<!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 `liballoc/btree/map.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>map.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="../../../light.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='../../../alloc/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"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></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"> 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id="719"> 719</span> <span id="720"> 720</span> <span id="721"> 721</span> <span 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 id="1297">1297</span> <span id="1298">1298</span> <span id="1299">1299</span> <span id="1300">1300</span> <span id="1301">1301</span> <span id="1302">1302</span> <span id="1303">1303</span> <span id="1304">1304</span> <span id="1305">1305</span> <span id="1306">1306</span> <span id="1307">1307</span> <span id="1308">1308</span> <span id="1309">1309</span> <span id="1310">1310</span> <span id="1311">1311</span> <span id="1312">1312</span> <span id="1313">1313</span> <span id="1314">1314</span> <span id="1315">1315</span> <span id="1316">1316</span> <span id="1317">1317</span> <span id="1318">1318</span> <span id="1319">1319</span> <span id="1320">1320</span> <span id="1321">1321</span> <span id="1322">1322</span> <span id="1323">1323</span> <span id="1324">1324</span> <span id="1325">1325</span> <span id="1326">1326</span> <span id="1327">1327</span> <span id="1328">1328</span> <span 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id="1924">1924</span> <span id="1925">1925</span> <span id="1926">1926</span> <span 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 id="1962">1962</span> <span id="1963">1963</span> <span id="1964">1964</span> <span id="1965">1965</span> <span id="1966">1966</span> <span id="1967">1967</span> <span id="1968">1968</span> <span id="1969">1969</span> <span id="1970">1970</span> <span id="1971">1971</span> <span id="1972">1972</span> <span id="1973">1973</span> <span id="1974">1974</span> <span id="1975">1975</span> <span id="1976">1976</span> <span id="1977">1977</span> <span id="1978">1978</span> <span id="1979">1979</span> <span id="1980">1980</span> <span id="1981">1981</span> <span id="1982">1982</span> <span id="1983">1983</span> <span id="1984">1984</span> <span id="1985">1985</span> <span id="1986">1986</span> <span id="1987">1987</span> <span id="1988">1988</span> <span id="1989">1989</span> <span id="1990">1990</span> <span id="1991">1991</span> <span id="1992">1992</span> <span id="1993">1993</span> <span id="1994">1994</span> <span id="1995">1995</span> <span id="1996">1996</span> <span 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 id="2067">2067</span> <span id="2068">2068</span> <span id="2069">2069</span> <span id="2070">2070</span> <span id="2071">2071</span> <span id="2072">2072</span> <span id="2073">2073</span> <span id="2074">2074</span> <span id="2075">2075</span> <span id="2076">2076</span> <span id="2077">2077</span> <span id="2078">2078</span> <span id="2079">2079</span> <span id="2080">2080</span> <span id="2081">2081</span> <span id="2082">2082</span> <span id="2083">2083</span> <span id="2084">2084</span> <span id="2085">2085</span> <span id="2086">2086</span> <span id="2087">2087</span> <span id="2088">2088</span> <span id="2089">2089</span> <span id="2090">2090</span> <span id="2091">2091</span> <span id="2092">2092</span> <span id="2093">2093</span> <span id="2094">2094</span> <span id="2095">2095</span> <span id="2096">2096</span> <span id="2097">2097</span> <span id="2098">2098</span> <span 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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="kw">use</span> <span class="ident">core</span>::<span class="ident">cmp</span>::<span class="ident">Ordering</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>::<span class="ident">Debug</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">hash</span>::{<span class="ident">Hash</span>, <span class="ident">Hasher</span>}; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>::{<span class="ident">FromIterator</span>, <span class="ident">Peekable</span>, <span class="ident">FusedIterator</span>}; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::<span class="ident">Bound</span>::{<span class="ident">Excluded</span>, <span class="ident">Included</span>, <span class="ident">Unbounded</span>}; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::<span class="ident">Index</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::<span class="ident">RangeBounds</span>; <span class="kw">use</span> <span class="ident">core</span>::{<span class="ident">fmt</span>, <span class="ident">intrinsics</span>, <span class="ident">mem</span>, <span class="ident">ptr</span>}; <span class="kw">use</span> <span class="ident">borrow</span>::<span class="ident">Borrow</span>; <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">node</span>::{<span class="self">self</span>, <span class="ident">Handle</span>, <span class="ident">NodeRef</span>, <span class="ident">marker</span>}; <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">search</span>; <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">node</span>::<span class="ident">InsertResult</span>::<span class="kw-2">*</span>; <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">node</span>::<span class="ident">ForceResult</span>::<span class="kw-2">*</span>; <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">search</span>::<span class="ident">SearchResult</span>::<span class="kw-2">*</span>; <span class="kw">use</span> <span class="self">self</span>::<span class="ident">UnderflowResult</span>::<span class="kw-2">*</span>; <span class="kw">use</span> <span class="self">self</span>::<span class="ident">Entry</span>::<span class="kw-2">*</span>; <span class="doccomment">/// A map based on a B-Tree.</span> <span class="doccomment">///</span> <span class="doccomment">/// B-Trees represent a fundamental compromise between cache-efficiency and actually minimizing</span> <span class="doccomment">/// the amount of work performed in a search. In theory, a binary search tree (BST) is the optimal</span> <span class="doccomment">/// choice for a sorted map, as a perfectly balanced BST performs the theoretical minimum amount of</span> <span class="doccomment">/// comparisons necessary to find an element (log<sub>2</sub>n). However, in practice the way this</span> <span class="doccomment">/// is done is *very* inefficient for modern computer architectures. In particular, every element</span> <span class="doccomment">/// is stored in its own individually heap-allocated node. This means that every single insertion</span> <span class="doccomment">/// triggers a heap-allocation, and every single comparison should be a cache-miss. Since these</span> <span class="doccomment">/// are both notably expensive things to do in practice, we are forced to at very least reconsider</span> <span class="doccomment">/// the BST strategy.</span> <span class="doccomment">///</span> <span class="doccomment">/// A B-Tree instead makes each node contain B-1 to 2B-1 elements in a contiguous array. By doing</span> <span class="doccomment">/// this, we reduce the number of allocations by a factor of B, and improve cache efficiency in</span> <span class="doccomment">/// searches. However, this does mean that searches will have to do *more* comparisons on average.</span> <span class="doccomment">/// The precise number of comparisons depends on the node search strategy used. For optimal cache</span> <span class="doccomment">/// efficiency, one could search the nodes linearly. For optimal comparisons, one could search</span> <span class="doccomment">/// the node using binary search. As a compromise, one could also perform a linear search</span> <span class="doccomment">/// that initially only checks every i<sup>th</sup> element for some choice of i.</span> <span class="doccomment">///</span> <span class="doccomment">/// Currently, our implementation simply performs naive linear search. This provides excellent</span> <span class="doccomment">/// performance on *small* nodes of elements which are cheap to compare. However in the future we</span> <span class="doccomment">/// would like to further explore choosing the optimal search strategy based on the choice of B,</span> <span class="doccomment">/// and possibly other factors. Using linear search, searching for a random element is expected</span> <span class="doccomment">/// to take O(B log<sub>B</sub>n) comparisons, which is generally worse than a BST. In practice,</span> <span class="doccomment">/// however, performance is excellent.</span> <span class="doccomment">///</span> <span class="doccomment">/// It is a logic error for a key to be modified in such a way that the key's ordering relative to</span> <span class="doccomment">/// any other key, as determined by the [`Ord`] trait, changes while it is in the map. This is</span> <span class="doccomment">/// normally only possible through [`Cell`], [`RefCell`], global state, I/O, or unsafe code.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`Ord`]: ../../std/cmp/trait.Ord.html</span> <span class="doccomment">/// [`Cell`]: ../../std/cell/struct.Cell.html</span> <span class="doccomment">/// [`RefCell`]: ../../std/cell/struct.RefCell.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// // type inference lets us omit an explicit type signature (which</span> <span class="doccomment">/// // would be `BTreeMap<&str, &str>` in this example).</span> <span class="doccomment">/// let mut movie_reviews = BTreeMap::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// // review some movies.</span> <span class="doccomment">/// movie_reviews.insert("Office Space", "Deals with real issues in the workplace.");</span> <span class="doccomment">/// movie_reviews.insert("Pulp Fiction", "Masterpiece.");</span> <span class="doccomment">/// movie_reviews.insert("The Godfather", "Very enjoyable.");</span> <span class="doccomment">/// movie_reviews.insert("The Blues Brothers", "Eye lyked it alot.");</span> <span class="doccomment">///</span> <span class="doccomment">/// // check for a specific one.</span> <span class="doccomment">/// if !movie_reviews.contains_key("Les Misérables") {</span> <span class="doccomment">/// println!("We've got {} reviews, but Les Misérables ain't one.",</span> <span class="doccomment">/// movie_reviews.len());</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // oops, this review has a lot of spelling mistakes, let's delete it.</span> <span class="doccomment">/// movie_reviews.remove("The Blues Brothers");</span> <span class="doccomment">///</span> <span class="doccomment">/// // look up the values associated with some keys.</span> <span class="doccomment">/// let to_find = ["Up!", "Office Space"];</span> <span class="doccomment">/// for book in &to_find {</span> <span class="doccomment">/// match movie_reviews.get(book) {</span> <span class="doccomment">/// Some(review) => println!("{}: {}", book, review),</span> <span class="doccomment">/// None => println!("{} is unreviewed.", book)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // iterate over everything.</span> <span class="doccomment">/// for (movie, review) in &movie_reviews {</span> <span class="doccomment">/// println!("{}: \"{}\"", movie, review);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// `BTreeMap` also implements an [`Entry API`](#method.entry), which allows</span> <span class="doccomment">/// for more complex methods of getting, setting, updating and removing keys and</span> <span class="doccomment">/// their values:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// // type inference lets us omit an explicit type signature (which</span> <span class="doccomment">/// // would be `BTreeMap<&str, u8>` in this example).</span> <span class="doccomment">/// let mut player_stats = BTreeMap::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// fn random_stat_buff() -> u8 {</span> <span class="doccomment">/// // could actually return some random value here - let's just return</span> <span class="doccomment">/// // some fixed value for now</span> <span class="doccomment">/// 42</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // insert a key only if it doesn't already exist</span> <span class="doccomment">/// player_stats.entry("health").or_insert(100);</span> <span class="doccomment">///</span> <span class="doccomment">/// // insert a key using a function that provides a new value only if it</span> <span class="doccomment">/// // doesn't already exist</span> <span class="doccomment">/// player_stats.entry("defence").or_insert_with(random_stat_buff);</span> <span class="doccomment">///</span> <span class="doccomment">/// // update a key, guarding against the key possibly not being set</span> <span class="doccomment">/// let stat = player_stats.entry("attack").or_insert(100);</span> <span class="doccomment">/// *stat += random_stat_buff();</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">"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">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">root</span>: <span class="ident">node</span>::<span class="ident">Root</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>, <span class="ident">length</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">"btree_drop"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.7.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="attribute">#[<span class="ident">may_dangle</span>]</span> <span class="ident">K</span>, <span class="attribute">#[<span class="ident">may_dangle</span>]</span> <span class="ident">V</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="kw">unsafe</span> { <span class="ident">drop</span>(<span class="ident">ptr</span>::<span class="ident">read</span>(<span class="self">self</span>).<span class="ident">into_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="ident">K</span>: <span class="ident">Clone</span>, <span class="ident">V</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone_subtree</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">Clone</span>, <span class="ident">V</span>: <span class="ident">Clone</span><span class="op">></span>(<span class="ident">node</span>: <span class="ident">node</span>::<span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Immut</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">></span>) <span class="op">-></span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">match</span> <span class="ident">node</span>.<span class="ident">force</span>() { <span class="ident">Leaf</span>(<span class="ident">leaf</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">out_tree</span> <span class="op">=</span> <span class="ident">BTreeMap</span> { <span class="ident">root</span>: <span class="ident">node</span>::<span class="ident">Root</span>::<span class="ident">new_leaf</span>(), <span class="ident">length</span>: <span class="number">0</span>, }; { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">out_node</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">out_tree</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>().<span class="ident">force</span>() { <span class="ident">Leaf</span>(<span class="ident">leaf</span>) <span class="op">=></span> <span class="ident">leaf</span>, <span class="ident">Internal</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(), }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">in_edge</span> <span class="op">=</span> <span class="ident">leaf</span>.<span class="ident">first_edge</span>(); <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=</span> <span class="ident">in_edge</span>.<span class="ident">right_kv</span>() { <span class="kw">let</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">into_kv</span>(); <span class="ident">in_edge</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">right_edge</span>(); <span class="ident">out_node</span>.<span class="ident">push</span>(<span class="ident">k</span>.<span class="ident">clone</span>(), <span class="ident">v</span>.<span class="ident">clone</span>()); <span class="ident">out_tree</span>.<span class="ident">length</span> <span class="op">+=</span> <span class="number">1</span>; } } <span class="ident">out_tree</span> } <span class="ident">Internal</span>(<span class="ident">internal</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">out_tree</span> <span class="op">=</span> <span class="ident">clone_subtree</span>(<span class="ident">internal</span>.<span class="ident">first_edge</span>().<span class="ident">descend</span>()); { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">out_node</span> <span class="op">=</span> <span class="ident">out_tree</span>.<span class="ident">root</span>.<span class="ident">push_level</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">in_edge</span> <span class="op">=</span> <span class="ident">internal</span>.<span class="ident">first_edge</span>(); <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=</span> <span class="ident">in_edge</span>.<span class="ident">right_kv</span>() { <span class="kw">let</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">into_kv</span>(); <span class="ident">in_edge</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">right_edge</span>(); <span class="kw">let</span> <span class="ident">k</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">k</span>).<span class="ident">clone</span>(); <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">v</span>).<span class="ident">clone</span>(); <span class="kw">let</span> <span class="ident">subtree</span> <span class="op">=</span> <span class="ident">clone_subtree</span>(<span class="ident">in_edge</span>.<span class="ident">descend</span>()); <span class="comment">// We can't destructure subtree directly</span> <span class="comment">// because BTreeMap implements Drop</span> <span class="kw">let</span> (<span class="ident">subroot</span>, <span class="ident">sublength</span>) <span class="op">=</span> <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">root</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="ident">subtree</span>.<span class="ident">root</span>); <span class="kw">let</span> <span class="ident">length</span> <span class="op">=</span> <span class="ident">subtree</span>.<span class="ident">length</span>; <span class="ident">mem</span>::<span class="ident">forget</span>(<span class="ident">subtree</span>); (<span class="ident">root</span>, <span class="ident">length</span>) }; <span class="ident">out_node</span>.<span class="ident">push</span>(<span class="ident">k</span>, <span class="ident">v</span>, <span class="ident">subroot</span>); <span class="ident">out_tree</span>.<span class="ident">length</span> <span class="op">+=</span> <span class="number">1</span> <span class="op">+</span> <span class="ident">sublength</span>; } } <span class="ident">out_tree</span> } } } <span class="ident">clone_subtree</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>()) } } <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="kw">super</span>::<span class="ident">Recover</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, ()<span class="op">></span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span> <span class="op">+</span> <span class="ident">Ord</span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="kw">type</span> <span class="ident">Key</span> <span class="op">=</span> <span class="ident">K</span>; <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">K</span><span class="op">></span> { <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_tree</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>(), <span class="ident">key</span>) { <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">handle</span>.<span class="ident">into_kv</span>().<span class="number">0</span>), <span class="ident">GoDown</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="kw">fn</span> <span class="ident">take</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> { <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_tree</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(), <span class="ident">key</span>) { <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> { <span class="prelude-val">Some</span>(<span class="ident">OccupiedEntry</span> { <span class="ident">handle</span>, <span class="ident">length</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">length</span>, <span class="ident">_marker</span>: <span class="ident">PhantomData</span>, } .<span class="ident">remove_kv</span>() .<span class="number">0</span>) } <span class="ident">GoDown</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="kw">fn</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">key</span>: <span class="ident">K</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> { <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_tree</span>::<span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span>, <span class="ident">K</span>, (), <span class="ident">K</span><span class="op">></span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(), <span class="kw-2">&</span><span class="ident">key</span>) { <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="ident">handle</span>.<span class="ident">into_kv_mut</span>().<span class="number">0</span>, <span class="ident">key</span>)), <span class="ident">GoDown</span>(<span class="ident">handle</span>) <span class="op">=></span> { <span class="ident">VacantEntry</span> { <span class="ident">key</span>, <span class="ident">handle</span>, <span class="ident">length</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">length</span>, <span class="ident">_marker</span>: <span class="ident">PhantomData</span>, } .<span class="ident">insert</span>(()); <span class="prelude-val">None</span> } } } } <span class="doccomment">/// An iterator over the entries of a `BTreeMap`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`iter`] method on [`BTreeMap`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`iter`]: struct.BTreeMap.html#method.iter</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">range</span>: <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>, <span class="ident">length</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">V</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">K</span>, <span class="ident">V</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_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>() } } <span class="doccomment">/// A mutable iterator over the entries of a `BTreeMap`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`iter_mut`] method on [`BTreeMap`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`iter_mut`]: struct.BTreeMap.html#method.iter_mut</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.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="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">range</span>: <span class="ident">RangeMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>, <span class="ident">length</span>: <span class="ident">usize</span>, } <span class="doccomment">/// An owning iterator over the entries of a `BTreeMap`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`into_iter`] method on [`BTreeMap`][`BTreeMap`]</span> <span class="doccomment">/// (provided by the `IntoIterator` trait). See its documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`into_iter`]: struct.BTreeMap.html#method.into_iter</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.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">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">front</span>: <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Owned</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span>, <span class="ident">back</span>: <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Owned</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span>, <span class="ident">length</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">V</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">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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="kw">let</span> <span class="ident">range</span> <span class="op">=</span> <span class="ident">Range</span> { <span class="ident">front</span>: <span class="self">self</span>.<span class="ident">front</span>.<span class="ident">reborrow</span>(), <span class="ident">back</span>: <span class="self">self</span>.<span class="ident">back</span>.<span class="ident">reborrow</span>(), }; <span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="ident">range</span>).<span class="ident">finish</span>() } } <span class="doccomment">/// An iterator over the keys of a `BTreeMap`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`keys`] method on [`BTreeMap`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`keys`]: struct.BTreeMap.html#method.keys</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.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">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">inner</span>: <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>() } } <span class="doccomment">/// An iterator over the values of a `BTreeMap`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`values`] method on [`BTreeMap`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`values`]: struct.BTreeMap.html#method.values</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.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">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">inner</span>: <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</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">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>() } } <span class="doccomment">/// A mutable iterator over the values of a `BTreeMap`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`values_mut`] method on [`BTreeMap`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`values_mut`]: struct.BTreeMap.html#method.values_mut</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"map_values_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ValuesMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">inner</span>: <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>, } <span class="doccomment">/// An iterator over a sub-range of entries in a `BTreeMap`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`range`] method on [`BTreeMap`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`range`]: struct.BTreeMap.html#method.range</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">front</span>: <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Immut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span>, <span class="ident">back</span>: <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Immut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">V</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">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>() } } <span class="doccomment">/// A mutable iterator over a sub-range of entries in a `BTreeMap`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`range_mut`] method on [`BTreeMap`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`range_mut`]: struct.BTreeMap.html#method.range_mut</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RangeMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">front</span>: <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span>, <span class="ident">back</span>: <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span>, <span class="comment">// Be invariant in `K` and `V`</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">K</span>, <span class="ident">V</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">V</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">RangeMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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="kw">let</span> <span class="ident">range</span> <span class="op">=</span> <span class="ident">Range</span> { <span class="ident">front</span>: <span class="self">self</span>.<span class="ident">front</span>.<span class="ident">reborrow</span>(), <span class="ident">back</span>: <span class="self">self</span>.<span class="ident">back</span>.<span class="ident">reborrow</span>(), }; <span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="ident">range</span>).<span class="ident">finish</span>() } } <span class="doccomment">/// A view into a single entry in a map, which may either be vacant or occupied.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `enum` is constructed from the [`entry`] method on [`BTreeMap`].</span> <span class="doccomment">///</span> <span class="doccomment">/// [`BTreeMap`]: struct.BTreeMap.html</span> <span class="doccomment">/// [`entry`]: struct.BTreeMap.html#method.entry</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">enum</span> <span class="ident">Entry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="doccomment">/// A vacant entry.</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="ident">Vacant</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="ident">VacantEntry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>), <span class="doccomment">/// An occupied entry.</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="ident">Occupied</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="ident">OccupiedEntry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">"debug_btree_map"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Ord</span>, <span class="ident">V</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Entry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Vacant</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=></span> <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Entry"</span>) .<span class="ident">field</span>(<span class="ident">v</span>) .<span class="ident">finish</span>(), <span class="ident">Occupied</span>(<span class="kw-2">ref</span> <span class="ident">o</span>) <span class="op">=></span> <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Entry"</span>) .<span class="ident">field</span>(<span class="ident">o</span>) .<span class="ident">finish</span>(), } } } <span class="doccomment">/// A view into a vacant entry in a `BTreeMap`.</span> <span class="doccomment">/// It is part of the [`Entry`] enum.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`Entry`]: enum.Entry.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">VacantEntry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">key</span>: <span class="ident">K</span>, <span class="ident">handle</span>: <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span>, <span class="ident">length</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">usize</span>, <span class="comment">// Be invariant in `K` and `V`</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">K</span>, <span class="ident">V</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">"debug_btree_map"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Ord</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">VacantEntry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">"VacantEntry"</span>) .<span class="ident">field</span>(<span class="self">self</span>.<span class="ident">key</span>()) .<span class="ident">finish</span>() } } <span class="doccomment">/// A view into an occupied entry in a `BTreeMap`.</span> <span class="doccomment">/// It is part of the [`Entry`] enum.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`Entry`]: enum.Entry.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">OccupiedEntry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">handle</span>: <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">KV</span><span class="op">></span>, <span class="ident">length</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">usize</span>, <span class="comment">// Be invariant in `K` and `V`</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">K</span>, <span class="ident">V</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">"debug_btree_map"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Ord</span>, <span class="ident">V</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">OccupiedEntry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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_struct</span>(<span class="string">"OccupiedEntry"</span>) .<span class="ident">field</span>(<span class="string">"key"</span>, <span class="self">self</span>.<span class="ident">key</span>()) .<span class="ident">field</span>(<span class="string">"value"</span>, <span class="self">self</span>.<span class="ident">get</span>()) .<span class="ident">finish</span>() } } <span class="comment">// An iterator for merging two sorted sequences into one</span> <span class="kw">struct</span> <span class="ident">MergeIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">>></span> { <span class="ident">left</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>, <span class="ident">right</span>: <span class="ident">Peekable</span><span class="op"><</span><span class="ident">I</span><span class="op">></span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="doccomment">/// Makes a new empty BTreeMap with a reasonable choice for B.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// // entries can now be inserted into the empty map</span> <span class="doccomment">/// map.insert(1, "a");</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">"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">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">BTreeMap</span> { <span class="ident">root</span>: <span class="ident">node</span>::<span class="ident">Root</span>::<span class="ident">new_leaf</span>(), <span class="ident">length</span>: <span class="number">0</span>, } } <span class="doccomment">/// Clears the map, removing all values.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeMap::new();</span> <span class="doccomment">/// a.insert(1, "a");</span> <span class="doccomment">/// a.clear();</span> <span class="doccomment">/// assert!(a.is_empty());</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">"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">fn</span> <span class="ident">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="comment">// FIXME(gereeter) .clear() allocates</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>(); } <span class="doccomment">/// Returns a reference to the value corresponding to the key.</span> <span class="doccomment">///</span> <span class="doccomment">/// The key may be any borrowed form of the map's key type, but the ordering</span> <span class="doccomment">/// on the borrowed form *must* match the ordering on the key type.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert(1, "a");</span> <span class="doccomment">/// assert_eq!(map.get(&1), Some(&"a"));</span> <span class="doccomment">/// assert_eq!(map.get(&2), None);</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">"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">fn</span> <span class="ident">get</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">V</span><span class="op">></span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_tree</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>(), <span class="ident">key</span>) { <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">handle</span>.<span class="ident">into_kv</span>().<span class="number">1</span>), <span class="ident">GoDown</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Returns the key-value pair corresponding to the supplied key.</span> <span class="doccomment">///</span> <span class="doccomment">/// The supplied key may be any borrowed form of the map's key type, but the ordering</span> <span class="doccomment">/// on the borrowed form *must* match the ordering on the key type.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// #![feature(map_get_key_value)]</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert(1, "a");</span> <span class="doccomment">/// assert_eq!(map.get_key_value(&1), Some((&1, &"a")));</span> <span class="doccomment">/// assert_eq!(map.get_key_value(&2), None);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"map_get_key_value"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"49347"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_key_value</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">k</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="kw-2">&</span><span class="ident">K</span>, <span class="kw-2">&</span><span class="ident">V</span>)<span class="op">></span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_tree</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>(), <span class="ident">k</span>) { <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">handle</span>.<span class="ident">into_kv</span>()), <span class="ident">GoDown</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Returns `true` if the map contains a value for the specified key.</span> <span class="doccomment">///</span> <span class="doccomment">/// The key may be any borrowed form of the map's key type, but the ordering</span> <span class="doccomment">/// on the borrowed form *must* match the ordering on the key type.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert(1, "a");</span> <span class="doccomment">/// assert_eq!(map.contains_key(&1), true);</span> <span class="doccomment">/// assert_eq!(map.contains_key(&2), false);</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">"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">fn</span> <span class="ident">contains_key</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">key</span>).<span class="ident">is_some</span>() } <span class="doccomment">/// Returns a mutable reference to the value corresponding to the key.</span> <span class="doccomment">///</span> <span class="doccomment">/// The key may be any borrowed form of the map's key type, but the ordering</span> <span class="doccomment">/// on the borrowed form *must* match the ordering on the key type.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert(1, "a");</span> <span class="doccomment">/// if let Some(x) = map.get_mut(&1) {</span> <span class="doccomment">/// *x = "b";</span> <span class="doccomment">/// }</span> <span class="doccomment">/// assert_eq!(map[&1], "b");</span> <span class="doccomment">/// ```</span> <span class="comment">// See `get` for implementation notes, this is basically a copy-paste with mut's added</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">fn</span> <span class="ident">get_mut</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">Q</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">V</span><span class="op">></span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_tree</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(), <span class="ident">key</span>) { <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">handle</span>.<span class="ident">into_kv_mut</span>().<span class="number">1</span>), <span class="ident">GoDown</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Inserts a key-value pair into the map.</span> <span class="doccomment">///</span> <span class="doccomment">/// If the map did not have this key present, `None` is returned.</span> <span class="doccomment">///</span> <span class="doccomment">/// If the map did have this key present, the value is updated, and the old</span> <span class="doccomment">/// value is returned. The key is not updated, though; this matters for</span> <span class="doccomment">/// types that can be `==` without being identical. See the [module-level</span> <span class="doccomment">/// documentation] for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [module-level documentation]: index.html#insert-and-complex-keys</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// assert_eq!(map.insert(37, "a"), None);</span> <span class="doccomment">/// assert_eq!(map.is_empty(), false);</span> <span class="doccomment">///</span> <span class="doccomment">/// map.insert(37, "b");</span> <span class="doccomment">/// assert_eq!(map.insert(37, "c"), Some("b"));</span> <span class="doccomment">/// assert_eq!(map[&37], "c");</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">"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">fn</span> <span class="ident">insert</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">K</span>, <span class="ident">value</span>: <span class="ident">V</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">V</span><span class="op">></span> { <span class="kw">match</span> <span class="self">self</span>.<span class="ident">entry</span>(<span class="ident">key</span>) { <span class="ident">Occupied</span>(<span class="kw-2">mut</span> <span class="ident">entry</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">entry</span>.<span class="ident">insert</span>(<span class="ident">value</span>)), <span class="ident">Vacant</span>(<span class="ident">entry</span>) <span class="op">=></span> { <span class="ident">entry</span>.<span class="ident">insert</span>(<span class="ident">value</span>); <span class="prelude-val">None</span> } } } <span class="doccomment">/// Removes a key from the map, returning the value at the key if the key</span> <span class="doccomment">/// was previously in the map.</span> <span class="doccomment">///</span> <span class="doccomment">/// The key may be any borrowed form of the map's key type, but the ordering</span> <span class="doccomment">/// on the borrowed form *must* match the ordering on the key type.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert(1, "a");</span> <span class="doccomment">/// assert_eq!(map.remove(&1), Some("a"));</span> <span class="doccomment">/// assert_eq!(map.remove(&1), None);</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">"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">fn</span> <span class="ident">remove</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">V</span><span class="op">></span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_tree</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(), <span class="ident">key</span>) { <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> { <span class="prelude-val">Some</span>(<span class="ident">OccupiedEntry</span> { <span class="ident">handle</span>, <span class="ident">length</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">length</span>, <span class="ident">_marker</span>: <span class="ident">PhantomData</span>, } .<span class="ident">remove</span>()) } <span class="ident">GoDown</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="prelude-val">None</span>, } } <span class="doccomment">/// Moves all elements from `other` into `Self`, leaving `other` empty.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeMap::new();</span> <span class="doccomment">/// a.insert(1, "a");</span> <span class="doccomment">/// a.insert(2, "b");</span> <span class="doccomment">/// a.insert(3, "c");</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut b = BTreeMap::new();</span> <span class="doccomment">/// b.insert(3, "d");</span> <span class="doccomment">/// b.insert(4, "e");</span> <span class="doccomment">/// b.insert(5, "f");</span> <span class="doccomment">///</span> <span class="doccomment">/// a.append(&mut b);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(a.len(), 5);</span> <span class="doccomment">/// assert_eq!(b.len(), 0);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(a[&1], "a");</span> <span class="doccomment">/// assert_eq!(a[&2], "b");</span> <span class="doccomment">/// assert_eq!(a[&3], "d");</span> <span class="doccomment">/// assert_eq!(a[&4], "e");</span> <span class="doccomment">/// assert_eq!(a[&5], "f");</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">"btree_append"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.11.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>) { <span class="comment">// Do we have to append anything at all?</span> <span class="kw">if</span> <span class="ident">other</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span>; } <span class="comment">// We can just swap `self` and `other` if `self` is empty.</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> { <span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>, <span class="ident">other</span>); <span class="kw">return</span>; } <span class="comment">// First, we merge `self` and `other` into a sorted sequence in linear time.</span> <span class="kw">let</span> <span class="ident">self_iter</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="self">self</span>, <span class="ident">BTreeMap</span>::<span class="ident">new</span>()).<span class="ident">into_iter</span>(); <span class="kw">let</span> <span class="ident">other_iter</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="ident">other</span>, <span class="ident">BTreeMap</span>::<span class="ident">new</span>()).<span class="ident">into_iter</span>(); <span class="kw">let</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">MergeIter</span> { <span class="ident">left</span>: <span class="ident">self_iter</span>.<span class="ident">peekable</span>(), <span class="ident">right</span>: <span class="ident">other_iter</span>.<span class="ident">peekable</span>(), }; <span class="comment">// Second, we build a tree from the sorted sequence in linear time.</span> <span class="self">self</span>.<span class="ident">from_sorted_iter</span>(<span class="ident">iter</span>); <span class="self">self</span>.<span class="ident">fix_right_edge</span>(); } <span class="doccomment">/// Constructs a double-ended iterator over a sub-range of elements in the map.</span> <span class="doccomment">/// The simplest way is to use the range syntax `min..max`, thus `range(min..max)` will</span> <span class="doccomment">/// yield elements from min (inclusive) to max (exclusive).</span> <span class="doccomment">/// The range may also be entered as `(Bound<T>, Bound<T>)`, so for example</span> <span class="doccomment">/// `range((Excluded(4), Included(10)))` will yield a left-exclusive, right-inclusive</span> <span class="doccomment">/// range from 4 to 10.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if range `start > end`.</span> <span class="doccomment">/// Panics if range `start == end` and both bounds are `Excluded`.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">/// use std::ops::Bound::Included;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert(3, "a");</span> <span class="doccomment">/// map.insert(5, "b");</span> <span class="doccomment">/// map.insert(8, "c");</span> <span class="doccomment">/// for (&key, &value) in map.range((Included(&4), Included(&8))) {</span> <span class="doccomment">/// println!("{}: {}", key, value);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// assert_eq!(Some((&5, &"b")), map.range(4..).next());</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">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">range</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">range</span>: <span class="ident">R</span>) <span class="op">-></span> <span class="ident">Range</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Ord</span>, <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">R</span>: <span class="ident">RangeBounds</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">root1</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>(); <span class="kw">let</span> <span class="ident">root2</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>(); <span class="kw">let</span> (<span class="ident">f</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="ident">range_search</span>(<span class="ident">root1</span>, <span class="ident">root2</span>, <span class="ident">range</span>); <span class="ident">Range</span> { <span class="ident">front</span>: <span class="ident">f</span>, <span class="ident">back</span>: <span class="ident">b</span>} } <span class="doccomment">/// Constructs a mutable double-ended iterator over a sub-range of elements in the map.</span> <span class="doccomment">/// The simplest way is to use the range syntax `min..max`, thus `range(min..max)` will</span> <span class="doccomment">/// yield elements from min (inclusive) to max (exclusive).</span> <span class="doccomment">/// The range may also be entered as `(Bound<T>, Bound<T>)`, so for example</span> <span class="doccomment">/// `range((Excluded(4), Included(10)))` will yield a left-exclusive, right-inclusive</span> <span class="doccomment">/// range from 4 to 10.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if range `start > end`.</span> <span class="doccomment">/// Panics if range `start == end` and both bounds are `Excluded`.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, i32> = ["Alice", "Bob", "Carol", "Cheryl"].iter()</span> <span class="doccomment">/// .map(|&s| (s, 0))</span> <span class="doccomment">/// .collect();</span> <span class="doccomment">/// for (_, balance) in map.range_mut("B".."Cheryl") {</span> <span class="doccomment">/// *balance += 100;</span> <span class="doccomment">/// }</span> <span class="doccomment">/// for (name, balance) in &map {</span> <span class="doccomment">/// println!("{} => {}", name, balance);</span> <span class="doccomment">/// }</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">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">range_mut</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</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">range</span>: <span class="ident">R</span>) <span class="op">-></span> <span class="ident">RangeMut</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Ord</span>, <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">R</span>: <span class="ident">RangeBounds</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">root1</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(); <span class="kw">let</span> <span class="ident">root2</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="ident">root1</span>) }; <span class="kw">let</span> (<span class="ident">f</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="ident">range_search</span>(<span class="ident">root1</span>, <span class="ident">root2</span>, <span class="ident">range</span>); <span class="ident">RangeMut</span> { <span class="ident">front</span>: <span class="ident">f</span>, <span class="ident">back</span>: <span class="ident">b</span>, <span class="ident">_marker</span>: <span class="ident">PhantomData</span>, } } <span class="doccomment">/// Gets the given key's corresponding entry in the map for in-place manipulation.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut count: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// // count the number of occurrences of letters in the vec</span> <span class="doccomment">/// for x in vec!["a","b","a","c","a","b"] {</span> <span class="doccomment">/// *count.entry(x).or_insert(0) += 1;</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(count["a"], 3);</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">"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">fn</span> <span class="ident">entry</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">K</span>) <span class="op">-></span> <span class="ident">Entry</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_tree</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(), <span class="kw-2">&</span><span class="ident">key</span>) { <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> { <span class="ident">Occupied</span>(<span class="ident">OccupiedEntry</span> { <span class="ident">handle</span>, <span class="ident">length</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">length</span>, <span class="ident">_marker</span>: <span class="ident">PhantomData</span>, }) } <span class="ident">GoDown</span>(<span class="ident">handle</span>) <span class="op">=></span> { <span class="ident">Vacant</span>(<span class="ident">VacantEntry</span> { <span class="ident">key</span>, <span class="ident">handle</span>, <span class="ident">length</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">length</span>, <span class="ident">_marker</span>: <span class="ident">PhantomData</span>, }) } } } <span class="kw">fn</span> <span class="ident">from_sorted_iter</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">last_leaf_edge</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>()).<span class="ident">into_node</span>(); <span class="comment">// Iterate through all key-value pairs, pushing them into nodes at the right level.</span> <span class="kw">for</span> (<span class="ident">key</span>, <span class="ident">value</span>) <span class="kw">in</span> <span class="ident">iter</span> { <span class="comment">// Try to push key-value pair into the current leaf node.</span> <span class="kw">if</span> <span class="ident">cur_node</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">node</span>::<span class="ident">CAPACITY</span> { <span class="ident">cur_node</span>.<span class="ident">push</span>(<span class="ident">key</span>, <span class="ident">value</span>); } <span class="kw">else</span> { <span class="comment">// No space left, go up and push there.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">open_node</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">test_node</span> <span class="op">=</span> <span class="ident">cur_node</span>.<span class="ident">forget_type</span>(); <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">test_node</span>.<span class="ident">ascend</span>() { <span class="prelude-val">Ok</span>(<span class="ident">parent</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">parent</span> <span class="op">=</span> <span class="ident">parent</span>.<span class="ident">into_node</span>(); <span class="kw">if</span> <span class="ident">parent</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">node</span>::<span class="ident">CAPACITY</span> { <span class="comment">// Found a node with space left, push here.</span> <span class="ident">open_node</span> <span class="op">=</span> <span class="ident">parent</span>; <span class="kw">break</span>; } <span class="kw">else</span> { <span class="comment">// Go up again.</span> <span class="ident">test_node</span> <span class="op">=</span> <span class="ident">parent</span>.<span class="ident">forget_type</span>(); } } <span class="prelude-val">Err</span>(<span class="ident">node</span>) <span class="op">=></span> { <span class="comment">// We are at the top, create a new root node and push there.</span> <span class="ident">open_node</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">into_root_mut</span>().<span class="ident">push_level</span>(); <span class="kw">break</span>; } } } <span class="comment">// Push key-value pair and new right subtree.</span> <span class="kw">let</span> <span class="ident">tree_height</span> <span class="op">=</span> <span class="ident">open_node</span>.<span class="ident">height</span>() <span class="op">-</span> <span class="number">1</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">right_tree</span> <span class="op">=</span> <span class="ident">node</span>::<span class="ident">Root</span>::<span class="ident">new_leaf</span>(); <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">tree_height</span> { <span class="ident">right_tree</span>.<span class="ident">push_level</span>(); } <span class="ident">open_node</span>.<span class="ident">push</span>(<span class="ident">key</span>, <span class="ident">value</span>, <span class="ident">right_tree</span>); <span class="comment">// Go down to the right-most leaf again.</span> <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">last_leaf_edge</span>(<span class="ident">open_node</span>.<span class="ident">forget_type</span>()).<span class="ident">into_node</span>(); } <span class="self">self</span>.<span class="ident">length</span> <span class="op">+=</span> <span class="number">1</span>; } } <span class="kw">fn</span> <span class="ident">fix_right_edge</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="comment">// Handle underfull nodes, start from the top.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_node</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(); <span class="kw">while</span> <span class="kw">let</span> <span class="ident">Internal</span>(<span class="ident">internal</span>) <span class="op">=</span> <span class="ident">cur_node</span>.<span class="ident">force</span>() { <span class="comment">// Check if right-most child is underfull.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_edge</span> <span class="op">=</span> <span class="ident">internal</span>.<span class="ident">last_edge</span>(); <span class="kw">let</span> <span class="ident">right_child_len</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">reborrow</span>().<span class="ident">descend</span>().<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">right_child_len</span> <span class="op"><</span> <span class="ident">node</span>::<span class="ident">MIN_LEN</span> { <span class="comment">// We need to steal.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_kv</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">last_edge</span>.<span class="ident">left_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">left</span>) <span class="op">=></span> <span class="ident">left</span>, <span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(), }; <span class="ident">last_kv</span>.<span class="ident">bulk_steal_left</span>(<span class="ident">node</span>::<span class="ident">MIN_LEN</span> <span class="op">-</span> <span class="ident">right_child_len</span>); <span class="ident">last_edge</span> <span class="op">=</span> <span class="ident">last_kv</span>.<span class="ident">right_edge</span>(); } <span class="comment">// Go further down.</span> <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">descend</span>(); } } <span class="doccomment">/// Splits the collection into two at the given key. Returns everything after the given key,</span> <span class="doccomment">/// including the key.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeMap::new();</span> <span class="doccomment">/// a.insert(1, "a");</span> <span class="doccomment">/// a.insert(2, "b");</span> <span class="doccomment">/// a.insert(3, "c");</span> <span class="doccomment">/// a.insert(17, "d");</span> <span class="doccomment">/// a.insert(41, "e");</span> <span class="doccomment">///</span> <span class="doccomment">/// let b = a.split_off(&3);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(a.len(), 2);</span> <span class="doccomment">/// assert_eq!(b.len(), 3);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(a[&1], "a");</span> <span class="doccomment">/// assert_eq!(a[&2], "b");</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(b[&3], "c");</span> <span class="doccomment">/// assert_eq!(b[&17], "d");</span> <span class="doccomment">/// assert_eq!(b[&41], "e");</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">"btree_split_off"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.11.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">split_off</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Ord</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="self">Self</span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="kw">return</span> <span class="self">Self</span>::<span class="ident">new</span>(); } <span class="kw">let</span> <span class="ident">total_num</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">right</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">new</span>(); <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>().<span class="ident">height</span>()) { <span class="ident">right</span>.<span class="ident">root</span>.<span class="ident">push_level</span>(); } { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">left_node</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">right_node</span> <span class="op">=</span> <span class="ident">right</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(); <span class="kw">loop</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">split_edge</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_node</span>(<span class="ident">left_node</span>, <span class="ident">key</span>) { <span class="comment">// key is going to the right tree</span> <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=></span> <span class="ident">handle</span>.<span class="ident">left_edge</span>(), <span class="ident">GoDown</span>(<span class="ident">handle</span>) <span class="op">=></span> <span class="ident">handle</span>, }; <span class="ident">split_edge</span>.<span class="ident">move_suffix</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">right_node</span>); <span class="kw">match</span> (<span class="ident">split_edge</span>.<span class="ident">force</span>(), <span class="ident">right_node</span>.<span class="ident">force</span>()) { (<span class="ident">Internal</span>(<span class="ident">edge</span>), <span class="ident">Internal</span>(<span class="ident">node</span>)) <span class="op">=></span> { <span class="ident">left_node</span> <span class="op">=</span> <span class="ident">edge</span>.<span class="ident">descend</span>(); <span class="ident">right_node</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">first_edge</span>().<span class="ident">descend</span>(); } (<span class="ident">Leaf</span>(<span class="kw">_</span>), <span class="ident">Leaf</span>(<span class="kw">_</span>)) <span class="op">=></span> { <span class="kw">break</span>; } <span class="kw">_</span> <span class="op">=></span> { <span class="macro">unreachable</span><span class="macro">!</span>(); } } } } <span class="self">self</span>.<span class="ident">fix_right_border</span>(); <span class="ident">right</span>.<span class="ident">fix_left_border</span>(); <span class="kw">if</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>().<span class="ident">height</span>() <span class="op"><</span> <span class="ident">right</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>().<span class="ident">height</span>() { <span class="self">self</span>.<span class="ident">recalc_length</span>(); <span class="ident">right</span>.<span class="ident">length</span> <span class="op">=</span> <span class="ident">total_num</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">len</span>(); } <span class="kw">else</span> { <span class="ident">right</span>.<span class="ident">recalc_length</span>(); <span class="self">self</span>.<span class="ident">length</span> <span class="op">=</span> <span class="ident">total_num</span> <span class="op">-</span> <span class="ident">right</span>.<span class="ident">len</span>(); } <span class="ident">right</span> } <span class="doccomment">/// Calculates the number of elements if it is incorrect.</span> <span class="kw">fn</span> <span class="ident">recalc_length</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="kw">fn</span> <span class="ident">dfs</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>(<span class="ident">node</span>: <span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Immut</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">></span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Internal</span>(<span class="ident">node</span>) <span class="op">=</span> <span class="ident">node</span>.<span class="ident">force</span>() { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">edge</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">first_edge</span>(); <span class="kw">loop</span> { <span class="ident">res</span> <span class="op">+=</span> <span class="ident">dfs</span>(<span class="ident">edge</span>.<span class="ident">reborrow</span>().<span class="ident">descend</span>()); <span class="kw">match</span> <span class="ident">edge</span>.<span class="ident">right_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">right_kv</span>) <span class="op">=></span> { <span class="ident">edge</span> <span class="op">=</span> <span class="ident">right_kv</span>.<span class="ident">right_edge</span>(); } <span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=></span> { <span class="kw">break</span>; } } } } <span class="ident">res</span> } <span class="self">self</span>.<span class="ident">length</span> <span class="op">=</span> <span class="ident">dfs</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>()); } <span class="doccomment">/// Removes empty levels on the top.</span> <span class="kw">fn</span> <span class="ident">fix_top</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="kw">loop</span> { { <span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>(); <span class="kw">if</span> <span class="ident">node</span>.<span class="ident">height</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">||</span> <span class="ident">node</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">0</span> { <span class="kw">break</span>; } } <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">pop_level</span>(); } } <span class="kw">fn</span> <span class="ident">fix_right_border</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="self">self</span>.<span class="ident">fix_top</span>(); { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_node</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(); <span class="kw">while</span> <span class="kw">let</span> <span class="ident">Internal</span>(<span class="ident">node</span>) <span class="op">=</span> <span class="ident">cur_node</span>.<span class="ident">force</span>() { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_kv</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">last_kv</span>(); <span class="kw">if</span> <span class="ident">last_kv</span>.<span class="ident">can_merge</span>() { <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">last_kv</span>.<span class="ident">merge</span>().<span class="ident">descend</span>(); } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">right_len</span> <span class="op">=</span> <span class="ident">last_kv</span>.<span class="ident">reborrow</span>().<span class="ident">right_edge</span>().<span class="ident">descend</span>().<span class="ident">len</span>(); <span class="comment">// `MINLEN + 1` to avoid readjust if merge happens on the next level.</span> <span class="kw">if</span> <span class="ident">right_len</span> <span class="op"><</span> <span class="ident">node</span>::<span class="ident">MIN_LEN</span> <span class="op">+</span> <span class="number">1</span> { <span class="ident">last_kv</span>.<span class="ident">bulk_steal_left</span>(<span class="ident">node</span>::<span class="ident">MIN_LEN</span> <span class="op">+</span> <span class="number">1</span> <span class="op">-</span> <span class="ident">right_len</span>); } <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">last_kv</span>.<span class="ident">right_edge</span>().<span class="ident">descend</span>(); } } } <span class="self">self</span>.<span class="ident">fix_top</span>(); } <span class="doccomment">/// The symmetric clone of `fix_right_border`.</span> <span class="kw">fn</span> <span class="ident">fix_left_border</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="self">self</span>.<span class="ident">fix_top</span>(); { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_node</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(); <span class="kw">while</span> <span class="kw">let</span> <span class="ident">Internal</span>(<span class="ident">node</span>) <span class="op">=</span> <span class="ident">cur_node</span>.<span class="ident">force</span>() { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">first_kv</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">first_kv</span>(); <span class="kw">if</span> <span class="ident">first_kv</span>.<span class="ident">can_merge</span>() { <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">first_kv</span>.<span class="ident">merge</span>().<span class="ident">descend</span>(); } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">left_len</span> <span class="op">=</span> <span class="ident">first_kv</span>.<span class="ident">reborrow</span>().<span class="ident">left_edge</span>().<span class="ident">descend</span>().<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">left_len</span> <span class="op"><</span> <span class="ident">node</span>::<span class="ident">MIN_LEN</span> <span class="op">+</span> <span class="number">1</span> { <span class="ident">first_kv</span>.<span class="ident">bulk_steal_right</span>(<span class="ident">node</span>::<span class="ident">MIN_LEN</span> <span class="op">+</span> <span class="number">1</span> <span class="op">-</span> <span class="ident">left_len</span>); } <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">first_kv</span>.<span class="ident">left_edge</span>().<span class="ident">descend</span>(); } } } <span class="self">self</span>.<span class="ident">fix_top</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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</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">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</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">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">length</span> <span class="op">==</span> <span class="number">0</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">length</span> <span class="op">-=</span> <span class="number">1</span>; <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">range</span>.<span class="ident">next_unchecked</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">length</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">length</span>)) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">length</span> <span class="op">==</span> <span class="number">0</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">length</span> <span class="op">-=</span> <span class="number">1</span>; <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">range</span>.<span class="ident">next_back_unchecked</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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</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">K</span>, <span class="ident">V</span><span class="op">></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="self">self</span>.<span class="ident">length</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">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">Iter</span> { <span class="ident">range</span>: <span class="self">self</span>.<span class="ident">range</span>.<span class="ident">clone</span>(), <span class="ident">length</span>: <span class="self">self</span>.<span class="ident">length</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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</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">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</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">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter_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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">length</span> <span class="op">==</span> <span class="number">0</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">length</span> <span class="op">-=</span> <span class="number">1</span>; <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">range</span>.<span class="ident">next_unchecked</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">length</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">length</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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">length</span> <span class="op">==</span> <span class="number">0</span> { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">length</span> <span class="op">-=</span> <span class="number">1</span>; <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">range</span>.<span class="ident">next_back_unchecked</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">K</span>: <span class="lifetime">'a</span>, <span class="ident">V</span>: <span class="lifetime">'a</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">K</span>, <span class="ident">V</span><span class="op">></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="self">self</span>.<span class="ident">length</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</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="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>); <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">root1</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">root</span>).<span class="ident">into_ref</span>() }; <span class="kw">let</span> <span class="ident">root2</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">root</span>).<span class="ident">into_ref</span>() }; <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">length</span>; <span class="ident">mem</span>::<span class="ident">forget</span>(<span class="self">self</span>); <span class="ident">IntoIter</span> { <span class="ident">front</span>: <span class="ident">first_leaf_edge</span>(<span class="ident">root1</span>), <span class="ident">back</span>: <span class="ident">last_leaf_edge</span>(<span class="ident">root2</span>), <span class="ident">length</span>: <span class="ident">len</span>, } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_drop"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.7.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="self">self</span>.<span class="ident">for_each</span>(<span class="ident">drop</span>); <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">leaf_node</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">front</span>).<span class="ident">into_node</span>(); <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">first_parent</span>) <span class="op">=</span> <span class="ident">leaf_node</span>.<span class="ident">deallocate_and_ascend</span>() { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">first_parent</span>.<span class="ident">into_node</span>(); <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">parent</span>) <span class="op">=</span> <span class="ident">cur_node</span>.<span class="ident">deallocate_and_ascend</span>() { <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">parent</span>.<span class="ident">into_node</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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">length</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">length</span> <span class="op">-=</span> <span class="number">1</span>; } <span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">front</span>) }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_handle</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">handle</span>.<span class="ident">right_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">k</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">kv</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">0</span>) }; <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">kv</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">1</span>) }; <span class="self">self</span>.<span class="ident">front</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">right_edge</span>(); <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">k</span>, <span class="ident">v</span>)); } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> <span class="kw">unsafe</span> { <span class="ident">unwrap_unchecked</span>(<span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">deallocate_and_ascend</span>()) }, }; <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cur_handle</span>.<span class="ident">right_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">k</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">kv</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">0</span>) }; <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">kv</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">1</span>) }; <span class="self">self</span>.<span class="ident">front</span> <span class="op">=</span> <span class="ident">first_leaf_edge</span>(<span class="ident">kv</span>.<span class="ident">right_edge</span>().<span class="ident">descend</span>()); <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">k</span>, <span class="ident">v</span>)); } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> <span class="kw">unsafe</span> { <span class="ident">cur_handle</span> <span class="op">=</span> <span class="ident">unwrap_unchecked</span>(<span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">deallocate_and_ascend</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">length</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">length</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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></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="ident">K</span>, <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">length</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">length</span> <span class="op">-=</span> <span class="number">1</span>; } <span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">back</span>) }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_handle</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">handle</span>.<span class="ident">left_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">k</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">kv</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">0</span>) }; <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">kv</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">1</span>) }; <span class="self">self</span>.<span class="ident">back</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">left_edge</span>(); <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">k</span>, <span class="ident">v</span>)); } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> <span class="kw">unsafe</span> { <span class="ident">unwrap_unchecked</span>(<span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">deallocate_and_ascend</span>()) }, }; <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cur_handle</span>.<span class="ident">left_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">k</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">kv</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">0</span>) }; <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">kv</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">1</span>) }; <span class="self">self</span>.<span class="ident">back</span> <span class="op">=</span> <span class="ident">last_leaf_edge</span>(<span class="ident">kv</span>.<span class="ident">left_edge</span>().<span class="ident">descend</span>()); <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">k</span>, <span class="ident">v</span>)); } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> <span class="kw">unsafe</span> { <span class="ident">cur_handle</span> <span class="op">=</span> <span class="ident">unwrap_unchecked</span>(<span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">deallocate_and_ascend</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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></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="self">self</span>.<span class="ident">length</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</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">K</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</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">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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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">K</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">Keys</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</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">"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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">V</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">V</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">v</span>)<span class="op">|</span> <span class="ident">v</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">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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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">V</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">v</span>)<span class="op">|</span> <span class="ident">v</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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">Values</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">inner</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">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">front</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">back</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">next_unchecked</span>()) } } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"map_values_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">ValuesMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">V</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">V</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">v</span>)<span class="op">|</span> <span class="ident">v</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">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"map_values_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">ValuesMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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">V</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">v</span>)<span class="op">|</span> <span class="ident">v</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"map_values_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">ValuesMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">ValuesMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> {} <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">next_unchecked</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="lifetime">'a</span> <span class="ident">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</span>) { <span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">front</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_handle</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">handle</span>.<span class="ident">right_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">into_kv</span>(); <span class="self">self</span>.<span class="ident">front</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">right_edge</span>(); <span class="kw">return</span> <span class="ident">ret</span>; } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">next_level</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">ascend</span>().<span class="ident">ok</span>(); <span class="ident">unwrap_unchecked</span>(<span class="ident">next_level</span>) } }; <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cur_handle</span>.<span class="ident">right_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">into_kv</span>(); <span class="self">self</span>.<span class="ident">front</span> <span class="op">=</span> <span class="ident">first_leaf_edge</span>(<span class="ident">kv</span>.<span class="ident">right_edge</span>().<span class="ident">descend</span>()); <span class="kw">return</span> <span class="ident">ret</span>; } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">next_level</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">ascend</span>().<span class="ident">ok</span>(); <span class="ident">cur_handle</span> <span class="op">=</span> <span class="ident">unwrap_unchecked</span>(<span class="ident">next_level</span>); } } } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">front</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">back</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">next_back_unchecked</span>()) } } } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">next_back_unchecked</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="lifetime">'a</span> <span class="ident">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</span>) { <span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">back</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_handle</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">handle</span>.<span class="ident">left_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">into_kv</span>(); <span class="self">self</span>.<span class="ident">back</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">left_edge</span>(); <span class="kw">return</span> <span class="ident">ret</span>; } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">next_level</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">ascend</span>().<span class="ident">ok</span>(); <span class="ident">unwrap_unchecked</span>(<span class="ident">next_level</span>) } }; <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cur_handle</span>.<span class="ident">left_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">into_kv</span>(); <span class="self">self</span>.<span class="ident">back</span> <span class="op">=</span> <span class="ident">last_leaf_edge</span>(<span class="ident">kv</span>.<span class="ident">left_edge</span>().<span class="ident">descend</span>()); <span class="kw">return</span> <span class="ident">ret</span>; } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">next_level</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">ascend</span>().<span class="ident">ok</span>(); <span class="ident">cur_handle</span> <span class="op">=</span> <span class="ident">unwrap_unchecked</span>(<span class="ident">next_level</span>); } } } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">Range</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">Range</span> { <span class="ident">front</span>: <span class="self">self</span>.<span class="ident">front</span>, <span class="ident">back</span>: <span class="self">self</span>.<span class="ident">back</span>, } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">RangeMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">front</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">back</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">next_unchecked</span>()) } } } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">RangeMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">next_unchecked</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="lifetime">'a</span> <span class="ident">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span>) { <span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">front</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_handle</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">handle</span>.<span class="ident">right_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="ident">kv</span>).<span class="ident">into_kv_mut</span>(); <span class="self">self</span>.<span class="ident">front</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">right_edge</span>(); <span class="kw">return</span> (<span class="ident">k</span>, <span class="ident">v</span>); } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">next_level</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">ascend</span>().<span class="ident">ok</span>(); <span class="ident">unwrap_unchecked</span>(<span class="ident">next_level</span>) } }; <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cur_handle</span>.<span class="ident">right_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="ident">kv</span>).<span class="ident">into_kv_mut</span>(); <span class="self">self</span>.<span class="ident">front</span> <span class="op">=</span> <span class="ident">first_leaf_edge</span>(<span class="ident">kv</span>.<span class="ident">right_edge</span>().<span class="ident">descend</span>()); <span class="kw">return</span> (<span class="ident">k</span>, <span class="ident">v</span>); } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">next_level</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">ascend</span>().<span class="ident">ok</span>(); <span class="ident">cur_handle</span> <span class="op">=</span> <span class="ident">unwrap_unchecked</span>(<span class="ident">next_level</span>); } } } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"btree_range"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">RangeMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></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">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span>)<span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">front</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">back</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">next_back_unchecked</span>()) } } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">RangeMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> {} <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">RangeMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">next_back_unchecked</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="lifetime">'a</span> <span class="ident">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span>) { <span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">back</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_handle</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">handle</span>.<span class="ident">left_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="ident">kv</span>).<span class="ident">into_kv_mut</span>(); <span class="self">self</span>.<span class="ident">back</span> <span class="op">=</span> <span class="ident">kv</span>.<span class="ident">left_edge</span>(); <span class="kw">return</span> (<span class="ident">k</span>, <span class="ident">v</span>); } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">next_level</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">ascend</span>().<span class="ident">ok</span>(); <span class="ident">unwrap_unchecked</span>(<span class="ident">next_level</span>) } }; <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cur_handle</span>.<span class="ident">left_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">kv</span>) <span class="op">=></span> { <span class="kw">let</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="ident">kv</span>).<span class="ident">into_kv_mut</span>(); <span class="self">self</span>.<span class="ident">back</span> <span class="op">=</span> <span class="ident">last_leaf_edge</span>(<span class="ident">kv</span>.<span class="ident">left_edge</span>().<span class="ident">descend</span>()); <span class="kw">return</span> (<span class="ident">k</span>, <span class="ident">v</span>); } <span class="prelude-val">Err</span>(<span class="ident">last_edge</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">next_level</span> <span class="op">=</span> <span class="ident">last_edge</span>.<span class="ident">into_node</span>().<span class="ident">ascend</span>().<span class="ident">ok</span>(); <span class="ident">cur_handle</span> <span class="op">=</span> <span class="ident">unwrap_unchecked</span>(<span class="ident">next_level</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">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">FromIterator</span><span class="op"><</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">from_iter</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">>></span>(<span class="ident">iter</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>(); <span class="ident">map</span>.<span class="ident">extend</span>(<span class="ident">iter</span>); <span class="ident">map</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">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Extend</span><span class="op"><</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">extend</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">T</span>) { <span class="kw">for</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="kw">in</span> <span class="ident">iter</span> { <span class="self">self</span>.<span class="ident">insert</span>(<span class="ident">k</span>, <span class="ident">v</span>); } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extend_ref"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Copy</span>, <span class="ident">V</span>: <span class="ident">Copy</span><span class="op">></span> <span class="ident">Extend</span><span class="op"><</span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</span>)<span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">extend</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">K</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">V</span>)<span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) { <span class="self">self</span>.<span class="ident">extend</span>(<span class="ident">iter</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="kw-2">&</span><span class="ident">key</span>, <span class="kw-2">&</span><span class="ident">value</span>)<span class="op">|</span> (<span class="ident">key</span>, <span class="ident">value</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">K</span>: <span class="ident">Hash</span>, <span class="ident">V</span>: <span class="ident">Hash</span><span class="op">></span> <span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span>: <span class="ident">Hasher</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>) { <span class="kw">for</span> <span class="ident">elt</span> <span class="kw">in</span> <span class="self">self</span> { <span class="ident">elt</span>.<span class="ident">hash</span>(<span class="ident">state</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">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="doccomment">/// Creates an empty `BTreeMap<K, V>`.</span> <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">BTreeMap</span>::<span class="ident">new</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">K</span>: <span class="ident">PartialEq</span>, <span class="ident">V</span>: <span class="ident">PartialEq</span><span class="op">></span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></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="ident">other</span>.<span class="ident">len</span>() <span class="op">&&</span> <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">other</span>).<span class="ident">all</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="op">==</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="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">Eq</span>, <span class="ident">V</span>: <span class="ident">Eq</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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="ident">K</span>: <span class="ident">PartialOrd</span>, <span class="ident">V</span>: <span class="ident">PartialOrd</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</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">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></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="self">self</span>.<span class="ident">iter</span>().<span class="ident">partial_cmp</span>(<span class="ident">other</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="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</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">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Ordering</span> { <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">cmp</span>(<span class="ident">other</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="ident">K</span>: <span class="ident">Debug</span>, <span class="ident">V</span>: <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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_map</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">iter</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">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Index</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Q</span><span class="op">></span> <span class="kw">for</span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="kw">where</span> <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>, <span class="ident">Q</span>: <span class="ident">Ord</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">V</span>; <span class="doccomment">/// Returns a reference to the value corresponding to the supplied key.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if the key is not present in the `BTreeMap`.</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">key</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">V</span> { <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">key</span>).<span class="ident">expect</span>(<span class="string">"no entry found for key"</span>) } } <span class="kw">fn</span> <span class="ident">first_leaf_edge</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> (<span class="kw-2">mut</span> <span class="ident">node</span>: <span class="ident">NodeRef</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span> { <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">node</span>.<span class="ident">force</span>() { <span class="ident">Leaf</span>(<span class="ident">leaf</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">leaf</span>.<span class="ident">first_edge</span>(), <span class="ident">Internal</span>(<span class="ident">internal</span>) <span class="op">=></span> { <span class="ident">node</span> <span class="op">=</span> <span class="ident">internal</span>.<span class="ident">first_edge</span>().<span class="ident">descend</span>(); } } } } <span class="kw">fn</span> <span class="ident">last_leaf_edge</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> (<span class="kw-2">mut</span> <span class="ident">node</span>: <span class="ident">NodeRef</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span> { <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">node</span>.<span class="ident">force</span>() { <span class="ident">Leaf</span>(<span class="ident">leaf</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">leaf</span>.<span class="ident">last_edge</span>(), <span class="ident">Internal</span>(<span class="ident">internal</span>) <span class="op">=></span> { <span class="ident">node</span> <span class="op">=</span> <span class="ident">internal</span>.<span class="ident">last_edge</span>().<span class="ident">descend</span>(); } } } } <span class="kw">fn</span> <span class="ident">range_search</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">R</span>: <span class="ident">RangeBounds</span><span class="op"><</span><span class="ident">Q</span><span class="op">>></span>( <span class="ident">root1</span>: <span class="ident">NodeRef</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">></span>, <span class="ident">root2</span>: <span class="ident">NodeRef</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">></span>, <span class="ident">range</span>: <span class="ident">R</span> )<span class="op">-></span> (<span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span>, <span class="ident">Handle</span><span class="op"><</span><span class="ident">NodeRef</span><span class="op"><</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">></span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">></span>) <span class="kw">where</span> <span class="ident">Q</span>: <span class="ident">Ord</span>, <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span> { <span class="kw">match</span> (<span class="ident">range</span>.<span class="ident">start</span>(), <span class="ident">range</span>.<span class="ident">end</span>()) { (<span class="ident">Excluded</span>(<span class="ident">s</span>), <span class="ident">Excluded</span>(<span class="ident">e</span>)) <span class="kw">if</span> <span class="ident">s</span><span class="op">==</span><span class="ident">e</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"range start and end are equal and excluded in BTreeMap"</span>), (<span class="ident">Included</span>(<span class="ident">s</span>), <span class="ident">Included</span>(<span class="ident">e</span>)) <span class="op">|</span> (<span class="ident">Included</span>(<span class="ident">s</span>), <span class="ident">Excluded</span>(<span class="ident">e</span>)) <span class="op">|</span> (<span class="ident">Excluded</span>(<span class="ident">s</span>), <span class="ident">Included</span>(<span class="ident">e</span>)) <span class="op">|</span> (<span class="ident">Excluded</span>(<span class="ident">s</span>), <span class="ident">Excluded</span>(<span class="ident">e</span>)) <span class="kw">if</span> <span class="ident">s</span><span class="op">></span><span class="ident">e</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"range start is greater than range end in BTreeMap"</span>), <span class="kw">_</span> <span class="op">=></span> {}, }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">min_node</span> <span class="op">=</span> <span class="ident">root1</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">max_node</span> <span class="op">=</span> <span class="ident">root2</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">min_found</span> <span class="op">=</span> <span class="bool-val">false</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">max_found</span> <span class="op">=</span> <span class="bool-val">false</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">diverged</span> <span class="op">=</span> <span class="bool-val">false</span>; <span class="kw">loop</span> { <span class="kw">let</span> <span class="ident">min_edge</span> <span class="op">=</span> <span class="kw">match</span> (<span class="ident">min_found</span>, <span class="ident">range</span>.<span class="ident">start</span>()) { (<span class="bool-val">false</span>, <span class="ident">Included</span>(<span class="ident">key</span>)) <span class="op">=></span> <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_linear</span>(<span class="kw-2">&</span><span class="ident">min_node</span>, <span class="ident">key</span>) { (<span class="ident">i</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="ident">min_found</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="ident">i</span> }, (<span class="ident">i</span>, <span class="bool-val">false</span>) <span class="op">=></span> <span class="ident">i</span>, }, (<span class="bool-val">false</span>, <span class="ident">Excluded</span>(<span class="ident">key</span>)) <span class="op">=></span> <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_linear</span>(<span class="kw-2">&</span><span class="ident">min_node</span>, <span class="ident">key</span>) { (<span class="ident">i</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="ident">min_found</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="ident">i</span><span class="op">+</span><span class="number">1</span> }, (<span class="ident">i</span>, <span class="bool-val">false</span>) <span class="op">=></span> <span class="ident">i</span>, }, (<span class="kw">_</span>, <span class="ident">Unbounded</span>) <span class="op">=></span> <span class="number">0</span>, (<span class="bool-val">true</span>, <span class="ident">Included</span>(<span class="kw">_</span>)) <span class="op">=></span> <span class="ident">min_node</span>.<span class="ident">keys</span>().<span class="ident">len</span>(), (<span class="bool-val">true</span>, <span class="ident">Excluded</span>(<span class="kw">_</span>)) <span class="op">=></span> <span class="number">0</span>, }; <span class="kw">let</span> <span class="ident">max_edge</span> <span class="op">=</span> <span class="kw">match</span> (<span class="ident">max_found</span>, <span class="ident">range</span>.<span class="ident">end</span>()) { (<span class="bool-val">false</span>, <span class="ident">Included</span>(<span class="ident">key</span>)) <span class="op">=></span> <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_linear</span>(<span class="kw-2">&</span><span class="ident">max_node</span>, <span class="ident">key</span>) { (<span class="ident">i</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="ident">max_found</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="ident">i</span><span class="op">+</span><span class="number">1</span> }, (<span class="ident">i</span>, <span class="bool-val">false</span>) <span class="op">=></span> <span class="ident">i</span>, }, (<span class="bool-val">false</span>, <span class="ident">Excluded</span>(<span class="ident">key</span>)) <span class="op">=></span> <span class="kw">match</span> <span class="ident">search</span>::<span class="ident">search_linear</span>(<span class="kw-2">&</span><span class="ident">max_node</span>, <span class="ident">key</span>) { (<span class="ident">i</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="ident">max_found</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="ident">i</span> }, (<span class="ident">i</span>, <span class="bool-val">false</span>) <span class="op">=></span> <span class="ident">i</span>, }, (<span class="kw">_</span>, <span class="ident">Unbounded</span>) <span class="op">=></span> <span class="ident">max_node</span>.<span class="ident">keys</span>().<span class="ident">len</span>(), (<span class="bool-val">true</span>, <span class="ident">Included</span>(<span class="kw">_</span>)) <span class="op">=></span> <span class="number">0</span>, (<span class="bool-val">true</span>, <span class="ident">Excluded</span>(<span class="kw">_</span>)) <span class="op">=></span> <span class="ident">max_node</span>.<span class="ident">keys</span>().<span class="ident">len</span>(), }; <span class="kw">if</span> <span class="op">!</span><span class="ident">diverged</span> { <span class="kw">if</span> <span class="ident">max_edge</span> <span class="op"><</span> <span class="ident">min_edge</span> { <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Ord is ill-defined in BTreeMap range"</span>) } <span class="kw">if</span> <span class="ident">min_edge</span> <span class="op">!=</span> <span class="ident">max_edge</span> { <span class="ident">diverged</span> <span class="op">=</span> <span class="bool-val">true</span>; } } <span class="kw">let</span> <span class="ident">front</span> <span class="op">=</span> <span class="ident">Handle</span>::<span class="ident">new_edge</span>(<span class="ident">min_node</span>, <span class="ident">min_edge</span>); <span class="kw">let</span> <span class="ident">back</span> <span class="op">=</span> <span class="ident">Handle</span>::<span class="ident">new_edge</span>(<span class="ident">max_node</span>, <span class="ident">max_edge</span>); <span class="kw">match</span> (<span class="ident">front</span>.<span class="ident">force</span>(), <span class="ident">back</span>.<span class="ident">force</span>()) { (<span class="ident">Leaf</span>(<span class="ident">f</span>), <span class="ident">Leaf</span>(<span class="ident">b</span>)) <span class="op">=></span> { <span class="kw">return</span> (<span class="ident">f</span>, <span class="ident">b</span>); }, (<span class="ident">Internal</span>(<span class="ident">min_int</span>), <span class="ident">Internal</span>(<span class="ident">max_int</span>)) <span class="op">=></span> { <span class="ident">min_node</span> <span class="op">=</span> <span class="ident">min_int</span>.<span class="ident">descend</span>(); <span class="ident">max_node</span> <span class="op">=</span> <span class="ident">max_int</span>.<span class="ident">descend</span>(); }, <span class="kw">_</span> <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(<span class="string">"BTreeMap has different depths"</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">unwrap_unchecked</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">val</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">T</span> { <span class="ident">val</span>.<span class="ident">unwrap_or_else</span>(<span class="op">||</span> { <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">debug_assertions</span>) { <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"'unchecked' unwrap on None in BTreeMap"</span>); } <span class="kw">else</span> { <span class="ident">intrinsics</span>::<span class="ident">unreachable</span>(); } }) } <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="doccomment">/// Gets an iterator over the entries of the map, sorted by key.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert(3, "c");</span> <span class="doccomment">/// map.insert(2, "b");</span> <span class="doccomment">/// map.insert(1, "a");</span> <span class="doccomment">///</span> <span class="doccomment">/// for (key, value) in map.iter() {</span> <span class="doccomment">/// println!("{}: {}", key, value);</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let (first_key, first_value) = map.iter().next().unwrap();</span> <span class="doccomment">/// assert_eq!((*first_key, *first_value), (1, "a"));</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">"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">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">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">Iter</span> { <span class="ident">range</span>: <span class="ident">Range</span> { <span class="ident">front</span>: <span class="ident">first_leaf_edge</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>()), <span class="ident">back</span>: <span class="ident">last_leaf_edge</span>(<span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_ref</span>()), }, <span class="ident">length</span>: <span class="self">self</span>.<span class="ident">length</span>, } } <span class="doccomment">/// Gets a mutable iterator over the entries of the map, sorted by key.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map = BTreeMap::new();</span> <span class="doccomment">/// map.insert("a", 1);</span> <span class="doccomment">/// map.insert("b", 2);</span> <span class="doccomment">/// map.insert("c", 3);</span> <span class="doccomment">///</span> <span class="doccomment">/// // add 10 to the value if the key isn't "a"</span> <span class="doccomment">/// for (key, value) in map.iter_mut() {</span> <span class="doccomment">/// if key != &"a" {</span> <span class="doccomment">/// *value += 10;</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</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">"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">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">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">root1</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">root</span>.<span class="ident">as_mut</span>(); <span class="kw">let</span> <span class="ident">root2</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="ident">root1</span>) }; <span class="ident">IterMut</span> { <span class="ident">range</span>: <span class="ident">RangeMut</span> { <span class="ident">front</span>: <span class="ident">first_leaf_edge</span>(<span class="ident">root1</span>), <span class="ident">back</span>: <span class="ident">last_leaf_edge</span>(<span class="ident">root2</span>), <span class="ident">_marker</span>: <span class="ident">PhantomData</span>, }, <span class="ident">length</span>: <span class="self">self</span>.<span class="ident">length</span>, } } <span class="doccomment">/// Gets an iterator over the keys of the map, in sorted order.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeMap::new();</span> <span class="doccomment">/// a.insert(2, "b");</span> <span class="doccomment">/// a.insert(1, "a");</span> <span class="doccomment">///</span> <span class="doccomment">/// let keys: Vec<_> = a.keys().cloned().collect();</span> <span class="doccomment">/// assert_eq!(keys, [1, 2]);</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">"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">fn</span> <span class="ident">keys</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">Keys</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">iter</span>() } } <span class="doccomment">/// Gets an iterator over the values of the map, in order by key.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeMap::new();</span> <span class="doccomment">/// a.insert(1, "hello");</span> <span class="doccomment">/// a.insert(2, "goodbye");</span> <span class="doccomment">///</span> <span class="doccomment">/// let values: Vec<&str> = a.values().cloned().collect();</span> <span class="doccomment">/// assert_eq!(values, ["hello", "goodbye"]);</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">"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">fn</span> <span class="ident">values</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Values</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">Values</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">iter</span>() } } <span class="doccomment">/// Gets a mutable iterator over the values of the map, in order by key.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeMap::new();</span> <span class="doccomment">/// a.insert(1, String::from("hello"));</span> <span class="doccomment">/// a.insert(2, String::from("goodbye"));</span> <span class="doccomment">///</span> <span class="doccomment">/// for value in a.values_mut() {</span> <span class="doccomment">/// value.push_str("!");</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let values: Vec<String> = a.values().cloned().collect();</span> <span class="doccomment">/// assert_eq!(values, [String::from("hello!"),</span> <span class="doccomment">/// String::from("goodbye!")]);</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">"map_values_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">values_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">ValuesMut</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">ValuesMut</span> { <span class="ident">inner</span>: <span class="self">self</span>.<span class="ident">iter_mut</span>() } } <span class="doccomment">/// Returns the number of elements in the map.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeMap::new();</span> <span class="doccomment">/// assert_eq!(a.len(), 0);</span> <span class="doccomment">/// a.insert(1, "a");</span> <span class="doccomment">/// assert_eq!(a.len(), 1);</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">"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">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="self">self</span>.<span class="ident">length</span> } <span class="doccomment">/// Returns `true` if the map contains no elements.</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">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut a = BTreeMap::new();</span> <span class="doccomment">/// assert!(a.is_empty());</span> <span class="doccomment">/// a.insert(1, "a");</span> <span class="doccomment">/// assert!(!a.is_empty());</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">"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">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="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">Entry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="doccomment">/// Ensures a value is in the entry by inserting the default if empty, and returns</span> <span class="doccomment">/// a mutable reference to the value in the entry.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_insert(12);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(map["poneyland"], 12);</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">"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">fn</span> <span class="ident">or_insert</span>(<span class="self">self</span>, <span class="ident">default</span>: <span class="ident">V</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span> { <span class="kw">match</span> <span class="self">self</span> { <span class="ident">Occupied</span>(<span class="ident">entry</span>) <span class="op">=></span> <span class="ident">entry</span>.<span class="ident">into_mut</span>(), <span class="ident">Vacant</span>(<span class="ident">entry</span>) <span class="op">=></span> <span class="ident">entry</span>.<span class="ident">insert</span>(<span class="ident">default</span>), } } <span class="doccomment">/// Ensures a value is in the entry by inserting the result of the default function if empty,</span> <span class="doccomment">/// and returns a mutable reference to the value in the entry.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, String> = BTreeMap::new();</span> <span class="doccomment">/// let s = "hoho".to_string();</span> <span class="doccomment">///</span> <span class="doccomment">/// map.entry("poneyland").or_insert_with(|| s);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(map["poneyland"], "hoho".to_string());</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">"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">fn</span> <span class="ident">or_insert_with</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-></span> <span class="ident">V</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">default</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span> { <span class="kw">match</span> <span class="self">self</span> { <span class="ident">Occupied</span>(<span class="ident">entry</span>) <span class="op">=></span> <span class="ident">entry</span>.<span class="ident">into_mut</span>(), <span class="ident">Vacant</span>(<span class="ident">entry</span>) <span class="op">=></span> <span class="ident">entry</span>.<span class="ident">insert</span>(<span class="ident">default</span>()), } } <span class="doccomment">/// Returns a reference to this entry's key.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// assert_eq!(map.entry("poneyland").key(), &"poneyland");</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">"map_entry_keys"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">key</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">K</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Occupied</span>(<span class="kw-2">ref</span> <span class="ident">entry</span>) <span class="op">=></span> <span class="ident">entry</span>.<span class="ident">key</span>(), <span class="ident">Vacant</span>(<span class="kw-2">ref</span> <span class="ident">entry</span>) <span class="op">=></span> <span class="ident">entry</span>.<span class="ident">key</span>(), } } <span class="doccomment">/// Provides in-place mutable access to an occupied entry before any</span> <span class="doccomment">/// potential inserts into the map.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// map.entry("poneyland")</span> <span class="doccomment">/// .and_modify(|e| { *e += 1 })</span> <span class="doccomment">/// .or_insert(42);</span> <span class="doccomment">/// assert_eq!(map["poneyland"], 42);</span> <span class="doccomment">///</span> <span class="doccomment">/// map.entry("poneyland")</span> <span class="doccomment">/// .and_modify(|e| { *e += 1 })</span> <span class="doccomment">/// .or_insert(42);</span> <span class="doccomment">/// assert_eq!(map["poneyland"], 43);</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">"entry_and_modify"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">and_modify</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="self">Self</span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">V</span>) { <span class="kw">match</span> <span class="self">self</span> { <span class="ident">Occupied</span>(<span class="kw-2">mut</span> <span class="ident">entry</span>) <span class="op">=></span> { <span class="ident">f</span>(<span class="ident">entry</span>.<span class="ident">get_mut</span>()); <span class="ident">Occupied</span>(<span class="ident">entry</span>) }, <span class="ident">Vacant</span>(<span class="ident">entry</span>) <span class="op">=></span> <span class="ident">Vacant</span>(<span class="ident">entry</span>), } } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span>: <span class="ident">Default</span><span class="op">></span> <span class="ident">Entry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</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">"entry_or_default"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"44324"</span>)]</span> <span class="doccomment">/// Ensures a value is in the entry by inserting the default value if empty,</span> <span class="doccomment">/// and returns a mutable reference to the value in the entry.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// #![feature(entry_or_default)]</span> <span class="doccomment">/// # fn main() {</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, Option<usize>> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_default();</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(map["poneyland"], None);</span> <span class="doccomment">/// # }</span> <span class="doccomment">/// ```</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">or_default</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">V</span> { <span class="kw">match</span> <span class="self">self</span> { <span class="ident">Occupied</span>(<span class="ident">entry</span>) <span class="op">=></span> <span class="ident">entry</span>.<span class="ident">into_mut</span>(), <span class="ident">Vacant</span>(<span class="ident">entry</span>) <span class="op">=></span> <span class="ident">entry</span>.<span class="ident">insert</span>(<span class="ident">Default</span>::<span class="ident">default</span>()), } } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">VacantEntry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="doccomment">/// Gets a reference to the key that would be used when inserting a value</span> <span class="doccomment">/// through the VacantEntry.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// assert_eq!(map.entry("poneyland").key(), &"poneyland");</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">"map_entry_keys"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">key</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">K</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">key</span> } <span class="doccomment">/// Take ownership of the key.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">/// use std::collections::btree_map::Entry;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// if let Entry::Vacant(v) = map.entry("poneyland") {</span> <span class="doccomment">/// v.into_key();</span> <span class="doccomment">/// }</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">"map_entry_recover_keys2"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_key</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">K</span> { <span class="self">self</span>.<span class="ident">key</span> } <span class="doccomment">/// Sets the value of the entry with the `VacantEntry`'s key,</span> <span class="doccomment">/// and returns a mutable reference to it.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut count: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// // count the number of occurrences of letters in the vec</span> <span class="doccomment">/// for x in vec!["a","b","a","c","a","b"] {</span> <span class="doccomment">/// *count.entry(x).or_insert(0) += 1;</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(count["a"], 3);</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">"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">fn</span> <span class="ident">insert</span>(<span class="self">self</span>, <span class="ident">value</span>: <span class="ident">V</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">V</span> { <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">length</span> <span class="op">+=</span> <span class="number">1</span>; <span class="kw">let</span> <span class="ident">out_ptr</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ins_k</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ins_v</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ins_edge</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_parent</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">handle</span>.<span class="ident">insert</span>(<span class="self">self</span>.<span class="ident">key</span>, <span class="ident">value</span>) { (<span class="ident">Fit</span>(<span class="ident">handle</span>), <span class="kw">_</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">handle</span>.<span class="ident">into_kv_mut</span>().<span class="number">1</span>, (<span class="ident">Split</span>(<span class="ident">left</span>, <span class="ident">k</span>, <span class="ident">v</span>, <span class="ident">right</span>), <span class="ident">ptr</span>) <span class="op">=></span> { <span class="ident">ins_k</span> <span class="op">=</span> <span class="ident">k</span>; <span class="ident">ins_v</span> <span class="op">=</span> <span class="ident">v</span>; <span class="ident">ins_edge</span> <span class="op">=</span> <span class="ident">right</span>; <span class="ident">out_ptr</span> <span class="op">=</span> <span class="ident">ptr</span>; <span class="ident">left</span>.<span class="ident">ascend</span>().<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">n</span><span class="op">|</span> <span class="ident">n</span>.<span class="ident">into_root_mut</span>()) } }; <span class="kw">loop</span> { <span class="kw">match</span> <span class="ident">cur_parent</span> { <span class="prelude-val">Ok</span>(<span class="ident">parent</span>) <span class="op">=></span> { <span class="kw">match</span> <span class="ident">parent</span>.<span class="ident">insert</span>(<span class="ident">ins_k</span>, <span class="ident">ins_v</span>, <span class="ident">ins_edge</span>) { <span class="ident">Fit</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="kw">return</span> <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">out_ptr</span> }, <span class="ident">Split</span>(<span class="ident">left</span>, <span class="ident">k</span>, <span class="ident">v</span>, <span class="ident">right</span>) <span class="op">=></span> { <span class="ident">ins_k</span> <span class="op">=</span> <span class="ident">k</span>; <span class="ident">ins_v</span> <span class="op">=</span> <span class="ident">v</span>; <span class="ident">ins_edge</span> <span class="op">=</span> <span class="ident">right</span>; <span class="ident">cur_parent</span> <span class="op">=</span> <span class="ident">left</span>.<span class="ident">ascend</span>().<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">n</span><span class="op">|</span> <span class="ident">n</span>.<span class="ident">into_root_mut</span>()); } } } <span class="prelude-val">Err</span>(<span class="ident">root</span>) <span class="op">=></span> { <span class="ident">root</span>.<span class="ident">push_level</span>().<span class="ident">push</span>(<span class="ident">ins_k</span>, <span class="ident">ins_v</span>, <span class="ident">ins_edge</span>); <span class="kw">return</span> <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">out_ptr</span> }; } } } } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span><span class="op">></span> <span class="ident">OccupiedEntry</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="doccomment">/// Gets a reference to the key in the entry.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_insert(12);</span> <span class="doccomment">/// assert_eq!(map.entry("poneyland").key(), &"poneyland");</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">"map_entry_keys"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">key</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">K</span> { <span class="self">self</span>.<span class="ident">handle</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">0</span> } <span class="doccomment">/// Take ownership of the key and value from the map.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">/// use std::collections::btree_map::Entry;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_insert(12);</span> <span class="doccomment">///</span> <span class="doccomment">/// if let Entry::Occupied(o) = map.entry("poneyland") {</span> <span class="doccomment">/// // We delete the entry from the map.</span> <span class="doccomment">/// o.remove_entry();</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // If now try to get the value, it will panic:</span> <span class="doccomment">/// // println!("{}", map["poneyland"]);</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">"map_entry_recover_keys2"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove_entry</span>(<span class="self">self</span>) <span class="op">-></span> (<span class="ident">K</span>, <span class="ident">V</span>) { <span class="self">self</span>.<span class="ident">remove_kv</span>() } <span class="doccomment">/// Gets a reference to the value in the entry.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">/// use std::collections::btree_map::Entry;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_insert(12);</span> <span class="doccomment">///</span> <span class="doccomment">/// if let Entry::Occupied(o) = map.entry("poneyland") {</span> <span class="doccomment">/// assert_eq!(o.get(), &12);</span> <span class="doccomment">/// }</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">"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">fn</span> <span class="ident">get</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">V</span> { <span class="self">self</span>.<span class="ident">handle</span>.<span class="ident">reborrow</span>().<span class="ident">into_kv</span>().<span class="number">1</span> } <span class="doccomment">/// Gets a mutable reference to the value in the entry.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">/// use std::collections::btree_map::Entry;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_insert(12);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(map["poneyland"], 12);</span> <span class="doccomment">/// if let Entry::Occupied(mut o) = map.entry("poneyland") {</span> <span class="doccomment">/// *o.get_mut() += 10;</span> <span class="doccomment">/// }</span> <span class="doccomment">/// assert_eq!(map["poneyland"], 22);</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">"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">fn</span> <span class="ident">get_mut</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">V</span> { <span class="self">self</span>.<span class="ident">handle</span>.<span class="ident">kv_mut</span>().<span class="number">1</span> } <span class="doccomment">/// Converts the entry into a mutable reference to its value.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">/// use std::collections::btree_map::Entry;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_insert(12);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(map["poneyland"], 12);</span> <span class="doccomment">/// if let Entry::Occupied(o) = map.entry("poneyland") {</span> <span class="doccomment">/// *o.into_mut() += 10;</span> <span class="doccomment">/// }</span> <span class="doccomment">/// assert_eq!(map["poneyland"], 22);</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">"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">fn</span> <span class="ident">into_mut</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">V</span> { <span class="self">self</span>.<span class="ident">handle</span>.<span class="ident">into_kv_mut</span>().<span class="number">1</span> } <span class="doccomment">/// Sets the value of the entry with the `OccupiedEntry`'s key,</span> <span class="doccomment">/// and returns the entry's old value.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">/// use std::collections::btree_map::Entry;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_insert(12);</span> <span class="doccomment">///</span> <span class="doccomment">/// if let Entry::Occupied(mut o) = map.entry("poneyland") {</span> <span class="doccomment">/// assert_eq!(o.insert(15), 12);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// assert_eq!(map["poneyland"], 15);</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">"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">fn</span> <span class="ident">insert</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">V</span>) <span class="op">-></span> <span class="ident">V</span> { <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="self">self</span>.<span class="ident">get_mut</span>(), <span class="ident">value</span>) } <span class="doccomment">/// Takes the value of the entry out of the map, and returns it.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::BTreeMap;</span> <span class="doccomment">/// use std::collections::btree_map::Entry;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut map: BTreeMap<&str, usize> = BTreeMap::new();</span> <span class="doccomment">/// map.entry("poneyland").or_insert(12);</span> <span class="doccomment">///</span> <span class="doccomment">/// if let Entry::Occupied(o) = map.entry("poneyland") {</span> <span class="doccomment">/// assert_eq!(o.remove(), 12);</span> <span class="doccomment">/// }</span> <span class="doccomment">/// // If we try to get "poneyland"'s value, it'll panic:</span> <span class="doccomment">/// // println!("{}", map["poneyland"]);</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">"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">fn</span> <span class="ident">remove</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">V</span> { <span class="self">self</span>.<span class="ident">remove_kv</span>().<span class="number">1</span> } <span class="kw">fn</span> <span class="ident">remove_kv</span>(<span class="self">self</span>) <span class="op">-></span> (<span class="ident">K</span>, <span class="ident">V</span>) { <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">length</span> <span class="op">-=</span> <span class="number">1</span>; <span class="kw">let</span> (<span class="ident">small_leaf</span>, <span class="ident">old_key</span>, <span class="ident">old_val</span>) <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">handle</span>.<span class="ident">force</span>() { <span class="ident">Leaf</span>(<span class="ident">leaf</span>) <span class="op">=></span> { <span class="kw">let</span> (<span class="ident">hole</span>, <span class="ident">old_key</span>, <span class="ident">old_val</span>) <span class="op">=</span> <span class="ident">leaf</span>.<span class="ident">remove</span>(); (<span class="ident">hole</span>.<span class="ident">into_node</span>(), <span class="ident">old_key</span>, <span class="ident">old_val</span>) } <span class="ident">Internal</span>(<span class="kw-2">mut</span> <span class="ident">internal</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">key_loc</span> <span class="op">=</span> <span class="ident">internal</span>.<span class="ident">kv_mut</span>().<span class="number">0</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">K</span>; <span class="kw">let</span> <span class="ident">val_loc</span> <span class="op">=</span> <span class="ident">internal</span>.<span class="ident">kv_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">V</span>; <span class="kw">let</span> <span class="ident">to_remove</span> <span class="op">=</span> <span class="ident">first_leaf_edge</span>(<span class="ident">internal</span>.<span class="ident">right_edge</span>().<span class="ident">descend</span>()).<span class="ident">right_kv</span>().<span class="ident">ok</span>(); <span class="kw">let</span> <span class="ident">to_remove</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">unwrap_unchecked</span>(<span class="ident">to_remove</span>) }; <span class="kw">let</span> (<span class="ident">hole</span>, <span class="ident">key</span>, <span class="ident">val</span>) <span class="op">=</span> <span class="ident">to_remove</span>.<span class="ident">remove</span>(); <span class="kw">let</span> <span class="ident">old_key</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">key_loc</span>, <span class="ident">key</span>) }; <span class="kw">let</span> <span class="ident">old_val</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">val_loc</span>, <span class="ident">val</span>) }; (<span class="ident">hole</span>.<span class="ident">into_node</span>(), <span class="ident">old_key</span>, <span class="ident">old_val</span>) } }; <span class="comment">// Handle underflow</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">small_leaf</span>.<span class="ident">forget_type</span>(); <span class="kw">while</span> <span class="ident">cur_node</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">node</span>::<span class="ident">CAPACITY</span> <span class="op">/</span> <span class="number">2</span> { <span class="kw">match</span> <span class="ident">handle_underfull_node</span>(<span class="ident">cur_node</span>) { <span class="ident">AtRoot</span> <span class="op">=></span> <span class="kw">break</span>, <span class="ident">EmptyParent</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(), <span class="ident">Merged</span>(<span class="ident">parent</span>) <span class="op">=></span> { <span class="kw">if</span> <span class="ident">parent</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> { <span class="comment">// We must be at the root</span> <span class="ident">parent</span>.<span class="ident">into_root_mut</span>().<span class="ident">pop_level</span>(); <span class="kw">break</span>; } <span class="kw">else</span> { <span class="ident">cur_node</span> <span class="op">=</span> <span class="ident">parent</span>.<span class="ident">forget_type</span>(); } } <span class="ident">Stole</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="kw">break</span>, } } (<span class="ident">old_key</span>, <span class="ident">old_val</span>) } } <span class="kw">enum</span> <span class="ident">UnderflowResult</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="ident">AtRoot</span>, <span class="ident">EmptyParent</span>(<span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Internal</span><span class="op">></span>), <span class="ident">Merged</span>(<span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Internal</span><span class="op">></span>), <span class="ident">Stole</span>(<span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">Internal</span><span class="op">></span>), } <span class="kw">fn</span> <span class="ident">handle_underfull_node</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span>(<span class="ident">node</span>: <span class="ident">NodeRef</span><span class="op"><</span><span class="ident">marker</span>::<span class="ident">Mut</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">></span>) <span class="op">-></span> <span class="ident">UnderflowResult</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, <span class="ident">V</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">parent</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">parent</span>) <span class="op">=</span> <span class="ident">node</span>.<span class="ident">ascend</span>() { <span class="ident">parent</span> } <span class="kw">else</span> { <span class="kw">return</span> <span class="ident">AtRoot</span>; }; <span class="kw">let</span> (<span class="ident">is_left</span>, <span class="kw-2">mut</span> <span class="ident">handle</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">parent</span>.<span class="ident">left_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">left</span>) <span class="op">=></span> (<span class="bool-val">true</span>, <span class="ident">left</span>), <span class="prelude-val">Err</span>(<span class="ident">parent</span>) <span class="op">=></span> { <span class="kw">match</span> <span class="ident">parent</span>.<span class="ident">right_kv</span>() { <span class="prelude-val">Ok</span>(<span class="ident">right</span>) <span class="op">=></span> (<span class="bool-val">false</span>, <span class="ident">right</span>), <span class="prelude-val">Err</span>(<span class="ident">parent</span>) <span class="op">=></span> { <span class="kw">return</span> <span class="ident">EmptyParent</span>(<span class="ident">parent</span>.<span class="ident">into_node</span>()); } } } }; <span class="kw">if</span> <span class="ident">handle</span>.<span class="ident">can_merge</span>() { <span class="ident">Merged</span>(<span class="ident">handle</span>.<span class="ident">merge</span>().<span class="ident">into_node</span>()) } <span class="kw">else</span> { <span class="kw">if</span> <span class="ident">is_left</span> { <span class="ident">handle</span>.<span class="ident">steal_left</span>(); } <span class="kw">else</span> { <span class="ident">handle</span>.<span class="ident">steal_right</span>(); } <span class="ident">Stole</span>(<span class="ident">handle</span>.<span class="ident">into_node</span>()) } } <span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">Ord</span>, <span class="ident">V</span>, <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">>></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">MergeIter</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</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">K</span>, <span class="ident">V</span>)<span class="op">></span> { <span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="kw">match</span> (<span class="self">self</span>.<span class="ident">left</span>.<span class="ident">peek</span>(), <span class="self">self</span>.<span class="ident">right</span>.<span class="ident">peek</span>()) { (<span class="prelude-val">Some</span>(<span class="kw-2">&</span>(<span class="kw-2">ref</span> <span class="ident">left_key</span>, <span class="kw">_</span>)), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>(<span class="kw-2">ref</span> <span class="ident">right_key</span>, <span class="kw">_</span>))) <span class="op">=></span> <span class="ident">left_key</span>.<span class="ident">cmp</span>(<span class="ident">right_key</span>), (<span class="prelude-val">Some</span>(<span class="kw">_</span>), <span class="prelude-val">None</span>) <span class="op">=></span> <span class="ident">Ordering</span>::<span class="ident">Less</span>, (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="kw">_</span>)) <span class="op">=></span> <span class="ident">Ordering</span>::<span class="ident">Greater</span>, (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>, }; <span class="comment">// Check which elements comes first and only advance the corresponding iterator.</span> <span class="comment">// If two keys are equal, take the value from `right`.</span> <span class="kw">match</span> <span class="ident">res</span> { <span class="ident">Ordering</span>::<span class="ident">Less</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">left</span>.<span class="ident">next</span>(), <span class="ident">Ordering</span>::<span class="ident">Greater</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">right</span>.<span class="ident">next</span>(), <span class="ident">Ordering</span>::<span class="ident">Equal</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">left</span>.<span class="ident">next</span>(); <span class="self">self</span>.<span class="ident">right</span>.<span class="ident">next</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 results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all 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