<span class="kw-2">*</span><span class="ident">pred</span>)(<span class="ident">x</span>)) }; <span class="kw">match</span> <span class="ident">idx_opt</span> { <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">finish</span>(), <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> []); <span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="ident">idx</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">tail</span>[<span class="number">1</span>..]; <span class="prelude-val">Some</span>(<span class="ident">head</span>) } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">finished</span> { (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="number">0</span>)) } <span class="kw">else</span> { <span class="comment">// if the predicate doesn't match anything, we yield one slice</span> <span class="comment">// if it matches every element, we yield len+1 empty slices.</span> (<span class="number">1</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>)) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">SplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>, { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">finished</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">let</span> <span class="ident">idx_opt</span> <span class="op">=</span> { <span class="comment">// work around borrowck limitations</span> <span class="kw">let</span> <span class="ident">pred</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">pred</span>; <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">rposition</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> (<span class="kw-2">*</span><span class="ident">pred</span>)(<span class="ident">x</span>)) }; <span class="kw">match</span> <span class="ident">idx_opt</span> { <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">finish</span>(), <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> []); <span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="ident">idx</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">head</span>; <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">tail</span>[<span class="number">1</span>..]) } } } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">SplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {} <span class="doccomment">/// An iterator over subslices separated by elements that match a predicate</span> <span class="doccomment">/// function, starting from the end of the slice.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`rsplit`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`rsplit`]: ../../std/primitive.slice.html#method.rsplit</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span> <span class="comment">// Is this correct, or does it incorrectly require `T: Clone`?</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RSplit</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">inner</span>: <span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">RSplit</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"RSplit"</span>) .<span class="ident">field</span>(<span class="string">"v"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">v</span>) .<span class="ident">field</span>(<span class="string">"finished"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">finished</span>) .<span class="ident">finish</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">RSplit</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">size_hint</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">RSplit</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">SplitIter</span> <span class="kw">for</span> <span class="ident">RSplit</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">finish</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">finish</span>() } } <span class="comment">//#[unstable(feature = "fused", issue = "35602")]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">RSplit</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {} <span class="doccomment">/// An iterator over the subslices of the vector which are separated</span> <span class="doccomment">/// by elements that match `pred`, starting from the end of the slice.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`rsplit_mut`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`rsplit_mut`]: ../../std/primitive.slice.html#method.rsplit_mut</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RSplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">inner</span>: <span class="ident">SplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">RSplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"RSplitMut"</span>) .<span class="ident">field</span>(<span class="string">"v"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">v</span>) .<span class="ident">field</span>(<span class="string">"finished"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">finished</span>) .<span class="ident">finish</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">SplitIter</span> <span class="kw">for</span> <span class="ident">RSplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">finish</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">finish</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">RSplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">size_hint</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">RSplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>, { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>() } } <span class="comment">//#[unstable(feature = "fused", issue = "35602")]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"slice_rsplit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41020"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">RSplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {} <span class="doccomment">/// An private iterator over subslices separated by elements that</span> <span class="doccomment">/// match a predicate function, splitting at most a fixed number of</span> <span class="doccomment">/// times.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">struct</span> <span class="ident">GenericSplitN</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> { <span class="ident">iter</span>: <span class="ident">I</span>, <span class="ident">count</span>: <span class="ident">usize</span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span>: <span class="ident">SplitIter</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">T</span><span class="op">>></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">GenericSplitN</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">match</span> <span class="self">self</span>.<span class="ident">count</span> { <span class="number">0</span> <span class="op">=></span> <span class="prelude-val">None</span>, <span class="number">1</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">count</span> <span class="op">-=</span> <span class="number">1</span>; <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">finish</span>() } _ <span class="op">=></span> { <span class="self">self</span>.<span class="ident">count</span> <span class="op">-=</span> <span class="number">1</span>; <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>() } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> (<span class="ident">lower</span>, <span class="ident">upper_opt</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>(); (<span class="ident">lower</span>, <span class="ident">upper_opt</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">upper</span><span class="op">|</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">count</span>, <span class="ident">upper</span>))) } } <span class="doccomment">/// An iterator over subslices separated by elements that match a predicate</span> <span class="doccomment">/// function, limited to a given number of splits.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`splitn`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`splitn`]: ../../std/primitive.slice.html#method.splitn</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SplitN</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">inner</span>: <span class="ident">GenericSplitN</span><span class="op"><</span><span class="ident">Split</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">>></span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">SplitN</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"SplitN"</span>) .<span class="ident">field</span>(<span class="string">"inner"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>) .<span class="ident">finish</span>() } } <span class="doccomment">/// An iterator over subslices separated by elements that match a</span> <span class="doccomment">/// predicate function, limited to a given number of splits, starting</span> <span class="doccomment">/// from the end of the slice.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`rsplitn`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`rsplitn`]: ../../std/primitive.slice.html#method.rsplitn</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RSplitN</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">inner</span>: <span class="ident">GenericSplitN</span><span class="op"><</span><span class="ident">RSplit</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">>></span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">RSplitN</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"RSplitN"</span>) .<span class="ident">field</span>(<span class="string">"inner"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>) .<span class="ident">finish</span>() } } <span class="doccomment">/// An iterator over subslices separated by elements that match a predicate</span> <span class="doccomment">/// function, limited to a given number of splits.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`splitn_mut`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`splitn_mut`]: ../../std/primitive.slice.html#method.splitn_mut</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SplitNMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">inner</span>: <span class="ident">GenericSplitN</span><span class="op"><</span><span class="ident">SplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">>></span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">SplitNMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"SplitNMut"</span>) .<span class="ident">field</span>(<span class="string">"inner"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>) .<span class="ident">finish</span>() } } <span class="doccomment">/// An iterator over subslices separated by elements that match a</span> <span class="doccomment">/// predicate function, limited to a given number of splits, starting</span> <span class="doccomment">/// from the end of the slice.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`rsplitn_mut`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`rsplitn_mut`]: ../../std/primitive.slice.html#method.rsplitn_mut</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RSplitNMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">inner</span>: <span class="ident">GenericSplitN</span><span class="op"><</span><span class="ident">RSplitMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">>></span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">RSplitNMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"RSplitNMut"</span>) .<span class="ident">field</span>(<span class="string">"inner"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>) .<span class="ident">finish</span>() } } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">forward_iterator</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter_of</span>:<span class="ident">ty</span>) <span class="op">=></span> { <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter_of</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">iter_of</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">size_hint</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>, <span class="ident">P</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">elem</span>, <span class="ident">P</span><span class="op">></span> <span class="kw">where</span> <span class="ident">P</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {} } } <span class="macro">forward_iterator</span><span class="macro">!</span> { <span class="ident">SplitN</span>: <span class="ident">T</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] } <span class="macro">forward_iterator</span><span class="macro">!</span> { <span class="ident">RSplitN</span>: <span class="ident">T</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] } <span class="macro">forward_iterator</span><span class="macro">!</span> { <span class="ident">SplitNMut</span>: <span class="ident">T</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] } <span class="macro">forward_iterator</span><span class="macro">!</span> { <span class="ident">RSplitNMut</span>: <span class="ident">T</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] } <span class="doccomment">/// An iterator over overlapping subslices of length `size`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`windows`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`windows`]: ../../std/primitive.slice.html#method.windows</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Windows</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span><span class="op">></span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>], <span class="ident">size</span>: <span class="ident">usize</span> } <span class="comment">// FIXME(#26925) Remove in favor of `#[derive(Clone)]`</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Windows</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Windows</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Windows</span> { <span class="ident">v</span>: <span class="self">self</span>.<span class="ident">v</span>, <span class="ident">size</span>: <span class="self">self</span>.<span class="ident">size</span>, } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Windows</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">size</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[..<span class="self">self</span>.<span class="ident">size</span>]); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="number">1</span>..]; <span class="ident">ret</span> } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">size</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() { (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="number">0</span>)) } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">size</span> <span class="op">+</span> <span class="number">1</span>; (<span class="ident">size</span>, <span class="prelude-val">Some</span>(<span class="ident">size</span>)) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">len</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> { <span class="kw">let</span> (<span class="ident">end</span>, <span class="ident">overflow</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">size</span>.<span class="ident">overflowing_add</span>(<span class="ident">n</span>); <span class="kw">if</span> <span class="ident">end</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="ident">overflow</span> { <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span>[]; <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">nth</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="ident">n</span>..<span class="ident">end</span>]; <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="ident">n</span><span class="op">+</span><span class="number">1</span>..]; <span class="prelude-val">Some</span>(<span class="ident">nth</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">size</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">size</span>; <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="ident">start</span>..]) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Windows</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">size</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>()<span class="op">-</span><span class="self">self</span>.<span class="ident">size</span>..]); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[..<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>()<span class="op">-</span><span class="number">1</span>]; <span class="ident">ret</span> } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Windows</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Windows</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedRandomAccess</span> <span class="kw">for</span> <span class="ident">Windows</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="ident">from_raw_parts</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="self">self</span>.<span class="ident">size</span>) } <span class="kw">fn</span> <span class="ident">may_have_side_effect</span>() <span class="op">-></span> <span class="ident">bool</span> { <span class="bool-val">false</span> } } <span class="doccomment">/// An iterator over a slice in (non-overlapping) chunks (`chunk_size` elements at a</span> <span class="doccomment">/// time).</span> <span class="doccomment">///</span> <span class="doccomment">/// When the slice len is not evenly divided by the chunk size, the last slice</span> <span class="doccomment">/// of the iteration will be the remainder.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`chunks`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`chunks`]: ../../std/primitive.slice.html#method.chunks</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Chunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span><span class="op">></span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>], <span class="ident">chunk_size</span>: <span class="ident">usize</span> } <span class="comment">// FIXME(#26925) Remove in favor of `#[derive(Clone)]`</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Chunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Chunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Chunks</span> { <span class="ident">v</span>: <span class="self">self</span>.<span class="ident">v</span>, <span class="ident">chunk_size</span>: <span class="self">self</span>.<span class="ident">chunk_size</span>, } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Chunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">chunksz</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>(), <span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="kw">let</span> (<span class="ident">fst</span>, <span class="ident">snd</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">split_at</span>(<span class="ident">chunksz</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">snd</span>; <span class="prelude-val">Some</span>(<span class="ident">fst</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() { (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="number">0</span>)) } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">/</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">rem</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">%</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">rem</span> <span class="op">></span> <span class="number">0</span> { <span class="ident">n</span><span class="op">+</span><span class="number">1</span> } <span class="kw">else</span> { <span class="ident">n</span> }; (<span class="ident">n</span>, <span class="prelude-val">Some</span>(<span class="ident">n</span>)) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">len</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> { <span class="kw">let</span> (<span class="ident">start</span>, <span class="ident">overflow</span>) <span class="op">=</span> <span class="ident">n</span>.<span class="ident">overflowing_mul</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="kw">if</span> <span class="ident">start</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="ident">overflow</span> { <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span>[]; <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">start</span>.<span class="ident">checked_add</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>) { <span class="prelude-val">Some</span>(<span class="ident">sum</span>) <span class="op">=></span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>(), <span class="ident">sum</span>), <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>(), }; <span class="kw">let</span> <span class="ident">nth</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="ident">start</span>..<span class="ident">end</span>]; <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="ident">end</span>..]; <span class="prelude-val">Some</span>(<span class="ident">nth</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>) <span class="op">/</span> <span class="self">self</span>.<span class="ident">chunk_size</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">v</span>[<span class="ident">start</span>..]) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Chunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">remainder</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">%</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">chunksz</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">remainder</span> <span class="op">!=</span> <span class="number">0</span> { <span class="ident">remainder</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">chunk_size</span> }; <span class="kw">let</span> (<span class="ident">fst</span>, <span class="ident">snd</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">split_at</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">chunksz</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">fst</span>; <span class="prelude-val">Some</span>(<span class="ident">snd</span>) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Chunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Chunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedRandomAccess</span> <span class="kw">for</span> <span class="ident">Chunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">start</span>.<span class="ident">checked_add</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>) { <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="ident">end</span>) <span class="op">=></span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">end</span>, <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>()), }; <span class="ident">from_raw_parts</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">end</span> <span class="op">-</span> <span class="ident">start</span>) } <span class="kw">fn</span> <span class="ident">may_have_side_effect</span>() <span class="op">-></span> <span class="ident">bool</span> { <span class="bool-val">false</span> } } <span class="doccomment">/// An iterator over a slice in (non-overlapping) mutable chunks (`chunk_size`</span> <span class="doccomment">/// elements at a time). When the slice len is not evenly divided by the chunk</span> <span class="doccomment">/// size, the last slice of the iteration will be the remainder.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`chunks_mut`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`chunks_mut`]: ../../std/primitive.slice.html#method.chunks_mut</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span><span class="op">></span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="ident">chunk_size</span>: <span class="ident">usize</span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">sz</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>(), <span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> []); <span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="ident">sz</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">tail</span>; <span class="prelude-val">Some</span>(<span class="ident">head</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() { (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="number">0</span>)) } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">/</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">rem</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">%</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">rem</span> <span class="op">></span> <span class="number">0</span> { <span class="ident">n</span> <span class="op">+</span> <span class="number">1</span> } <span class="kw">else</span> { <span class="ident">n</span> }; (<span class="ident">n</span>, <span class="prelude-val">Some</span>(<span class="ident">n</span>)) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">len</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">let</span> (<span class="ident">start</span>, <span class="ident">overflow</span>) <span class="op">=</span> <span class="ident">n</span>.<span class="ident">overflowing_mul</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="kw">if</span> <span class="ident">start</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="ident">overflow</span> { <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> []; <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">start</span>.<span class="ident">checked_add</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>) { <span class="prelude-val">Some</span>(<span class="ident">sum</span>) <span class="op">=></span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>(), <span class="ident">sum</span>), <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>(), }; <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> []); <span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="ident">end</span>); <span class="kw">let</span> (_, <span class="ident">nth</span>) <span class="op">=</span> <span class="ident">head</span>.<span class="ident">split_at_mut</span>(<span class="ident">start</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">tail</span>; <span class="prelude-val">Some</span>(<span class="ident">nth</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>) <span class="op">/</span> <span class="self">self</span>.<span class="ident">chunk_size</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>[<span class="ident">start</span>..]) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">remainder</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">%</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">sz</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">remainder</span> <span class="op">!=</span> <span class="number">0</span> { <span class="ident">remainder</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">chunk_size</span> }; <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> []); <span class="kw">let</span> <span class="ident">tmp_len</span> <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">len</span>(); <span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="ident">tmp_len</span> <span class="op">-</span> <span class="ident">sz</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">head</span>; <span class="prelude-val">Some</span>(<span class="ident">tail</span>) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedRandomAccess</span> <span class="kw">for</span> <span class="ident">ChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">start</span>.<span class="ident">checked_add</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>) { <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>(), <span class="prelude-val">Some</span>(<span class="ident">end</span>) <span class="op">=></span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">end</span>, <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>()), }; <span class="ident">from_raw_parts_mut</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">end</span> <span class="op">-</span> <span class="ident">start</span>) } <span class="kw">fn</span> <span class="ident">may_have_side_effect</span>() <span class="op">-></span> <span class="ident">bool</span> { <span class="bool-val">false</span> } } <span class="doccomment">/// An iterator over a slice in (non-overlapping) chunks (`chunk_size` elements at a</span> <span class="doccomment">/// time).</span> <span class="doccomment">///</span> <span class="doccomment">/// When the slice len is not evenly divided by the chunk size, the last</span> <span class="doccomment">/// up to `chunk_size-1` elements will be omitted.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`exact_chunks`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`exact_chunks`]: ../../std/primitive.slice.html#method.exact_chunks</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span><span class="op">></span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>], <span class="ident">chunk_size</span>: <span class="ident">usize</span> } <span class="comment">// FIXME(#26925) Remove in favor of `#[derive(Clone)]`</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">ExactChunks</span> { <span class="ident">v</span>: <span class="self">self</span>.<span class="ident">v</span>, <span class="ident">chunk_size</span>: <span class="self">self</span>.<span class="ident">chunk_size</span>, } } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="self">self</span>.<span class="ident">chunk_size</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> (<span class="ident">fst</span>, <span class="ident">snd</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">split_at</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">snd</span>; <span class="prelude-val">Some</span>(<span class="ident">fst</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">/</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; (<span class="ident">n</span>, <span class="prelude-val">Some</span>(<span class="ident">n</span>)) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">len</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> { <span class="kw">let</span> (<span class="ident">start</span>, <span class="ident">overflow</span>) <span class="op">=</span> <span class="ident">n</span>.<span class="ident">overflowing_mul</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="kw">if</span> <span class="ident">start</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="ident">overflow</span> { <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span>[]; <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> (_, <span class="ident">snd</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">split_at</span>(<span class="ident">start</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">snd</span>; <span class="self">self</span>.<span class="ident">next</span>() } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">next_back</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="self">self</span>.<span class="ident">chunk_size</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> (<span class="ident">fst</span>, <span class="ident">snd</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">split_at</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">fst</span>; <span class="prelude-val">Some</span>(<span class="ident">snd</span>) } } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedRandomAccess</span> <span class="kw">for</span> <span class="ident">ExactChunks</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="ident">from_raw_parts</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="self">self</span>.<span class="ident">chunk_size</span>) } <span class="kw">fn</span> <span class="ident">may_have_side_effect</span>() <span class="op">-></span> <span class="ident">bool</span> { <span class="bool-val">false</span> } } <span class="doccomment">/// An iterator over a slice in (non-overlapping) mutable chunks (`chunk_size`</span> <span class="doccomment">/// elements at a time). When the slice len is not evenly divided by the chunk</span> <span class="doccomment">/// size, the last up to `chunk_size-1` elements will be omitted.</span> <span class="doccomment">///</span> <span class="doccomment">/// This struct is created by the [`exact_chunks_mut`] method on [slices].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`exact_chunks_mut`]: ../../std/primitive.slice.html#method.exact_chunks_mut</span> <span class="doccomment">/// [slices]: ../../std/primitive.slice.html</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ExactChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>:<span class="lifetime">'a</span><span class="op">></span> { <span class="ident">v</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="ident">chunk_size</span>: <span class="ident">usize</span> } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">ExactChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="self">self</span>.<span class="ident">chunk_size</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> []); <span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">tail</span>; <span class="prelude-val">Some</span>(<span class="ident">head</span>) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">/</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; (<span class="ident">n</span>, <span class="prelude-val">Some</span>(<span class="ident">n</span>)) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="self">self</span>.<span class="ident">len</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">nth</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">let</span> (<span class="ident">start</span>, <span class="ident">overflow</span>) <span class="op">=</span> <span class="ident">n</span>.<span class="ident">overflowing_mul</span>(<span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="kw">if</span> <span class="ident">start</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="ident">overflow</span> { <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> []; <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> []); <span class="kw">let</span> (_, <span class="ident">snd</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="ident">start</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">snd</span>; <span class="self">self</span>.<span class="ident">next</span>() } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">last</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">next_back</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">ExactChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="self">self</span>.<span class="ident">chunk_size</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> []); <span class="kw">let</span> <span class="ident">tmp_len</span> <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">len</span>(); <span class="kw">let</span> (<span class="ident">head</span>, <span class="ident">tail</span>) <span class="op">=</span> <span class="ident">tmp</span>.<span class="ident">split_at_mut</span>(<span class="ident">tmp_len</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">chunk_size</span>); <span class="self">self</span>.<span class="ident">v</span> <span class="op">=</span> <span class="ident">head</span>; <span class="prelude-val">Some</span>(<span class="ident">tail</span>) } } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"exact_chunks"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47115"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">ExactChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">v</span>.<span class="ident">is_empty</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">ExactChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedRandomAccess</span> <span class="kw">for</span> <span class="ident">ExactChunksMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">*</span> <span class="self">self</span>.<span class="ident">chunk_size</span>; <span class="ident">from_raw_parts_mut</span>(<span class="self">self</span>.<span class="ident">v</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="self">self</span>.<span class="ident">chunk_size</span>) } <span class="kw">fn</span> <span class="ident">may_have_side_effect</span>() <span class="op">-></span> <span class="ident">bool</span> { <span class="bool-val">false</span> } } <span class="comment">//</span> <span class="comment">// Free functions</span> <span class="comment">//</span> <span class="doccomment">/// Forms a slice from a pointer and a length.</span> <span class="doccomment">///</span> <span class="doccomment">/// The `len` argument is the number of **elements**, not the number of bytes.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Safety</span> <span class="doccomment">///</span> <span class="doccomment">/// This function is unsafe as there is no guarantee that the given pointer is</span> <span class="doccomment">/// valid for `len` elements, nor whether the lifetime inferred is a suitable</span> <span class="doccomment">/// lifetime for the returned slice.</span> <span class="doccomment">///</span> <span class="doccomment">/// `p` must be non-null, even for zero-length slices, because non-zero bits</span> <span class="doccomment">/// are required to distinguish between a zero-length slice within `Some()`</span> <span class="doccomment">/// from `None`. `p` can be a bogus non-dereferencable pointer, such as `0x1`,</span> <span class="doccomment">/// for zero-length slices, though.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Caveat</span> <span class="doccomment">///</span> <span class="doccomment">/// The lifetime for the returned slice is inferred from its usage. To</span> <span class="doccomment">/// prevent accidental misuse, it's suggested to tie the lifetime to whichever</span> <span class="doccomment">/// source lifetime is safe in the context, such as by providing a helper</span> <span class="doccomment">/// function taking the lifetime of a host value for the slice, or by explicit</span> <span class="doccomment">/// annotation.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::slice;</span> <span class="doccomment">///</span> <span class="doccomment">/// // manifest a slice out of thin air!</span> <span class="doccomment">/// let ptr = 0x1234 as *const usize;</span> <span class="doccomment">/// let amt = 10;</span> <span class="doccomment">/// unsafe {</span> <span class="doccomment">/// let slice = slice::from_raw_parts(ptr, amt);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw_parts</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>(<span class="ident">p</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="ident">len</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">Repr</span> { <span class="ident">data</span>: <span class="ident">p</span>, <span class="ident">len</span>: <span class="ident">len</span> }) } <span class="doccomment">/// Performs the same functionality as `from_raw_parts`, except that a mutable</span> <span class="doccomment">/// slice is returned.</span> <span class="doccomment">///</span> <span class="doccomment">/// This function is unsafe for the same reasons as `from_raw_parts`, as well</span> <span class="doccomment">/// as not being able to provide a non-aliasing guarantee of the returned</span> <span class="doccomment">/// mutable slice. `p` must be non-null even for zero-length slices as with</span> <span class="doccomment">/// `from_raw_parts`.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw_parts_mut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>(<span class="ident">p</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">len</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">Repr</span> { <span class="ident">data</span>: <span class="ident">p</span>, <span class="ident">len</span>: <span class="ident">len</span> }) } <span class="doccomment">/// Converts a reference to T into a slice of length 1 (without copying).</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"from_ref"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"45703"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_ref</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="kw">unsafe</span> { <span class="ident">from_raw_parts</span>(<span class="ident">s</span>, <span class="number">1</span>) } } <span class="doccomment">/// Converts a reference to T into a slice of length 1 (without copying).</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"from_ref"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"45703"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_ref_mut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="kw">unsafe</span> { <span class="ident">from_raw_parts_mut</span>(<span class="ident">s</span>, <span class="number">1</span>) } } <span class="comment">// This function is public only because there is no other way to unit test heapsort.</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"sort_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to sort module"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">heapsort</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>(<span class="ident">v</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="kw-2">mut</span> <span class="ident">is_less</span>: <span class="ident">F</span>) <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>, <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">sort</span>::<span class="ident">heapsort</span>(<span class="ident">v</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">is_less</span>); } <span class="comment">//</span> <span class="comment">// Comparison traits</span> <span class="comment">//</span> <span class="kw">extern</span> { <span class="doccomment">/// Calls implementation provided memcmp.</span> <span class="doccomment">///</span> <span class="doccomment">/// Interprets the data as u8.</span> <span class="doccomment">///</span> <span class="doccomment">/// Returns 0 for equal, < 0 for less than and > 0 for greater</span> <span class="doccomment">/// than.</span> <span class="comment">// FIXME(#32610): Return type should be c_int</span> <span class="kw">fn</span> <span class="ident">memcmp</span>(<span class="ident">s1</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>, <span class="ident">s2</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">i32</span>; } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">PartialEq</span><span class="op"><</span>[<span class="ident">B</span>]<span class="op">></span> <span class="kw">for</span> [<span class="ident">A</span>] <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">B</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">SlicePartialEq</span>::<span class="ident">equal</span>(<span class="self">self</span>, <span class="ident">other</span>) } <span class="kw">fn</span> <span class="ident">ne</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">B</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">SlicePartialEq</span>::<span class="ident">not_equal</span>(<span class="self">self</span>, <span class="ident">other</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Eq</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> [<span class="ident">T</span>] {} <span class="doccomment">/// Implements comparison of vectors lexicographically.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> [<span class="ident">T</span>] { <span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">Ordering</span> { <span class="ident">SliceOrd</span>::<span class="ident">compare</span>(<span class="self">self</span>, <span class="ident">other</span>) } } <span class="doccomment">/// Implements comparison of vectors lexicographically.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">PartialOrd</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> [<span class="ident">T</span>] { <span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> { <span class="ident">SlicePartialOrd</span>::<span class="ident">partial_compare</span>(<span class="self">self</span>, <span class="ident">other</span>) } } <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="comment">// intermediate trait for specialization of slice's PartialEq</span> <span class="kw">trait</span> <span class="ident">SlicePartialEq</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">equal</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">B</span>]) <span class="op">-></span> <span class="ident">bool</span>; <span class="kw">fn</span> <span class="ident">not_equal</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">B</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="op">!</span><span class="self">self</span>.<span class="ident">equal</span>(<span class="ident">other</span>) } } <span class="comment">// Generic slice equality</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">SlicePartialEq</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> <span class="kw">for</span> [<span class="ident">A</span>] <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> { <span class="ident">default</span> <span class="kw">fn</span> <span class="ident">equal</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">B</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="ident">other</span>.<span class="ident">len</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; } <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="self">self</span>.<span class="ident">len</span>() { <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>[<span class="ident">i</span>].<span class="ident">eq</span>(<span class="kw-2">&</span><span class="ident">other</span>[<span class="ident">i</span>]) { <span class="kw">return</span> <span class="bool-val">false</span>; } } <span class="bool-val">true</span> } } <span class="comment">// Use memcmp for bytewise equality when the types allow</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">SlicePartialEq</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> [<span class="ident">A</span>] <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="op">+</span> <span class="ident">BytewiseEquality</span> { <span class="kw">fn</span> <span class="ident">equal</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">A</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="ident">other</span>.<span class="ident">len</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; } <span class="kw">if</span> <span class="self">self</span>.<span class="ident">as_ptr</span>() <span class="op">==</span> <span class="ident">other</span>.<span class="ident">as_ptr</span>() { <span class="kw">return</span> <span class="bool-val">true</span>; } <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of_val</span>(<span class="self">self</span>); <span class="ident">memcmp</span>(<span class="self">self</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>, <span class="ident">other</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>, <span class="ident">size</span>) <span class="op">==</span> <span class="number">0</span> } } } <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="comment">// intermediate trait for specialization of slice's PartialOrd</span> <span class="kw">trait</span> <span class="ident">SlicePartialOrd</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">partial_compare</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">B</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span>; } <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">SlicePartialOrd</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> [<span class="ident">A</span>] <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">PartialOrd</span> { <span class="ident">default</span> <span class="kw">fn</span> <span class="ident">partial_compare</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">A</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">l</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">len</span>(), <span class="ident">other</span>.<span class="ident">len</span>()); <span class="comment">// Slice to the loop iteration range to enable bound check</span> <span class="comment">// elimination in the compiler</span> <span class="kw">let</span> <span class="ident">lhs</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>[..<span class="ident">l</span>]; <span class="kw">let</span> <span class="ident">rhs</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">other</span>[..<span class="ident">l</span>]; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">l</span> { <span class="kw">match</span> <span class="ident">lhs</span>[<span class="ident">i</span>].<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="ident">rhs</span>[<span class="ident">i</span>]) { <span class="prelude-val">Some</span>(<span class="ident">Ordering</span>::<span class="ident">Equal</span>) <span class="op">=></span> (), <span class="ident">non_eq</span> <span class="op">=></span> <span class="kw">return</span> <span class="ident">non_eq</span>, } } <span class="self">self</span>.<span class="ident">len</span>().<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">len</span>()) } } <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">SlicePartialOrd</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> [<span class="ident">A</span>] <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Ord</span> { <span class="ident">default</span> <span class="kw">fn</span> <span class="ident">partial_compare</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">A</span>]) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> { <span class="prelude-val">Some</span>(<span class="ident">SliceOrd</span>::<span class="ident">compare</span>(<span class="self">self</span>, <span class="ident">other</span>)) } } <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="comment">// intermediate trait for specialization of slice's Ord</span> <span class="kw">trait</span> <span class="ident">SliceOrd</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">compare</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">B</span>]) <span class="op">-></span> <span class="ident">Ordering</span>; } <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">SliceOrd</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> [<span class="ident">A</span>] <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Ord</span> { <span class="ident">default</span> <span class="kw">fn</span> <span class="ident">compare</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">A</span>]) <span class="op">-></span> <span class="ident">Ordering</span> { <span class="kw">let</span> <span class="ident">l</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">len</span>(), <span class="ident">other</span>.<span class="ident">len</span>()); <span class="comment">// Slice to the loop iteration range to enable bound check</span> <span class="comment">// elimination in the compiler</span> <span class="kw">let</span> <span class="ident">lhs</span> <span class="op">=</span> <span class="kw-2">&</span><span class="self">self</span>[..<span class="ident">l</span>]; <span class="kw">let</span> <span class="ident">rhs</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">other</span>[..<span class="ident">l</span>]; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">l</span> { <span class="kw">match</span> <span class="ident">lhs</span>[<span class="ident">i</span>].<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">rhs</span>[<span class="ident">i</span>]) { <span class="ident">Ordering</span>::<span class="ident">Equal</span> <span class="op">=></span> (), <span class="ident">non_eq</span> <span class="op">=></span> <span class="kw">return</span> <span class="ident">non_eq</span>, } } <span class="self">self</span>.<span class="ident">len</span>().<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">len</span>()) } } <span class="comment">// memcmp compares a sequence of unsigned bytes lexicographically.</span> <span class="comment">// this matches the order we want for [u8], but no others (not even [i8]).</span> <span class="kw">impl</span> <span class="ident">SliceOrd</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> <span class="kw">for</span> [<span class="ident">u8</span>] { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">compare</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">Ordering</span> { <span class="kw">let</span> <span class="ident">order</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">memcmp</span>(<span class="self">self</span>.<span class="ident">as_ptr</span>(), <span class="ident">other</span>.<span class="ident">as_ptr</span>(), <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">len</span>(), <span class="ident">other</span>.<span class="ident">len</span>())) }; <span class="kw">if</span> <span class="ident">order</span> <span class="op">==</span> <span class="number">0</span> { <span class="self">self</span>.<span class="ident">len</span>().<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">len</span>()) } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">order</span> <span class="op"><</span> <span class="number">0</span> { <span class="ident">Less</span> } <span class="kw">else</span> { <span class="ident">Greater</span> } } } <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="doccomment">/// Trait implemented for types that can be compared for equality using</span> <span class="doccomment">/// their bytewise representation</span> <span class="kw">trait</span> <span class="ident">BytewiseEquality</span> { } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">impl_marker_for</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">traitname</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ty</span>)<span class="kw-2">*</span>) <span class="op">=></span> { $( <span class="kw">impl</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">traitname</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> { } )<span class="op">*</span> } } <span class="macro">impl_marker_for</span><span class="macro">!</span>(<span class="ident">BytewiseEquality</span>, <span class="ident">u8</span> <span class="ident">i8</span> <span class="ident">u16</span> <span class="ident">i16</span> <span class="ident">u32</span> <span class="ident">i32</span> <span class="ident">u64</span> <span class="ident">i64</span> <span class="ident">usize</span> <span class="ident">isize</span> <span class="ident">char</span> <span class="ident">bool</span>); <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedRandomAccess</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span> { <span class="kw-2">&</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>) } <span class="kw">fn</span> <span class="ident">may_have_side_effect</span>() <span class="op">-></span> <span class="ident">bool</span> { <span class="bool-val">false</span> } } <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">TrustedRandomAccess</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_unchecked</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>) } <span class="kw">fn</span> <span class="ident">may_have_side_effect</span>() <span class="op">-></span> <span class="ident">bool</span> { <span class="bool-val">false</span> } } <span class="kw">trait</span> <span class="ident">SliceContains</span>: <span class="ident">Sized</span> { <span class="kw">fn</span> <span class="ident">slice_contains</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span>[<span class="self">Self</span>]) <span class="op">-></span> <span class="ident">bool</span>; } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SliceContains</span> <span class="kw">for</span> <span class="ident">T</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">PartialEq</span> { <span class="ident">default</span> <span class="kw">fn</span> <span class="ident">slice_contains</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span>[<span class="self">Self</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">x</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">y</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">y</span> <span class="op">==</span> <span class="kw-2">*</span><span class="self">self</span>) } } <span class="kw">impl</span> <span class="ident">SliceContains</span> <span class="kw">for</span> <span class="ident">u8</span> { <span class="kw">fn</span> <span class="ident">slice_contains</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span>[<span class="self">Self</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="ident">memchr</span>::<span class="ident">memchr</span>(<span class="kw-2">*</span><span class="self">self</span>, <span class="ident">x</span>).<span class="ident">is_some</span>() } } <span class="kw">impl</span> <span class="ident">SliceContains</span> <span class="kw">for</span> <span class="ident">i8</span> { <span class="kw">fn</span> <span class="ident">slice_contains</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span>[<span class="self">Self</span>]) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">let</span> <span class="ident">byte</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">u8</span>; <span class="kw">let</span> <span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">from_raw_parts</span>(<span class="ident">x</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">u8</span>, <span class="ident">x</span>.<span class="ident">len</span>()) }; <span class="ident">memchr</span>::<span class="ident">memchr</span>(<span class="ident">byte</span>, <span class="ident">bytes</span>).<span class="ident">is_some</span>() } } </pre> </section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt><kbd>?</kbd></dt> <dd>Show this help dialog</dd> <dt><kbd>S</kbd></dt> <dd>Focus the search field</dd> <dt><kbd>↑</kbd></dt> <dd>Move up in search results</dd> <dt><kbd>↓</kbd></dt> <dd>Move down in search 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