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<form class="search-form js-only"> <div class="search-container"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"> </div> </form> </nav> <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span id="12"> 12</span> <span id="13"> 13</span> <span id="14"> 14</span> <span id="15"> 15</span> <span id="16"> 16</span> <span id="17"> 17</span> <span id="18"> 18</span> <span id="19"> 19</span> <span id="20"> 20</span> <span id="21"> 21</span> <span id="22"> 22</span> <span id="23"> 23</span> <span id="24"> 24</span> <span id="25"> 25</span> <span id="26"> 26</span> <span id="27"> 27</span> <span id="28"> 28</span> <span id="29"> 29</span> 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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 id="1329">1329</span> <span id="1330">1330</span> <span id="1331">1331</span> <span id="1332">1332</span> <span id="1333">1333</span> <span id="1334">1334</span> <span id="1335">1335</span> <span id="1336">1336</span> <span id="1337">1337</span> <span id="1338">1338</span> <span id="1339">1339</span> <span id="1340">1340</span> <span id="1341">1341</span> <span id="1342">1342</span> <span id="1343">1343</span> <span id="1344">1344</span> <span id="1345">1345</span> <span id="1346">1346</span> <span id="1347">1347</span> <span 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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 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id="2468">2468</span> <span id="2469">2469</span> <span id="2470">2470</span> <span id="2471">2471</span> <span id="2472">2472</span> <span id="2473">2473</span> <span id="2474">2474</span> <span id="2475">2475</span> <span id="2476">2476</span> <span id="2477">2477</span> <span id="2478">2478</span> <span id="2479">2479</span> <span id="2480">2480</span> <span id="2481">2481</span> <span id="2482">2482</span> <span id="2483">2483</span> <span id="2484">2484</span> <span id="2485">2485</span> <span id="2486">2486</span> <span id="2487">2487</span> <span id="2488">2488</span> <span id="2489">2489</span> <span id="2490">2490</span> <span id="2491">2491</span> <span id="2492">2492</span> <span id="2493">2493</span> <span id="2494">2494</span> <span id="2495">2495</span> <span id="2496">2496</span> <span id="2497">2497</span> <span id="2498">2498</span> <span id="2499">2499</span> <span id="2500">2500</span> <span id="2501">2501</span> <span id="2502">2502</span> <span id="2503">2503</span> <span id="2504">2504</span> <span id="2505">2505</span> <span id="2506">2506</span> <span id="2507">2507</span> <span id="2508">2508</span> <span id="2509">2509</span> <span id="2510">2510</span> <span id="2511">2511</span> <span id="2512">2512</span> <span id="2513">2513</span> <span id="2514">2514</span> <span id="2515">2515</span> <span id="2516">2516</span> <span id="2517">2517</span> <span id="2518">2518</span> <span id="2519">2519</span> <span id="2520">2520</span> <span id="2521">2521</span> <span id="2522">2522</span> <span id="2523">2523</span> <span id="2524">2524</span> <span id="2525">2525</span> <span id="2526">2526</span> <span id="2527">2527</span> <span id="2528">2528</span> <span id="2529">2529</span> <span id="2530">2530</span> <span id="2531">2531</span> <span id="2532">2532</span> <span id="2533">2533</span> <span id="2534">2534</span> <span id="2535">2535</span> <span id="2536">2536</span> <span id="2537">2537</span> <span id="2538">2538</span> <span id="2539">2539</span> <span id="2540">2540</span> <span id="2541">2541</span> <span id="2542">2542</span> <span id="2543">2543</span> <span id="2544">2544</span> <span id="2545">2545</span> <span id="2546">2546</span> <span id="2547">2547</span> <span id="2548">2548</span> <span id="2549">2549</span> <span id="2550">2550</span> <span id="2551">2551</span> <span id="2552">2552</span> <span id="2553">2553</span> <span id="2554">2554</span> <span id="2555">2555</span> <span id="2556">2556</span> <span id="2557">2557</span> <span id="2558">2558</span> <span id="2559">2559</span> <span id="2560">2560</span> <span id="2561">2561</span> <span id="2562">2562</span> <span id="2563">2563</span> <span id="2564">2564</span> <span id="2565">2565</span> <span id="2566">2566</span> <span id="2567">2567</span> <span id="2568">2568</span> <span id="2569">2569</span> <span id="2570">2570</span> <span id="2571">2571</span> <span id="2572">2572</span> <span id="2573">2573</span> <span id="2574">2574</span> <span id="2575">2575</span> <span id="2576">2576</span> <span id="2577">2577</span> <span id="2578">2578</span> <span id="2579">2579</span> <span id="2580">2580</span> <span id="2581">2581</span> <span id="2582">2582</span> <span id="2583">2583</span> <span id="2584">2584</span> <span id="2585">2585</span> <span id="2586">2586</span> <span id="2587">2587</span> <span id="2588">2588</span> <span id="2589">2589</span> <span id="2590">2590</span> <span id="2591">2591</span> <span id="2592">2592</span> <span id="2593">2593</span> <span id="2594">2594</span> <span id="2595">2595</span> <span id="2596">2596</span> <span id="2597">2597</span> <span id="2598">2598</span> <span id="2599">2599</span> <span id="2600">2600</span> <span id="2601">2601</span> <span id="2602">2602</span> <span id="2603">2603</span> <span id="2604">2604</span> <span id="2605">2605</span> <span id="2606">2606</span> <span id="2607">2607</span> <span id="2608">2608</span> <span id="2609">2609</span> <span id="2610">2610</span> <span id="2611">2611</span> <span id="2612">2612</span> <span id="2613">2613</span> <span id="2614">2614</span> <span id="2615">2615</span> <span id="2616">2616</span> <span id="2617">2617</span> <span id="2618">2618</span> <span id="2619">2619</span> <span id="2620">2620</span> <span id="2621">2621</span> <span id="2622">2622</span> <span id="2623">2623</span> <span id="2624">2624</span> <span id="2625">2625</span> <span id="2626">2626</span> <span id="2627">2627</span> <span id="2628">2628</span> <span id="2629">2629</span> <span id="2630">2630</span> <span id="2631">2631</span> <span id="2632">2632</span> <span id="2633">2633</span> <span id="2634">2634</span> <span id="2635">2635</span> <span id="2636">2636</span> <span id="2637">2637</span> <span id="2638">2638</span> <span id="2639">2639</span> <span id="2640">2640</span> <span id="2641">2641</span> <span id="2642">2642</span> <span id="2643">2643</span> <span id="2644">2644</span> <span id="2645">2645</span> <span id="2646">2646</span> <span id="2647">2647</span> <span id="2648">2648</span> <span id="2649">2649</span> <span id="2650">2650</span> <span id="2651">2651</span> <span id="2652">2652</span> <span id="2653">2653</span> <span id="2654">2654</span> <span id="2655">2655</span> <span id="2656">2656</span> <span id="2657">2657</span> <span id="2658">2658</span> <span id="2659">2659</span> <span id="2660">2660</span> <span id="2661">2661</span> <span id="2662">2662</span> <span id="2663">2663</span> <span id="2664">2664</span> <span id="2665">2665</span> <span id="2666">2666</span> <span id="2667">2667</span> <span id="2668">2668</span> <span id="2669">2669</span> <span id="2670">2670</span> <span id="2671">2671</span> <span id="2672">2672</span> <span id="2673">2673</span> <span id="2674">2674</span> <span id="2675">2675</span> <span id="2676">2676</span> <span id="2677">2677</span> <span id="2678">2678</span> <span id="2679">2679</span> <span id="2680">2680</span> <span id="2681">2681</span> <span id="2682">2682</span> <span id="2683">2683</span> <span id="2684">2684</span> <span id="2685">2685</span> <span id="2686">2686</span> <span id="2687">2687</span> <span id="2688">2688</span> <span id="2689">2689</span> <span id="2690">2690</span> <span id="2691">2691</span> <span id="2692">2692</span> <span id="2693">2693</span> <span id="2694">2694</span> <span id="2695">2695</span> <span id="2696">2696</span> <span id="2697">2697</span> <span id="2698">2698</span> <span id="2699">2699</span> <span id="2700">2700</span> <span id="2701">2701</span> <span id="2702">2702</span> <span id="2703">2703</span> <span id="2704">2704</span> <span id="2705">2705</span> <span id="2706">2706</span> <span id="2707">2707</span> <span id="2708">2708</span> <span id="2709">2709</span> <span id="2710">2710</span> <span id="2711">2711</span> <span id="2712">2712</span> <span id="2713">2713</span> <span id="2714">2714</span> <span id="2715">2715</span> <span id="2716">2716</span> <span id="2717">2717</span> <span id="2718">2718</span> <span id="2719">2719</span> <span id="2720">2720</span> <span id="2721">2721</span> <span id="2722">2722</span> <span id="2723">2723</span> <span id="2724">2724</span> <span id="2725">2725</span> <span id="2726">2726</span> <span id="2727">2727</span> <span id="2728">2728</span> <span id="2729">2729</span> <span id="2730">2730</span> <span id="2731">2731</span> <span id="2732">2732</span> <span id="2733">2733</span> <span id="2734">2734</span> <span id="2735">2735</span> <span id="2736">2736</span> <span id="2737">2737</span> <span id="2738">2738</span> <span id="2739">2739</span> <span id="2740">2740</span> <span id="2741">2741</span> <span id="2742">2742</span> <span id="2743">2743</span> <span id="2744">2744</span> <span id="2745">2745</span> <span id="2746">2746</span> <span id="2747">2747</span> <span id="2748">2748</span> <span id="2749">2749</span> <span id="2750">2750</span> <span id="2751">2751</span> <span id="2752">2752</span> <span id="2753">2753</span> <span id="2754">2754</span> <span id="2755">2755</span> <span id="2756">2756</span> <span id="2757">2757</span> <span id="2758">2758</span> <span id="2759">2759</span> <span id="2760">2760</span> <span id="2761">2761</span> <span id="2762">2762</span> <span id="2763">2763</span> <span id="2764">2764</span> <span id="2765">2765</span> <span id="2766">2766</span> <span id="2767">2767</span> <span id="2768">2768</span> <span id="2769">2769</span> <span id="2770">2770</span> <span id="2771">2771</span> <span id="2772">2772</span> <span id="2773">2773</span> <span id="2774">2774</span> <span id="2775">2775</span> <span id="2776">2776</span> <span id="2777">2777</span> <span id="2778">2778</span> <span id="2779">2779</span> <span id="2780">2780</span> <span id="2781">2781</span> <span id="2782">2782</span> <span id="2783">2783</span> <span id="2784">2784</span> <span id="2785">2785</span> <span id="2786">2786</span> <span id="2787">2787</span> <span id="2788">2788</span> <span id="2789">2789</span> <span id="2790">2790</span> <span id="2791">2791</span> <span id="2792">2792</span> <span id="2793">2793</span> <span id="2794">2794</span> <span id="2795">2795</span> <span id="2796">2796</span> <span id="2797">2797</span> <span id="2798">2798</span> <span id="2799">2799</span> <span id="2800">2800</span> <span id="2801">2801</span> <span id="2802">2802</span> <span id="2803">2803</span> <span id="2804">2804</span> <span id="2805">2805</span> <span id="2806">2806</span> <span id="2807">2807</span> <span id="2808">2808</span> <span id="2809">2809</span> <span id="2810">2810</span> <span id="2811">2811</span> <span id="2812">2812</span> <span id="2813">2813</span> <span id="2814">2814</span> <span id="2815">2815</span> <span id="2816">2816</span> <span id="2817">2817</span> <span id="2818">2818</span> <span id="2819">2819</span> <span id="2820">2820</span> <span id="2821">2821</span> <span id="2822">2822</span> <span id="2823">2823</span> <span id="2824">2824</span> <span id="2825">2825</span> <span id="2826">2826</span> <span id="2827">2827</span> <span id="2828">2828</span> <span id="2829">2829</span> <span id="2830">2830</span> <span id="2831">2831</span> <span id="2832">2832</span> <span id="2833">2833</span> <span id="2834">2834</span> <span id="2835">2835</span> <span id="2836">2836</span> <span id="2837">2837</span> <span id="2838">2838</span> <span id="2839">2839</span> <span id="2840">2840</span> <span id="2841">2841</span> <span id="2842">2842</span> <span id="2843">2843</span> <span id="2844">2844</span> <span id="2845">2845</span> <span id="2846">2846</span> <span id="2847">2847</span> <span id="2848">2848</span> <span id="2849">2849</span> <span id="2850">2850</span> <span id="2851">2851</span> <span id="2852">2852</span> <span id="2853">2853</span> <span id="2854">2854</span> <span id="2855">2855</span> <span id="2856">2856</span> <span id="2857">2857</span> <span id="2858">2858</span> <span id="2859">2859</span> <span id="2860">2860</span> <span id="2861">2861</span> <span id="2862">2862</span> <span id="2863">2863</span> <span id="2864">2864</span> <span id="2865">2865</span> <span id="2866">2866</span> <span id="2867">2867</span> <span id="2868">2868</span> <span id="2869">2869</span> <span id="2870">2870</span> <span id="2871">2871</span> <span id="2872">2872</span> <span id="2873">2873</span> <span id="2874">2874</span> <span id="2875">2875</span> <span id="2876">2876</span> <span id="2877">2877</span> <span id="2878">2878</span> <span id="2879">2879</span> <span id="2880">2880</span> <span id="2881">2881</span> <span id="2882">2882</span> <span id="2883">2883</span> <span id="2884">2884</span> <span id="2885">2885</span> <span id="2886">2886</span> <span id="2887">2887</span> <span id="2888">2888</span> <span id="2889">2889</span> <span id="2890">2890</span> <span id="2891">2891</span> <span id="2892">2892</span> <span id="2893">2893</span> <span id="2894">2894</span> <span id="2895">2895</span> <span id="2896">2896</span> <span id="2897">2897</span> <span id="2898">2898</span> <span id="2899">2899</span> <span id="2900">2900</span> <span id="2901">2901</span> <span id="2902">2902</span> <span id="2903">2903</span> <span id="2904">2904</span> <span id="2905">2905</span> <span id="2906">2906</span> <span id="2907">2907</span> <span id="2908">2908</span> <span id="2909">2909</span> <span id="2910">2910</span> <span id="2911">2911</span> <span id="2912">2912</span> <span id="2913">2913</span> <span id="2914">2914</span> <span id="2915">2915</span> <span id="2916">2916</span> <span id="2917">2917</span> <span id="2918">2918</span> <span id="2919">2919</span> <span id="2920">2920</span> <span id="2921">2921</span> <span id="2922">2922</span> <span id="2923">2923</span> <span id="2924">2924</span> <span id="2925">2925</span> <span id="2926">2926</span> <span id="2927">2927</span> <span id="2928">2928</span> <span id="2929">2929</span> <span id="2930">2930</span> <span id="2931">2931</span> <span id="2932">2932</span> <span id="2933">2933</span> <span id="2934">2934</span> <span id="2935">2935</span> <span id="2936">2936</span> <span id="2937">2937</span> <span id="2938">2938</span> <span id="2939">2939</span> <span id="2940">2940</span> <span id="2941">2941</span> <span id="2942">2942</span> <span id="2943">2943</span> <span id="2944">2944</span> <span id="2945">2945</span> <span id="2946">2946</span> <span id="2947">2947</span> <span id="2948">2948</span> <span id="2949">2949</span> <span id="2950">2950</span> <span id="2951">2951</span> <span id="2952">2952</span> <span id="2953">2953</span> <span id="2954">2954</span> <span id="2955">2955</span> <span id="2956">2956</span> <span id="2957">2957</span> <span id="2958">2958</span> <span id="2959">2959</span> <span id="2960">2960</span> <span id="2961">2961</span> <span id="2962">2962</span> <span id="2963">2963</span> <span id="2964">2964</span> <span id="2965">2965</span> <span id="2966">2966</span> <span id="2967">2967</span> <span id="2968">2968</span> <span id="2969">2969</span> <span id="2970">2970</span> </pre><pre class="rust "> <span class="comment">// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="doccomment">//! A double-ended queue implemented with a growable ring buffer.</span> <span class="doccomment">//!</span> <span class="doccomment">//! This queue has `O(1)` amortized inserts and removals from both ends of the</span> <span class="doccomment">//! container. It also has `O(1)` indexing like a vector. The contained elements</span> <span class="doccomment">//! are not required to be copyable, and the queue will be sendable if the</span> <span class="doccomment">//! contained type is sendable.</span> <span class="attribute">#<span class="op">!</span>[<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">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="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>::{<span class="ident">repeat</span>, <span class="ident">FromIterator</span>, <span class="ident">FusedIterator</span>}; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">mem</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::{<span class="ident">Index</span>, <span class="ident">IndexMut</span>, <span class="ident">Place</span>, <span class="ident">Placer</span>, <span class="ident">InPlace</span>}; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>::<span class="ident">Shared</span>; <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">slice</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">cmp</span>; <span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">raw_vec</span>::<span class="ident">RawVec</span>; <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">range</span>::<span class="ident">RangeArgument</span>; <span class="kw">use</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="kw">super</span>::<span class="ident">vec</span>::<span class="ident">Vec</span>; <span class="kw">const</span> <span class="ident">INITIAL_CAPACITY</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">7</span>; <span class="comment">// 2^3 - 1</span> <span class="kw">const</span> <span class="ident">MINIMUM_CAPACITY</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span>; <span class="comment">// 2 - 1</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"32"</span>)]</span> <span class="kw">const</span> <span class="ident">MAXIMUM_ZST_CAPACITY</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><<</span> (<span class="number">32</span> <span class="op">-</span> <span class="number">1</span>); <span class="comment">// Largest possible power of two</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_pointer_width</span> <span class="op">=</span> <span class="string">"64"</span>)]</span> <span class="kw">const</span> <span class="ident">MAXIMUM_ZST_CAPACITY</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><<</span> (<span class="number">64</span> <span class="op">-</span> <span class="number">1</span>); <span class="comment">// Largest possible power of two</span> <span class="doccomment">/// A double-ended queue implemented with a growable ring buffer.</span> <span class="doccomment">///</span> <span class="doccomment">/// The "default" usage of this type as a queue is to use [`push_back`] to add to</span> <span class="doccomment">/// the queue, and [`pop_front`] to remove from the queue. [`extend`] and [`append`]</span> <span class="doccomment">/// push onto the back in this manner, and iterating over `VecDeque` goes front</span> <span class="doccomment">/// to back.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`push_back`]: #method.push_back</span> <span class="doccomment">/// [`pop_front`]: #method.pop_front</span> <span class="doccomment">/// [`extend`]: #method.extend</span> <span class="doccomment">/// [`append`]: #method.append</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">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="comment">// tail and head are pointers into the buffer. Tail always points</span> <span class="comment">// to the first element that could be read, Head always points</span> <span class="comment">// to where data should be written.</span> <span class="comment">// If tail == head the buffer is empty. The length of the ringbuffer</span> <span class="comment">// is defined as the distance between the two.</span> <span class="ident">tail</span>: <span class="ident">usize</span>, <span class="ident">head</span>: <span class="ident">usize</span>, <span class="ident">buf</span>: <span class="ident">RawVec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="attribute">#[<span class="ident">may_dangle</span>]</span> <span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</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">let</span> (<span class="ident">front</span>, <span class="ident">back</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_slices</span>(); <span class="kw">unsafe</span> { <span class="comment">// use drop for [T]</span> <span class="ident">ptr</span>::<span class="ident">drop_in_place</span>(<span class="ident">front</span>); <span class="ident">ptr</span>::<span class="ident">drop_in_place</span>(<span class="ident">back</span>); } <span class="comment">// RawVec handles deallocation</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// Creates an empty `VecDeque<T>`.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">VecDeque</span>::<span class="ident">new</span>() } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// Marginally more convenient</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">ptr</span>() } <span class="doccomment">/// Marginally more convenient</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">cap</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="kw">if</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">==</span> <span class="number">0</span> { <span class="comment">// For zero sized types, we are always at maximum capacity</span> <span class="ident">MAXIMUM_ZST_CAPACITY</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">cap</span>() } } <span class="doccomment">/// Turn ptr into a slice</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">buffer_as_slice</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] { <span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="self">self</span>.<span class="ident">ptr</span>(), <span class="self">self</span>.<span class="ident">cap</span>()) } <span class="doccomment">/// Turn ptr into a mut slice</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">buffer_as_mut_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="self">self</span>.<span class="ident">ptr</span>(), <span class="self">self</span>.<span class="ident">cap</span>()) } <span class="doccomment">/// Moves an element out of the buffer</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">buffer_read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">off</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">T</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">off</span> <span class="kw">as</span> <span class="ident">isize</span>)) } <span class="doccomment">/// Writes an element into the buffer, moving it.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">buffer_write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">off</span>: <span class="ident">usize</span>, <span class="ident">value</span>: <span class="ident">T</span>) { <span class="ident">ptr</span>::<span class="ident">write</span>(<span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">off</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">value</span>); } <span class="doccomment">/// Returns `true` if and only if the buffer is at full capacity.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">is_full</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">cap</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> } <span class="doccomment">/// Returns the index in the underlying buffer for a given logical element</span> <span class="doccomment">/// index.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">wrap_index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="ident">wrap_index</span>(<span class="ident">idx</span>, <span class="self">self</span>.<span class="ident">cap</span>()) } <span class="doccomment">/// Returns the index in the underlying buffer for a given logical element</span> <span class="doccomment">/// index + addend.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">wrap_add</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">addend</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="ident">wrap_index</span>(<span class="ident">idx</span>.<span class="ident">wrapping_add</span>(<span class="ident">addend</span>), <span class="self">self</span>.<span class="ident">cap</span>()) } <span class="doccomment">/// Returns the index in the underlying buffer for a given logical element</span> <span class="doccomment">/// index - subtrahend.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">wrap_sub</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">idx</span>: <span class="ident">usize</span>, <span class="ident">subtrahend</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="ident">wrap_index</span>(<span class="ident">idx</span>.<span class="ident">wrapping_sub</span>(<span class="ident">subtrahend</span>), <span class="self">self</span>.<span class="ident">cap</span>()) } <span class="doccomment">/// Copies a contiguous block of memory len long from src to dst</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">copy</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">dst</span>: <span class="ident">usize</span>, <span class="ident">src</span>: <span class="ident">usize</span>, <span class="ident">len</span>: <span class="ident">usize</span>) { <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">dst</span> <span class="op">+</span> <span class="ident">len</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">cap</span>(), <span class="string">"cpy dst={} src={} len={} cap={}"</span>, <span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">len</span>, <span class="self">self</span>.<span class="ident">cap</span>()); <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">src</span> <span class="op">+</span> <span class="ident">len</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">cap</span>(), <span class="string">"cpy dst={} src={} len={} cap={}"</span>, <span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">len</span>, <span class="self">self</span>.<span class="ident">cap</span>()); <span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">src</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">dst</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">len</span>); } <span class="doccomment">/// Copies a contiguous block of memory len long from src to dst</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">copy_nonoverlapping</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">dst</span>: <span class="ident">usize</span>, <span class="ident">src</span>: <span class="ident">usize</span>, <span class="ident">len</span>: <span class="ident">usize</span>) { <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">dst</span> <span class="op">+</span> <span class="ident">len</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">cap</span>(), <span class="string">"cno dst={} src={} len={} cap={}"</span>, <span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">len</span>, <span class="self">self</span>.<span class="ident">cap</span>()); <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">src</span> <span class="op">+</span> <span class="ident">len</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">cap</span>(), <span class="string">"cno dst={} src={} len={} cap={}"</span>, <span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">len</span>, <span class="self">self</span>.<span class="ident">cap</span>()); <span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">src</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">dst</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">len</span>); } <span class="doccomment">/// Copies a potentially wrapping block of memory len long from src to dest.</span> <span class="doccomment">/// (abs(dst - src) + len) must be no larger than cap() (There must be at</span> <span class="doccomment">/// most one continuous overlapping region between src and dest).</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">wrap_copy</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">dst</span>: <span class="ident">usize</span>, <span class="ident">src</span>: <span class="ident">usize</span>, <span class="ident">len</span>: <span class="ident">usize</span>) { <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span> <span class="kw">fn</span> <span class="ident">diff</span>(<span class="ident">a</span>: <span class="ident">usize</span>, <span class="ident">b</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="kw">if</span> <span class="ident">a</span> <span class="op"><=</span> <span class="ident">b</span> { <span class="ident">b</span> <span class="op">-</span> <span class="ident">a</span> } <span class="kw">else</span> { <span class="ident">a</span> <span class="op">-</span> <span class="ident">b</span> } } <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">diff</span>(<span class="ident">dst</span>, <span class="ident">src</span>), <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="ident">diff</span>(<span class="ident">dst</span>, <span class="ident">src</span>)) <span class="op">+</span> <span class="ident">len</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">cap</span>(), <span class="string">"wrc dst={} src={} len={} cap={}"</span>, <span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">len</span>, <span class="self">self</span>.<span class="ident">cap</span>()); <span class="kw">if</span> <span class="ident">src</span> <span class="op">==</span> <span class="ident">dst</span> <span class="op">||</span> <span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span>; } <span class="kw">let</span> <span class="ident">dst_after_src</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="ident">dst</span>, <span class="ident">src</span>) <span class="op"><</span> <span class="ident">len</span>; <span class="kw">let</span> <span class="ident">src_pre_wrap_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="ident">src</span>; <span class="kw">let</span> <span class="ident">dst_pre_wrap_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="ident">dst</span>; <span class="kw">let</span> <span class="ident">src_wraps</span> <span class="op">=</span> <span class="ident">src_pre_wrap_len</span> <span class="op"><</span> <span class="ident">len</span>; <span class="kw">let</span> <span class="ident">dst_wraps</span> <span class="op">=</span> <span class="ident">dst_pre_wrap_len</span> <span class="op"><</span> <span class="ident">len</span>; <span class="kw">match</span> (<span class="ident">dst_after_src</span>, <span class="ident">src_wraps</span>, <span class="ident">dst_wraps</span>) { (_, <span class="bool-val">false</span>, <span class="bool-val">false</span>) <span class="op">=></span> { <span class="comment">// src doesn't wrap, dst doesn't wrap</span> <span class="comment">//</span> <span class="comment">// S . . .</span> <span class="comment">// 1 [_ _ A A B B C C _]</span> <span class="comment">// 2 [_ _ A A A A B B _]</span> <span class="comment">// D . . .</span> <span class="comment">//</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">len</span>); } (<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="comment">// dst before src, src doesn't wrap, dst wraps</span> <span class="comment">//</span> <span class="comment">// S . . .</span> <span class="comment">// 1 [A A B B _ _ _ C C]</span> <span class="comment">// 2 [A A B B _ _ _ A A]</span> <span class="comment">// 3 [B B B B _ _ _ A A]</span> <span class="comment">// . . D .</span> <span class="comment">//</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">dst_pre_wrap_len</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">0</span>, <span class="ident">src</span> <span class="op">+</span> <span class="ident">dst_pre_wrap_len</span>, <span class="ident">len</span> <span class="op">-</span> <span class="ident">dst_pre_wrap_len</span>); } (<span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="comment">// src before dst, src doesn't wrap, dst wraps</span> <span class="comment">//</span> <span class="comment">// S . . .</span> <span class="comment">// 1 [C C _ _ _ A A B B]</span> <span class="comment">// 2 [B B _ _ _ A A B B]</span> <span class="comment">// 3 [B B _ _ _ A A A A]</span> <span class="comment">// . . D .</span> <span class="comment">//</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">0</span>, <span class="ident">src</span> <span class="op">+</span> <span class="ident">dst_pre_wrap_len</span>, <span class="ident">len</span> <span class="op">-</span> <span class="ident">dst_pre_wrap_len</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">dst_pre_wrap_len</span>); } (<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="op">=></span> { <span class="comment">// dst before src, src wraps, dst doesn't wrap</span> <span class="comment">//</span> <span class="comment">// . . S .</span> <span class="comment">// 1 [C C _ _ _ A A B B]</span> <span class="comment">// 2 [C C _ _ _ B B B B]</span> <span class="comment">// 3 [C C _ _ _ B B C C]</span> <span class="comment">// D . . .</span> <span class="comment">//</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">src_pre_wrap_len</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span> <span class="op">+</span> <span class="ident">src_pre_wrap_len</span>, <span class="number">0</span>, <span class="ident">len</span> <span class="op">-</span> <span class="ident">src_pre_wrap_len</span>); } (<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="op">=></span> { <span class="comment">// src before dst, src wraps, dst doesn't wrap</span> <span class="comment">//</span> <span class="comment">// . . S .</span> <span class="comment">// 1 [A A B B _ _ _ C C]</span> <span class="comment">// 2 [A A A A _ _ _ C C]</span> <span class="comment">// 3 [C C A A _ _ _ C C]</span> <span class="comment">// D . . .</span> <span class="comment">//</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span> <span class="op">+</span> <span class="ident">src_pre_wrap_len</span>, <span class="number">0</span>, <span class="ident">len</span> <span class="op">-</span> <span class="ident">src_pre_wrap_len</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">src_pre_wrap_len</span>); } (<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="comment">// dst before src, src wraps, dst wraps</span> <span class="comment">//</span> <span class="comment">// . . . S .</span> <span class="comment">// 1 [A B C D _ E F G H]</span> <span class="comment">// 2 [A B C D _ E G H H]</span> <span class="comment">// 3 [A B C D _ E G H A]</span> <span class="comment">// 4 [B C C D _ E G H A]</span> <span class="comment">// . . D . .</span> <span class="comment">//</span> <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">dst_pre_wrap_len</span> <span class="op">></span> <span class="ident">src_pre_wrap_len</span>); <span class="kw">let</span> <span class="ident">delta</span> <span class="op">=</span> <span class="ident">dst_pre_wrap_len</span> <span class="op">-</span> <span class="ident">src_pre_wrap_len</span>; <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">src_pre_wrap_len</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span> <span class="op">+</span> <span class="ident">src_pre_wrap_len</span>, <span class="number">0</span>, <span class="ident">delta</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">0</span>, <span class="ident">delta</span>, <span class="ident">len</span> <span class="op">-</span> <span class="ident">dst_pre_wrap_len</span>); } (<span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="comment">// src before dst, src wraps, dst wraps</span> <span class="comment">//</span> <span class="comment">// . . S . .</span> <span class="comment">// 1 [A B C D _ E F G H]</span> <span class="comment">// 2 [A A B D _ E F G H]</span> <span class="comment">// 3 [H A B D _ E F G H]</span> <span class="comment">// 4 [H A B D _ E F F G]</span> <span class="comment">// . . . D .</span> <span class="comment">//</span> <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">src_pre_wrap_len</span> <span class="op">></span> <span class="ident">dst_pre_wrap_len</span>); <span class="kw">let</span> <span class="ident">delta</span> <span class="op">=</span> <span class="ident">src_pre_wrap_len</span> <span class="op">-</span> <span class="ident">dst_pre_wrap_len</span>; <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">delta</span>, <span class="number">0</span>, <span class="ident">len</span> <span class="op">-</span> <span class="ident">src_pre_wrap_len</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">0</span>, <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="ident">delta</span>, <span class="ident">delta</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">dst</span>, <span class="ident">src</span>, <span class="ident">dst_pre_wrap_len</span>); } } } <span class="doccomment">/// Frobs the head and tail sections around to handle the fact that we</span> <span class="doccomment">/// just reallocated. Unsafe because it trusts old_cap.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">handle_cap_increase</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">old_cap</span>: <span class="ident">usize</span>) { <span class="kw">let</span> <span class="ident">new_cap</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cap</span>(); <span class="comment">// Move the shortest contiguous section of the ring buffer</span> <span class="comment">// T H</span> <span class="comment">// [o o o o o o o . ]</span> <span class="comment">// T H</span> <span class="comment">// A [o o o o o o o . . . . . . . . . ]</span> <span class="comment">// H T</span> <span class="comment">// [o o . o o o o o ]</span> <span class="comment">// T H</span> <span class="comment">// B [. . . o o o o o o o . . . . . . ]</span> <span class="comment">// H T</span> <span class="comment">// [o o o o o . o o ]</span> <span class="comment">// H T</span> <span class="comment">// C [o o o o o . . . . . . . . . o o ]</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">head</span> { <span class="comment">// A</span> <span class="comment">// Nop</span> } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">head</span> <span class="op"><</span> <span class="ident">old_cap</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">tail</span> { <span class="comment">// B</span> <span class="self">self</span>.<span class="ident">copy_nonoverlapping</span>(<span class="ident">old_cap</span>, <span class="number">0</span>, <span class="self">self</span>.<span class="ident">head</span>); <span class="self">self</span>.<span class="ident">head</span> <span class="op">+=</span> <span class="ident">old_cap</span>; <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">head</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">tail</span>); } <span class="kw">else</span> { <span class="comment">// C</span> <span class="kw">let</span> <span class="ident">new_tail</span> <span class="op">=</span> <span class="ident">new_cap</span> <span class="op">-</span> (<span class="ident">old_cap</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">tail</span>); <span class="self">self</span>.<span class="ident">copy_nonoverlapping</span>(<span class="ident">new_tail</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">old_cap</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">tail</span>); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">new_tail</span>; <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">head</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">tail</span>); } <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">head</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">cap</span>()); <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">cap</span>()); <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">cap</span>().<span class="ident">count_ones</span>() <span class="op">==</span> <span class="number">1</span>); } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// Creates an empty `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let vector: VecDeque<u32> = VecDeque::new();</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">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="ident">INITIAL_CAPACITY</span>) } <span class="doccomment">/// Creates an empty `VecDeque` with space for at least `n` elements.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let vector: VecDeque<u32> = VecDeque::with_capacity(10);</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">with_capacity</span>(<span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="comment">// +1 since the ringbuffer always leaves one space empty</span> <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">max</span>(<span class="ident">n</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">MINIMUM_CAPACITY</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">next_power_of_two</span>(); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">cap</span> <span class="op">></span> <span class="ident">n</span>, <span class="string">"capacity overflow"</span>); <span class="ident">VecDeque</span> { <span class="ident">tail</span>: <span class="number">0</span>, <span class="ident">head</span>: <span class="number">0</span>, <span class="ident">buf</span>: <span class="ident">RawVec</span>::<span class="ident">with_capacity</span>(<span class="ident">cap</span>), } } <span class="doccomment">/// Retrieves an element in the `VecDeque` by index.</span> <span class="doccomment">///</span> <span class="doccomment">/// Element at index 0 is the front of the queue.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// buf.push_back(4);</span> <span class="doccomment">/// buf.push_back(5);</span> <span class="doccomment">/// assert_eq!(buf.get(1), Some(&4));</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="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">index</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">len</span>() { <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">index</span>); <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">idx</span> <span class="kw">as</span> <span class="ident">isize</span>)) } } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="doccomment">/// Retrieves an element in the `VecDeque` mutably by index.</span> <span class="doccomment">///</span> <span class="doccomment">/// Element at index 0 is the front of the queue.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// buf.push_back(4);</span> <span class="doccomment">/// buf.push_back(5);</span> <span class="doccomment">/// if let Some(elem) = buf.get_mut(1) {</span> <span class="doccomment">/// *elem = 7;</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(buf[1], 7);</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="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">index</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">len</span>() { <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">index</span>); <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">idx</span> <span class="kw">as</span> <span class="ident">isize</span>)) } } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="doccomment">/// Swaps elements at indices `i` and `j`.</span> <span class="doccomment">///</span> <span class="doccomment">/// `i` and `j` may be equal.</span> <span class="doccomment">///</span> <span class="doccomment">/// Fails if there is no element with either index.</span> <span class="doccomment">///</span> <span class="doccomment">/// Element at index 0 is the front of the queue.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// buf.push_back(4);</span> <span class="doccomment">/// buf.push_back(5);</span> <span class="doccomment">/// assert_eq!(buf, [3, 4, 5]);</span> <span class="doccomment">/// buf.swap(0, 2);</span> <span class="doccomment">/// assert_eq!(buf, [5, 4, 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">swap</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>, <span class="ident">j</span>: <span class="ident">usize</span>) { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">i</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">len</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">j</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">len</span>()); <span class="kw">let</span> <span class="ident">ri</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">i</span>); <span class="kw">let</span> <span class="ident">rj</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">j</span>); <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">ri</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="self">self</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">rj</span> <span class="kw">as</span> <span class="ident">isize</span>)) } } <span class="doccomment">/// Returns the number of elements the `VecDeque` can hold without</span> <span class="doccomment">/// reallocating.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let buf: VecDeque<i32> = VecDeque::with_capacity(10);</span> <span class="doccomment">/// assert!(buf.capacity() >= 10);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">capacity</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">cap</span>() <span class="op">-</span> <span class="number">1</span> } <span class="doccomment">/// Reserves the minimum capacity for exactly `additional` more elements to be inserted in the</span> <span class="doccomment">/// given `VecDeque`. Does nothing if the capacity is already sufficient.</span> <span class="doccomment">///</span> <span class="doccomment">/// Note that the allocator may give the collection more space than it requests. Therefore</span> <span class="doccomment">/// capacity can not be relied upon to be precisely minimal. Prefer [`reserve`] if future</span> <span class="doccomment">/// insertions are expected.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if the new capacity overflows `usize`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf: VecDeque<i32> = vec![1].into_iter().collect();</span> <span class="doccomment">/// buf.reserve_exact(10);</span> <span class="doccomment">/// assert!(buf.capacity() >= 11);</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// [`reserve`]: #method.reserve</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">reserve_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">additional</span>: <span class="ident">usize</span>) { <span class="self">self</span>.<span class="ident">reserve</span>(<span class="ident">additional</span>); } <span class="doccomment">/// Reserves capacity for at least `additional` more elements to be inserted in the given</span> <span class="doccomment">/// `VecDeque`. The collection may reserve more space to avoid frequent reallocations.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if the new capacity overflows `usize`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf: VecDeque<i32> = vec![1].into_iter().collect();</span> <span class="doccomment">/// buf.reserve(10);</span> <span class="doccomment">/// assert!(buf.capacity() >= 11);</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">reserve</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">additional</span>: <span class="ident">usize</span>) { <span class="kw">let</span> <span class="ident">old_cap</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cap</span>(); <span class="kw">let</span> <span class="ident">used_cap</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>; <span class="kw">let</span> <span class="ident">new_cap</span> <span class="op">=</span> <span class="ident">used_cap</span>.<span class="ident">checked_add</span>(<span class="ident">additional</span>) .<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">needed_cap</span><span class="op">|</span> <span class="ident">needed_cap</span>.<span class="ident">checked_next_power_of_two</span>()) .<span class="ident">expect</span>(<span class="string">"capacity overflow"</span>); <span class="kw">if</span> <span class="ident">new_cap</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">capacity</span>() { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">reserve_exact</span>(<span class="ident">used_cap</span>, <span class="ident">new_cap</span> <span class="op">-</span> <span class="ident">used_cap</span>); <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">handle_cap_increase</span>(<span class="ident">old_cap</span>); } } } <span class="doccomment">/// Shrinks the capacity of the `VecDeque` as much as possible.</span> <span class="doccomment">///</span> <span class="doccomment">/// It will drop down as close as possible to the length but the allocator may still inform the</span> <span class="doccomment">/// `VecDeque` that there is space for a few more elements.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::with_capacity(15);</span> <span class="doccomment">/// buf.extend(0..4);</span> <span class="doccomment">/// assert_eq!(buf.capacity(), 15);</span> <span class="doccomment">/// buf.shrink_to_fit();</span> <span class="doccomment">/// assert!(buf.capacity() >= 4);</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">"deque_extras_15"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shrink_to_fit</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="comment">// +1 since the ringbuffer always leaves one space empty</span> <span class="comment">// len + 1 can't overflow for an existing, well-formed ringbuffer.</span> <span class="kw">let</span> <span class="ident">target_cap</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">max</span>(<span class="self">self</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>, <span class="ident">MINIMUM_CAPACITY</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">next_power_of_two</span>(); <span class="kw">if</span> <span class="ident">target_cap</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">cap</span>() { <span class="comment">// There are three cases of interest:</span> <span class="comment">// All elements are out of desired bounds</span> <span class="comment">// Elements are contiguous, and head is out of desired bounds</span> <span class="comment">// Elements are discontiguous, and tail is out of desired bounds</span> <span class="comment">//</span> <span class="comment">// At all other times, element positions are unaffected.</span> <span class="comment">//</span> <span class="comment">// Indicates that elements at the head should be moved.</span> <span class="kw">let</span> <span class="ident">head_outside</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">head</span> <span class="op">==</span> <span class="number">0</span> <span class="op">||</span> <span class="self">self</span>.<span class="ident">head</span> <span class="op">>=</span> <span class="ident">target_cap</span>; <span class="comment">// Move elements from out of desired bounds (positions after target_cap)</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">>=</span> <span class="ident">target_cap</span> <span class="op">&&</span> <span class="ident">head_outside</span> { <span class="comment">// T H</span> <span class="comment">// [. . . . . . . . o o o o o o o . ]</span> <span class="comment">// T H</span> <span class="comment">// [o o o o o o o . ]</span> <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">copy_nonoverlapping</span>(<span class="number">0</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="self">self</span>.<span class="ident">len</span>()); } <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="number">0</span>; } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">!=</span> <span class="number">0</span> <span class="op">&&</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="ident">target_cap</span> <span class="op">&&</span> <span class="ident">head_outside</span> { <span class="comment">// T H</span> <span class="comment">// [. . . o o o o o o o . . . . . . ]</span> <span class="comment">// H T</span> <span class="comment">// [o o . o o o o o ]</span> <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">head</span>, <span class="ident">target_cap</span>); <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">copy_nonoverlapping</span>(<span class="number">0</span>, <span class="ident">target_cap</span>, <span class="ident">len</span>); } <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">len</span>; <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">head</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">tail</span>); } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">>=</span> <span class="ident">target_cap</span> { <span class="comment">// H T</span> <span class="comment">// [o o o o o . . . . . . . . . o o ]</span> <span class="comment">// H T</span> <span class="comment">// [o o o o o . o o ]</span> <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">head</span>, <span class="number">1</span>) <span class="op"><</span> <span class="ident">target_cap</span>); <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">tail</span>; <span class="kw">let</span> <span class="ident">new_tail</span> <span class="op">=</span> <span class="ident">target_cap</span> <span class="op">-</span> <span class="ident">len</span>; <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">copy_nonoverlapping</span>(<span class="ident">new_tail</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">len</span>); } <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">new_tail</span>; <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">head</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">tail</span>); } <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">shrink_to_fit</span>(<span class="ident">target_cap</span>); <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">head</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">cap</span>()); <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">cap</span>()); <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">cap</span>().<span class="ident">count_ones</span>() <span class="op">==</span> <span class="number">1</span>); } } <span class="doccomment">/// Shortens the `VecDeque`, dropping excess elements from the back.</span> <span class="doccomment">///</span> <span class="doccomment">/// If `len` is greater than the `VecDeque`'s current length, this has no</span> <span class="doccomment">/// effect.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(5);</span> <span class="doccomment">/// buf.push_back(10);</span> <span class="doccomment">/// buf.push_back(15);</span> <span class="doccomment">/// assert_eq!(buf, [5, 10, 15]);</span> <span class="doccomment">/// buf.truncate(1);</span> <span class="doccomment">/// assert_eq!(buf, [5]);</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">"deque_extras"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">truncate</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>) { <span class="kw">for</span> _ <span class="kw">in</span> <span class="ident">len</span>..<span class="self">self</span>.<span class="ident">len</span>() { <span class="self">self</span>.<span class="ident">pop_back</span>(); } } <span class="doccomment">/// Returns a front-to-back iterator.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(5);</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// buf.push_back(4);</span> <span class="doccomment">/// let b: &[_] = &[&5, &3, &4];</span> <span class="doccomment">/// let c: Vec<&i32> = buf.iter().collect();</span> <span class="doccomment">/// assert_eq!(&c[..], b);</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">T</span><span class="op">></span> { <span class="ident">Iter</span> { <span class="ident">tail</span>: <span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">head</span>: <span class="self">self</span>.<span class="ident">head</span>, <span class="ident">ring</span>: <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">buffer_as_slice</span>() }, } } <span class="doccomment">/// Returns a front-to-back iterator that returns mutable references.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(5);</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// buf.push_back(4);</span> <span class="doccomment">/// for num in buf.iter_mut() {</span> <span class="doccomment">/// *num = *num - 2;</span> <span class="doccomment">/// }</span> <span class="doccomment">/// let b: &[_] = &[&mut 3, &mut 1, &mut 2];</span> <span class="doccomment">/// assert_eq!(&buf.iter_mut().collect::<Vec<&mut i32>>()[..], b);</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">T</span><span class="op">></span> { <span class="ident">IterMut</span> { <span class="ident">tail</span>: <span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">head</span>: <span class="self">self</span>.<span class="ident">head</span>, <span class="ident">ring</span>: <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">buffer_as_mut_slice</span>() }, } } <span class="doccomment">/// Returns a pair of slices which contain, in order, the contents of the</span> <span class="doccomment">/// `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut vector = VecDeque::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// vector.push_back(0);</span> <span class="doccomment">/// vector.push_back(1);</span> <span class="doccomment">/// vector.push_back(2);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(vector.as_slices(), (&[0, 1, 2][..], &[][..]));</span> <span class="doccomment">///</span> <span class="doccomment">/// vector.push_front(10);</span> <span class="doccomment">/// vector.push_front(9);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(vector.as_slices(), (&[9, 10][..], &[0, 1, 2][..]));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"deque_extras_15"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_slices</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="kw-2">&</span>[<span class="ident">T</span>], <span class="kw-2">&</span>[<span class="ident">T</span>]) { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer_as_slice</span>(); <span class="ident">RingSlices</span>::<span class="ident">ring_slices</span>(<span class="ident">buf</span>, <span class="self">self</span>.<span class="ident">head</span>, <span class="self">self</span>.<span class="ident">tail</span>) } } <span class="doccomment">/// Returns a pair of slices which contain, in order, the contents of the</span> <span class="doccomment">/// `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut vector = VecDeque::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// vector.push_back(0);</span> <span class="doccomment">/// vector.push_back(1);</span> <span class="doccomment">///</span> <span class="doccomment">/// vector.push_front(10);</span> <span class="doccomment">/// vector.push_front(9);</span> <span class="doccomment">///</span> <span class="doccomment">/// vector.as_mut_slices().0[0] = 42;</span> <span class="doccomment">/// vector.as_mut_slices().1[0] = 24;</span> <span class="doccomment">/// assert_eq!(vector.as_slices(), (&[42, 10][..], &[24, 1][..]));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"deque_extras_15"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_slices</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> (<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>]) { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">head</span>; <span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail</span>; <span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buffer_as_mut_slice</span>(); <span class="ident">RingSlices</span>::<span class="ident">ring_slices</span>(<span class="ident">buf</span>, <span class="ident">head</span>, <span class="ident">tail</span>) } } <span class="doccomment">/// Returns the number of elements in the `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut v = VecDeque::new();</span> <span class="doccomment">/// assert_eq!(v.len(), 0);</span> <span class="doccomment">/// v.push_back(1);</span> <span class="doccomment">/// assert_eq!(v.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="ident">count</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="self">self</span>.<span class="ident">head</span>, <span class="self">self</span>.<span class="ident">cap</span>()) } <span class="doccomment">/// Returns `true` if the `VecDeque` is 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::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut v = VecDeque::new();</span> <span class="doccomment">/// assert!(v.is_empty());</span> <span class="doccomment">/// v.push_front(1);</span> <span class="doccomment">/// assert!(!v.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">tail</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">head</span> } <span class="doccomment">/// Create a draining iterator that removes the specified range in the</span> <span class="doccomment">/// `VecDeque` and yields the removed items.</span> <span class="doccomment">///</span> <span class="doccomment">/// Note 1: The element range is removed even if the iterator is not</span> <span class="doccomment">/// consumed until the end.</span> <span class="doccomment">///</span> <span class="doccomment">/// Note 2: It is unspecified how many elements are removed from the deque,</span> <span class="doccomment">/// if the `Drain` value is not dropped, but the borrow it holds expires</span> <span class="doccomment">/// (eg. due to mem::forget).</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if the starting point is greater than the end point or if</span> <span class="doccomment">/// the end point is greater than the length of the vector.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut v: VecDeque<_> = vec![1, 2, 3].into_iter().collect();</span> <span class="doccomment">/// let drained = v.drain(2..).collect::<VecDeque<_>>();</span> <span class="doccomment">/// assert_eq!(drained, [3]);</span> <span class="doccomment">/// assert_eq!(v, [1, 2]);</span> <span class="doccomment">///</span> <span class="doccomment">/// // A full range clears all contents</span> <span class="doccomment">/// v.drain(..);</span> <span class="doccomment">/// assert!(v.is_empty());</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">drain</span><span class="op"><</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">Drain</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RangeArgument</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="comment">// Memory safety</span> <span class="comment">//</span> <span class="comment">// When the Drain is first created, the source deque is shortened to</span> <span class="comment">// make sure no uninitialized or moved-from elements are accessible at</span> <span class="comment">// all if the Drain's destructor never gets to run.</span> <span class="comment">//</span> <span class="comment">// Drain will ptr::read out the values to remove.</span> <span class="comment">// When finished, the remaining data will be copied back to cover the hole,</span> <span class="comment">// and the head/tail values will be restored correctly.</span> <span class="comment">//</span> <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">range</span>.<span class="ident">start</span>() { <span class="ident">Included</span>(<span class="kw-2">&</span><span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>, <span class="ident">Excluded</span>(<span class="kw-2">&</span><span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">Unbounded</span> <span class="op">=></span> <span class="number">0</span>, }; <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">range</span>.<span class="ident">end</span>() { <span class="ident">Included</span>(<span class="kw-2">&</span><span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">Excluded</span>(<span class="kw-2">&</span><span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>, <span class="ident">Unbounded</span> <span class="op">=></span> <span class="ident">len</span>, }; <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">start</span> <span class="op"><=</span> <span class="ident">end</span>, <span class="string">"drain lower bound was too large"</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">end</span> <span class="op"><=</span> <span class="ident">len</span>, <span class="string">"drain upper bound was too large"</span>); <span class="comment">// The deque's elements are parted into three segments:</span> <span class="comment">// * self.tail -> drain_tail</span> <span class="comment">// * drain_tail -> drain_head</span> <span class="comment">// * drain_head -> self.head</span> <span class="comment">//</span> <span class="comment">// T = self.tail; H = self.head; t = drain_tail; h = drain_head</span> <span class="comment">//</span> <span class="comment">// We store drain_tail as self.head, and drain_head and self.head as</span> <span class="comment">// after_tail and after_head respectively on the Drain. This also</span> <span class="comment">// truncates the effective array such that if the Drain is leaked, we</span> <span class="comment">// have forgotten about the potentially moved values after the start of</span> <span class="comment">// the drain.</span> <span class="comment">//</span> <span class="comment">// T t h H</span> <span class="comment">// [. . . o o x x o o . . .]</span> <span class="comment">//</span> <span class="kw">let</span> <span class="ident">drain_tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">start</span>); <span class="kw">let</span> <span class="ident">drain_head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">end</span>); <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">head</span>; <span class="comment">// "forget" about the values after the start of the drain until after</span> <span class="comment">// the drain is complete and the Drain destructor is run.</span> <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">drain_tail</span>; <span class="ident">Drain</span> { <span class="ident">deque</span>: <span class="kw">unsafe</span> { <span class="ident">Shared</span>::<span class="ident">new</span>(<span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _) }, <span class="ident">after_tail</span>: <span class="ident">drain_head</span>, <span class="ident">after_head</span>: <span class="ident">head</span>, <span class="ident">iter</span>: <span class="ident">Iter</span> { <span class="ident">tail</span>: <span class="ident">drain_tail</span>, <span class="ident">head</span>: <span class="ident">drain_head</span>, <span class="ident">ring</span>: <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">buffer_as_mut_slice</span>() }, }, } } <span class="doccomment">/// Clears the buffer, removing all values.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut v = VecDeque::new();</span> <span class="doccomment">/// v.push_back(1);</span> <span class="doccomment">/// v.clear();</span> <span class="doccomment">/// assert!(v.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="attribute">#[<span class="ident">inline</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="self">self</span>.<span class="ident">drain</span>(..); } <span class="doccomment">/// Returns `true` if the `VecDeque` contains an element equal to the</span> <span class="doccomment">/// given 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::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut vector: VecDeque<u32> = VecDeque::new();</span> <span class="doccomment">///</span> <span class="doccomment">/// vector.push_back(0);</span> <span class="doccomment">/// vector.push_back(1);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(vector.contains(&1), true);</span> <span class="doccomment">/// assert_eq!(vector.contains(&10), 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">"vec_deque_contains"</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">contains</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_slices</span>(); <span class="ident">a</span>.<span class="ident">contains</span>(<span class="ident">x</span>) <span class="op">||</span> <span class="ident">b</span>.<span class="ident">contains</span>(<span class="ident">x</span>) } <span class="doccomment">/// Provides a reference to the front element, or `None` if the `VecDeque` is</span> <span class="doccomment">/// 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::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut d = VecDeque::new();</span> <span class="doccomment">/// assert_eq!(d.front(), None);</span> <span class="doccomment">///</span> <span class="doccomment">/// d.push_back(1);</span> <span class="doccomment">/// d.push_back(2);</span> <span class="doccomment">/// assert_eq!(d.front(), Some(&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">front</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="number">0</span>]) } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="doccomment">/// Provides a mutable reference to the front element, or `None` if the</span> <span class="doccomment">/// `VecDeque` is 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::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut d = VecDeque::new();</span> <span class="doccomment">/// assert_eq!(d.front_mut(), None);</span> <span class="doccomment">///</span> <span class="doccomment">/// d.push_back(1);</span> <span class="doccomment">/// d.push_back(2);</span> <span class="doccomment">/// match d.front_mut() {</span> <span class="doccomment">/// Some(x) => *x = 9,</span> <span class="doccomment">/// None => (),</span> <span class="doccomment">/// }</span> <span class="doccomment">/// assert_eq!(d.front(), Some(&9));</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">front_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[<span class="number">0</span>]) } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="doccomment">/// Provides a reference to the back element, or `None` if the `VecDeque` is</span> <span class="doccomment">/// 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::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut d = VecDeque::new();</span> <span class="doccomment">/// assert_eq!(d.back(), None);</span> <span class="doccomment">///</span> <span class="doccomment">/// d.push_back(1);</span> <span class="doccomment">/// d.push_back(2);</span> <span class="doccomment">/// assert_eq!(d.back(), Some(&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">back</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>]) } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="doccomment">/// Provides a mutable reference to the back element, or `None` if the</span> <span class="doccomment">/// `VecDeque` is 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::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut d = VecDeque::new();</span> <span class="doccomment">/// assert_eq!(d.back(), None);</span> <span class="doccomment">///</span> <span class="doccomment">/// d.push_back(1);</span> <span class="doccomment">/// d.push_back(2);</span> <span class="doccomment">/// match d.back_mut() {</span> <span class="doccomment">/// Some(x) => *x = 9,</span> <span class="doccomment">/// None => (),</span> <span class="doccomment">/// }</span> <span class="doccomment">/// assert_eq!(d.back(), Some(&9));</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">back_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>]) } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="doccomment">/// Removes the first element and returns it, or `None` if the `VecDeque` is</span> <span class="doccomment">/// 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::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut d = VecDeque::new();</span> <span class="doccomment">/// d.push_back(1);</span> <span class="doccomment">/// d.push_back(2);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(d.pop_front(), Some(1));</span> <span class="doccomment">/// assert_eq!(d.pop_front(), Some(2));</span> <span class="doccomment">/// assert_eq!(d.pop_front(), 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">pop_front</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail</span>; <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</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">buffer_read</span>(<span class="ident">tail</span>)) } } } <span class="doccomment">/// Prepends an element to the `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut d = VecDeque::new();</span> <span class="doccomment">/// d.push_front(1);</span> <span class="doccomment">/// d.push_front(2);</span> <span class="doccomment">/// assert_eq!(d.front(), Some(&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">push_front</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">T</span>) { <span class="self">self</span>.<span class="ident">grow_if_necessary</span>(); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="number">1</span>); <span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail</span>; <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">buffer_write</span>(<span class="ident">tail</span>, <span class="ident">value</span>); } } <span class="doccomment">/// Appends an element to the back of the `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(1);</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// assert_eq!(3, *buf.back().unwrap());</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">push_back</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">T</span>) { <span class="self">self</span>.<span class="ident">grow_if_necessary</span>(); <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">head</span>; <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">head</span>, <span class="number">1</span>); <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">buffer_write</span>(<span class="ident">head</span>, <span class="ident">value</span>) } } <span class="doccomment">/// Removes the last element from the `VecDeque` and returns it, or `None` if</span> <span class="doccomment">/// it is 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::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// assert_eq!(buf.pop_back(), None);</span> <span class="doccomment">/// buf.push_back(1);</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// assert_eq!(buf.pop_back(), Some(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">pop_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">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() { <span class="prelude-val">None</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">head</span>, <span class="number">1</span>); <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">head</span>; <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">buffer_read</span>(<span class="ident">head</span>)) } } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">is_contiguous</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">tail</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">head</span> } <span class="doccomment">/// Removes an element from anywhere in the `VecDeque` and returns it, replacing it with the</span> <span class="doccomment">/// last element.</span> <span class="doccomment">///</span> <span class="doccomment">/// This does not preserve ordering, but is O(1).</span> <span class="doccomment">///</span> <span class="doccomment">/// Returns `None` if `index` is out of bounds.</span> <span class="doccomment">///</span> <span class="doccomment">/// Element at index 0 is the front of the queue.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// assert_eq!(buf.swap_remove_back(0), None);</span> <span class="doccomment">/// buf.push_back(1);</span> <span class="doccomment">/// buf.push_back(2);</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// assert_eq!(buf, [1, 2, 3]);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(buf.swap_remove_back(0), Some(1));</span> <span class="doccomment">/// assert_eq!(buf, [3, 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">"deque_extras_15"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap_remove_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">length</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">length</span> <span class="op">></span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">index</span> <span class="op"><</span> <span class="ident">length</span> <span class="op">-</span> <span class="number">1</span> { <span class="self">self</span>.<span class="ident">swap</span>(<span class="ident">index</span>, <span class="ident">length</span> <span class="op">-</span> <span class="number">1</span>); } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">index</span> <span class="op">>=</span> <span class="ident">length</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="self">self</span>.<span class="ident">pop_back</span>() } <span class="doccomment">/// Removes an element from anywhere in the `VecDeque` and returns it,</span> <span class="doccomment">/// replacing it with the first element.</span> <span class="doccomment">///</span> <span class="doccomment">/// This does not preserve ordering, but is O(1).</span> <span class="doccomment">///</span> <span class="doccomment">/// Returns `None` if `index` is out of bounds.</span> <span class="doccomment">///</span> <span class="doccomment">/// Element at index 0 is the front of the queue.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// assert_eq!(buf.swap_remove_front(0), None);</span> <span class="doccomment">/// buf.push_back(1);</span> <span class="doccomment">/// buf.push_back(2);</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// assert_eq!(buf, [1, 2, 3]);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(buf.swap_remove_front(2), Some(3));</span> <span class="doccomment">/// assert_eq!(buf, [2, 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">"deque_extras_15"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap_remove_front</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">length</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">length</span> <span class="op">></span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">index</span> <span class="op"><</span> <span class="ident">length</span> <span class="op">&&</span> <span class="ident">index</span> <span class="op">!=</span> <span class="number">0</span> { <span class="self">self</span>.<span class="ident">swap</span>(<span class="ident">index</span>, <span class="number">0</span>); } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">index</span> <span class="op">>=</span> <span class="ident">length</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="self">self</span>.<span class="ident">pop_front</span>() } <span class="doccomment">/// Inserts an element at `index` within the `VecDeque`, shifting all elements with indices</span> <span class="doccomment">/// greater than or equal to `index` towards the back.</span> <span class="doccomment">///</span> <span class="doccomment">/// Element at index 0 is the front of the queue.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if `index` is greater than `VecDeque`'s length</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut vec_deque = VecDeque::new();</span> <span class="doccomment">/// vec_deque.push_back('a');</span> <span class="doccomment">/// vec_deque.push_back('b');</span> <span class="doccomment">/// vec_deque.push_back('c');</span> <span class="doccomment">/// assert_eq!(vec_deque, &['a', 'b', 'c']);</span> <span class="doccomment">///</span> <span class="doccomment">/// vec_deque.insert(1, 'd');</span> <span class="doccomment">/// assert_eq!(vec_deque, &['a', 'd', 'b', '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">"deque_extras_15"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</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">index</span>: <span class="ident">usize</span>, <span class="ident">value</span>: <span class="ident">T</span>) { <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">index</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">len</span>(), <span class="string">"index out of bounds"</span>); <span class="self">self</span>.<span class="ident">grow_if_necessary</span>(); <span class="comment">// Move the least number of elements in the ring buffer and insert</span> <span class="comment">// the given object</span> <span class="comment">//</span> <span class="comment">// At most len/2 - 1 elements will be moved. O(min(n, n-i))</span> <span class="comment">//</span> <span class="comment">// There are three main cases:</span> <span class="comment">// Elements are contiguous</span> <span class="comment">// - special case when tail is 0</span> <span class="comment">// Elements are discontiguous and the insert is in the tail section</span> <span class="comment">// Elements are discontiguous and the insert is in the head section</span> <span class="comment">//</span> <span class="comment">// For each of those there are two more cases:</span> <span class="comment">// Insert is closer to tail</span> <span class="comment">// Insert is closer to head</span> <span class="comment">//</span> <span class="comment">// Key: H - self.head</span> <span class="comment">// T - self.tail</span> <span class="comment">// o - Valid element</span> <span class="comment">// I - Insertion element</span> <span class="comment">// A - The element that should be after the insertion point</span> <span class="comment">// M - Indicates element was moved</span> <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">index</span>); <span class="kw">let</span> <span class="ident">distance_to_tail</span> <span class="op">=</span> <span class="ident">index</span>; <span class="kw">let</span> <span class="ident">distance_to_head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">index</span>; <span class="kw">let</span> <span class="ident">contiguous</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">is_contiguous</span>(); <span class="kw">match</span> (<span class="ident">contiguous</span>, <span class="ident">distance_to_tail</span> <span class="op"><=</span> <span class="ident">distance_to_head</span>, <span class="ident">idx</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">tail</span>) { (<span class="bool-val">true</span>, <span class="bool-val">true</span>, _) <span class="kw">if</span> <span class="ident">index</span> <span class="op">==</span> <span class="number">0</span> <span class="op">=></span> { <span class="comment">// push_front</span> <span class="comment">//</span> <span class="comment">// T</span> <span class="comment">// I H</span> <span class="comment">// [A o o o o o o . . . . . . . . .]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [A o o o o o o o . . . . . I]</span> <span class="comment">//</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="number">1</span>); } (<span class="bool-val">true</span>, <span class="bool-val">true</span>, _) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// contiguous, insert closer to tail:</span> <span class="comment">//</span> <span class="comment">// T I H</span> <span class="comment">// [. . . o o A o o o o . . . . . .]</span> <span class="comment">//</span> <span class="comment">// T H</span> <span class="comment">// [. . o o I A o o o o . . . . . .]</span> <span class="comment">// M M</span> <span class="comment">//</span> <span class="comment">// contiguous, insert closer to tail and tail is 0:</span> <span class="comment">//</span> <span class="comment">//</span> <span class="comment">// T I H</span> <span class="comment">// [o o A o o o o . . . . . . . . .]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o I A o o o o o . . . . . . . o]</span> <span class="comment">// M M</span> <span class="kw">let</span> <span class="ident">new_tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="number">1</span>); <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">new_tail</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="number">1</span>); <span class="comment">// Already moved the tail, so we only copy `index - 1` elements.</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="self">self</span>.<span class="ident">tail</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">index</span> <span class="op">-</span> <span class="number">1</span>); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">new_tail</span>; } } (<span class="bool-val">true</span>, <span class="bool-val">false</span>, _) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// contiguous, insert closer to head:</span> <span class="comment">//</span> <span class="comment">// T I H</span> <span class="comment">// [. . . o o o o A o o . . . . . .]</span> <span class="comment">//</span> <span class="comment">// T H</span> <span class="comment">// [. . . o o o o I A o o . . . . .]</span> <span class="comment">// M M M</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">idx</span>, <span class="self">self</span>.<span class="ident">head</span> <span class="op">-</span> <span class="ident">idx</span>); <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">head</span>, <span class="number">1</span>); } } (<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, insert closer to tail, tail section:</span> <span class="comment">//</span> <span class="comment">// H T I</span> <span class="comment">// [o o o o o o . . . . . o o A o o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o o o o o o . . . . o o I A o o]</span> <span class="comment">// M M</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">tail</span> <span class="op">-</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">index</span>); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">-=</span> <span class="number">1</span>; } } (<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, insert closer to head, tail section:</span> <span class="comment">//</span> <span class="comment">// H T I</span> <span class="comment">// [o o . . . . . . . o o o o o A o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o o o . . . . . . o o o o o I A]</span> <span class="comment">// M M M M</span> <span class="comment">// copy elements up to new head</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">1</span>, <span class="number">0</span>, <span class="self">self</span>.<span class="ident">head</span>); <span class="comment">// copy last element into empty spot at bottom of buffer</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">0</span>, <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="number">1</span>, <span class="number">1</span>); <span class="comment">// move elements from idx to end forward not including ^ element</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">idx</span>, <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="number">1</span> <span class="op">-</span> <span class="ident">idx</span>); <span class="self">self</span>.<span class="ident">head</span> <span class="op">+=</span> <span class="number">1</span>; } } (<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="kw">if</span> <span class="ident">idx</span> <span class="op">==</span> <span class="number">0</span> <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, insert is closer to tail, head section,</span> <span class="comment">// and is at index zero in the internal buffer:</span> <span class="comment">//</span> <span class="comment">// I H T</span> <span class="comment">// [A o o o o o o o o o . . . o o o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [A o o o o o o o o o . . o o o I]</span> <span class="comment">// M M M</span> <span class="comment">// copy elements up to new tail</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">tail</span> <span class="op">-</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">tail</span>); <span class="comment">// copy last element into empty spot at bottom of buffer</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="number">1</span>, <span class="number">0</span>, <span class="number">1</span>); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">-=</span> <span class="number">1</span>; } } (<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, insert closer to tail, head section:</span> <span class="comment">//</span> <span class="comment">// I H T</span> <span class="comment">// [o o o A o o o o o o . . . o o o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o o I A o o o o o o . . o o o o]</span> <span class="comment">// M M M M M M</span> <span class="comment">// copy elements up to new tail</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">tail</span> <span class="op">-</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">tail</span>); <span class="comment">// copy last element into empty spot at bottom of buffer</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="number">1</span>, <span class="number">0</span>, <span class="number">1</span>); <span class="comment">// move elements from idx-1 to end forward not including ^ element</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">0</span>, <span class="number">1</span>, <span class="ident">idx</span> <span class="op">-</span> <span class="number">1</span>); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">-=</span> <span class="number">1</span>; } } (<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, insert closer to head, head section:</span> <span class="comment">//</span> <span class="comment">// I H T</span> <span class="comment">// [o o o o A o o . . . . . . o o o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o o o o I A o o . . . . . o o o]</span> <span class="comment">// M M M</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">idx</span>, <span class="self">self</span>.<span class="ident">head</span> <span class="op">-</span> <span class="ident">idx</span>); <span class="self">self</span>.<span class="ident">head</span> <span class="op">+=</span> <span class="number">1</span>; } } } <span class="comment">// tail might've been changed so we need to recalculate</span> <span class="kw">let</span> <span class="ident">new_idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">index</span>); <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">buffer_write</span>(<span class="ident">new_idx</span>, <span class="ident">value</span>); } } <span class="doccomment">/// Removes and returns the element at `index` from the `VecDeque`.</span> <span class="doccomment">/// Whichever end is closer to the removal point will be moved to make</span> <span class="doccomment">/// room, and all the affected elements will be moved to new positions.</span> <span class="doccomment">/// Returns `None` if `index` is out of bounds.</span> <span class="doccomment">///</span> <span class="doccomment">/// Element at index 0 is the front of the queue.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(1);</span> <span class="doccomment">/// buf.push_back(2);</span> <span class="doccomment">/// buf.push_back(3);</span> <span class="doccomment">/// assert_eq!(buf, [1, 2, 3]);</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(buf.remove(1), Some(2));</span> <span class="doccomment">/// assert_eq!(buf, [1, 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">remove</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_empty</span>() <span class="op">||</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op"><=</span> <span class="ident">index</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="comment">// There are three main cases:</span> <span class="comment">// Elements are contiguous</span> <span class="comment">// Elements are discontiguous and the removal is in the tail section</span> <span class="comment">// Elements are discontiguous and the removal is in the head section</span> <span class="comment">// - special case when elements are technically contiguous,</span> <span class="comment">// but self.head = 0</span> <span class="comment">//</span> <span class="comment">// For each of those there are two more cases:</span> <span class="comment">// Insert is closer to tail</span> <span class="comment">// Insert is closer to head</span> <span class="comment">//</span> <span class="comment">// Key: H - self.head</span> <span class="comment">// T - self.tail</span> <span class="comment">// o - Valid element</span> <span class="comment">// x - Element marked for removal</span> <span class="comment">// R - Indicates element that is being removed</span> <span class="comment">// M - Indicates element was moved</span> <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">index</span>); <span class="kw">let</span> <span class="ident">elem</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">buffer_read</span>(<span class="ident">idx</span>)) }; <span class="kw">let</span> <span class="ident">distance_to_tail</span> <span class="op">=</span> <span class="ident">index</span>; <span class="kw">let</span> <span class="ident">distance_to_head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">index</span>; <span class="kw">let</span> <span class="ident">contiguous</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">is_contiguous</span>(); <span class="kw">match</span> (<span class="ident">contiguous</span>, <span class="ident">distance_to_tail</span> <span class="op"><=</span> <span class="ident">distance_to_head</span>, <span class="ident">idx</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">tail</span>) { (<span class="bool-val">true</span>, <span class="bool-val">true</span>, _) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// contiguous, remove closer to tail:</span> <span class="comment">//</span> <span class="comment">// T R H</span> <span class="comment">// [. . . o o x o o o o . . . . . .]</span> <span class="comment">//</span> <span class="comment">// T H</span> <span class="comment">// [. . . . o o o o o o . . . . . .]</span> <span class="comment">// M M</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">tail</span> <span class="op">+</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">index</span>); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">+=</span> <span class="number">1</span>; } } (<span class="bool-val">true</span>, <span class="bool-val">false</span>, _) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// contiguous, remove closer to head:</span> <span class="comment">//</span> <span class="comment">// T R H</span> <span class="comment">// [. . . o o o o x o o . . . . . .]</span> <span class="comment">//</span> <span class="comment">// T H</span> <span class="comment">// [. . . o o o o o o . . . . . . .]</span> <span class="comment">// M M</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">idx</span>, <span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">head</span> <span class="op">-</span> <span class="ident">idx</span> <span class="op">-</span> <span class="number">1</span>); <span class="self">self</span>.<span class="ident">head</span> <span class="op">-=</span> <span class="number">1</span>; } } (<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, remove closer to tail, tail section:</span> <span class="comment">//</span> <span class="comment">// H T R</span> <span class="comment">// [o o o o o o . . . . . o o x o o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o o o o o o . . . . . . o o o o]</span> <span class="comment">// M M</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">tail</span> <span class="op">+</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">index</span>); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="number">1</span>); } } (<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">false</span>) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, remove closer to head, head section:</span> <span class="comment">//</span> <span class="comment">// R H T</span> <span class="comment">// [o o o o x o o . . . . . . o o o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o o o o o o . . . . . . . o o o]</span> <span class="comment">// M M</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">idx</span>, <span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">head</span> <span class="op">-</span> <span class="ident">idx</span> <span class="op">-</span> <span class="number">1</span>); <span class="self">self</span>.<span class="ident">head</span> <span class="op">-=</span> <span class="number">1</span>; } } (<span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, remove closer to head, tail section:</span> <span class="comment">//</span> <span class="comment">// H T R</span> <span class="comment">// [o o o . . . . . . o o o o o x o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o o . . . . . . . o o o o o o o]</span> <span class="comment">// M M M M</span> <span class="comment">//</span> <span class="comment">// or quasi-discontiguous, remove next to head, tail section:</span> <span class="comment">//</span> <span class="comment">// H T R</span> <span class="comment">// [. . . . . . . . . o o o o o x o]</span> <span class="comment">//</span> <span class="comment">// T H</span> <span class="comment">// [. . . . . . . . . o o o o o o .]</span> <span class="comment">// M</span> <span class="comment">// draw in elements in the tail section</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="ident">idx</span>, <span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="ident">idx</span> <span class="op">-</span> <span class="number">1</span>); <span class="comment">// Prevents underflow.</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">head</span> <span class="op">!=</span> <span class="number">0</span> { <span class="comment">// copy first element into empty spot</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="number">1</span>, <span class="number">0</span>, <span class="number">1</span>); <span class="comment">// move elements in the head section backwards</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">0</span>, <span class="number">1</span>, <span class="self">self</span>.<span class="ident">head</span> <span class="op">-</span> <span class="number">1</span>); } <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">head</span>, <span class="number">1</span>); } } (<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="op">=></span> { <span class="kw">unsafe</span> { <span class="comment">// discontiguous, remove closer to tail, head section:</span> <span class="comment">//</span> <span class="comment">// R H T</span> <span class="comment">// [o o x o o o o o o o . . . o o o]</span> <span class="comment">//</span> <span class="comment">// H T</span> <span class="comment">// [o o o o o o o o o o . . . . o o]</span> <span class="comment">// M M M M M</span> <span class="comment">// draw in elements up to idx</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">1</span>, <span class="number">0</span>, <span class="ident">idx</span>); <span class="comment">// copy last element into empty spot</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="number">0</span>, <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="number">1</span>, <span class="number">1</span>); <span class="comment">// move elements from tail to end forward, excluding the last one</span> <span class="self">self</span>.<span class="ident">copy</span>(<span class="self">self</span>.<span class="ident">tail</span> <span class="op">+</span> <span class="number">1</span>, <span class="self">self</span>.<span class="ident">tail</span>, <span class="self">self</span>.<span class="ident">cap</span>() <span class="op">-</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">-</span> <span class="number">1</span>); <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_add</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="number">1</span>); } } } <span class="kw">return</span> <span class="ident">elem</span>; } <span class="doccomment">/// Splits the collection into two at the given index.</span> <span class="doccomment">///</span> <span class="doccomment">/// Returns a newly allocated `Self`. `self` contains elements `[0, at)`,</span> <span class="doccomment">/// and the returned `Self` contains elements `[at, len)`.</span> <span class="doccomment">///</span> <span class="doccomment">/// Note that the capacity of `self` does not change.</span> <span class="doccomment">///</span> <span class="doccomment">/// Element at index 0 is the front of the queue.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if `at > len`</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf: VecDeque<_> = vec![1,2,3].into_iter().collect();</span> <span class="doccomment">/// let buf2 = buf.split_off(1);</span> <span class="doccomment">/// assert_eq!(buf, [1]);</span> <span class="doccomment">/// assert_eq!(buf2, [2, 3]);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"split_off"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">split_off</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">at</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">at</span> <span class="op"><=</span> <span class="ident">len</span>, <span class="string">"`at` out of bounds"</span>); <span class="kw">let</span> <span class="ident">other_len</span> <span class="op">=</span> <span class="ident">len</span> <span class="op">-</span> <span class="ident">at</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">other</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="ident">other_len</span>); <span class="kw">unsafe</span> { <span class="kw">let</span> (<span class="ident">first_half</span>, <span class="ident">second_half</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_slices</span>(); <span class="kw">let</span> <span class="ident">first_len</span> <span class="op">=</span> <span class="ident">first_half</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">second_len</span> <span class="op">=</span> <span class="ident">second_half</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">at</span> <span class="op"><</span> <span class="ident">first_len</span> { <span class="comment">// `at` lies in the first half.</span> <span class="kw">let</span> <span class="ident">amount_in_first</span> <span class="op">=</span> <span class="ident">first_len</span> <span class="op">-</span> <span class="ident">at</span>; <span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">first_half</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">at</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">other</span>.<span class="ident">ptr</span>(), <span class="ident">amount_in_first</span>); <span class="comment">// just take all of the second half.</span> <span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">second_half</span>.<span class="ident">as_ptr</span>(), <span class="ident">other</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">amount_in_first</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">second_len</span>); } <span class="kw">else</span> { <span class="comment">// `at` lies in the second half, need to factor in the elements we skipped</span> <span class="comment">// in the first half.</span> <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="ident">at</span> <span class="op">-</span> <span class="ident">first_len</span>; <span class="kw">let</span> <span class="ident">amount_in_second</span> <span class="op">=</span> <span class="ident">second_len</span> <span class="op">-</span> <span class="ident">offset</span>; <span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">second_half</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">offset</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">other</span>.<span class="ident">ptr</span>(), <span class="ident">amount_in_second</span>); } } <span class="comment">// Cleanup where the ends of the buffers are</span> <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">head</span>, <span class="ident">other_len</span>); <span class="ident">other</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">wrap_index</span>(<span class="ident">other_len</span>); <span class="ident">other</span> } <span class="doccomment">/// Moves all the elements of `other` into `Self`, leaving `other` empty.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Panics</span> <span class="doccomment">///</span> <span class="doccomment">/// Panics if the new number of elements in self overflows a `usize`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf: VecDeque<_> = vec![1, 2].into_iter().collect();</span> <span class="doccomment">/// let mut buf2: VecDeque<_> = vec![3, 4].into_iter().collect();</span> <span class="doccomment">/// buf.append(&mut buf2);</span> <span class="doccomment">/// assert_eq!(buf, [1, 2, 3, 4]);</span> <span class="doccomment">/// assert_eq!(buf2, []);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"append"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">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">// naive impl</span> <span class="self">self</span>.<span class="ident">extend</span>(<span class="ident">other</span>.<span class="ident">drain</span>(..)); } <span class="doccomment">/// Retains only the elements specified by the predicate.</span> <span class="doccomment">///</span> <span class="doccomment">/// In other words, remove all elements `e` such that `f(&e)` returns false.</span> <span class="doccomment">/// This method operates in place and preserves the order of the retained</span> <span class="doccomment">/// elements.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.extend(1..5);</span> <span class="doccomment">/// buf.retain(|&x| x%2 == 0);</span> <span class="doccomment">/// assert_eq!(buf, [2, 4]);</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">"vec_deque_retain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">retain</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">del</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="kw">if</span> <span class="op">!</span><span class="ident">f</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">i</span>]) { <span class="ident">del</span> <span class="op">+=</span> <span class="number">1</span>; } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">del</span> <span class="op">></span> <span class="number">0</span> { <span class="self">self</span>.<span class="ident">swap</span>(<span class="ident">i</span> <span class="op">-</span> <span class="ident">del</span>, <span class="ident">i</span>); } } <span class="kw">if</span> <span class="ident">del</span> <span class="op">></span> <span class="number">0</span> { <span class="self">self</span>.<span class="ident">truncate</span>(<span class="ident">len</span> <span class="op">-</span> <span class="ident">del</span>); } } <span class="comment">// This may panic or abort</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">grow_if_necessary</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_full</span>() { <span class="kw">let</span> <span class="ident">old_cap</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cap</span>(); <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">double</span>(); <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">handle_cap_increase</span>(<span class="ident">old_cap</span>); } <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">is_full</span>()); } } <span class="doccomment">/// Returns a place for insertion at the back of the `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// Using this method with placement syntax is equivalent to [`push_back`](#method.push_back),</span> <span class="doccomment">/// but may be more efficient.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// #![feature(collection_placement)]</span> <span class="doccomment">/// #![feature(placement_in_syntax)]</span> <span class="doccomment">///</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.place_back() <- 3;</span> <span class="doccomment">/// buf.place_back() <- 4;</span> <span class="doccomment">/// assert_eq!(&buf, &[3, 4]);</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">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">place_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">PlaceBack</span> { <span class="ident">vec_deque</span>: <span class="self">self</span> } } <span class="doccomment">/// Returns a place for insertion at the front of the `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// Using this method with placement syntax is equivalent to [`push_front`](#method.push_front),</span> <span class="doccomment">/// but may be more efficient.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// #![feature(collection_placement)]</span> <span class="doccomment">/// #![feature(placement_in_syntax)]</span> <span class="doccomment">///</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.place_front() <- 3;</span> <span class="doccomment">/// buf.place_front() <- 4;</span> <span class="doccomment">/// assert_eq!(&buf, &[4, 3]);</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">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">place_front</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">PlaceFront</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">PlaceFront</span> { <span class="ident">vec_deque</span>: <span class="self">self</span> } } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="doccomment">/// Modifies the `VecDeque` in-place so that `len()` is equal to new_len,</span> <span class="doccomment">/// either by removing excess elements or by appending clones of `value` to the back.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::collections::VecDeque;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = VecDeque::new();</span> <span class="doccomment">/// buf.push_back(5);</span> <span class="doccomment">/// buf.push_back(10);</span> <span class="doccomment">/// buf.push_back(15);</span> <span class="doccomment">/// assert_eq!(buf, [5, 10, 15]);</span> <span class="doccomment">///</span> <span class="doccomment">/// buf.resize(2, 0);</span> <span class="doccomment">/// assert_eq!(buf, [5, 10]);</span> <span class="doccomment">///</span> <span class="doccomment">/// buf.resize(5, 20);</span> <span class="doccomment">/// assert_eq!(buf, [5, 10, 20, 20, 20]);</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">"deque_extras"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">resize</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">new_len</span>: <span class="ident">usize</span>, <span class="ident">value</span>: <span class="ident">T</span>) { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>(); <span class="kw">if</span> <span class="ident">new_len</span> <span class="op">></span> <span class="ident">len</span> { <span class="self">self</span>.<span class="ident">extend</span>(<span class="ident">repeat</span>(<span class="ident">value</span>).<span class="ident">take</span>(<span class="ident">new_len</span> <span class="op">-</span> <span class="ident">len</span>)) } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">truncate</span>(<span class="ident">new_len</span>); } } } <span class="doccomment">/// Returns the index in the underlying buffer for a given logical element index.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">wrap_index</span>(<span class="ident">index</span>: <span class="ident">usize</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="comment">// size is always a power of 2</span> <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">size</span>.<span class="ident">is_power_of_two</span>()); <span class="ident">index</span> <span class="op">&</span> (<span class="ident">size</span> <span class="op">-</span> <span class="number">1</span>) } <span class="doccomment">/// Returns the two slices that cover the `VecDeque`'s valid range</span> <span class="kw">trait</span> <span class="ident">RingSlices</span>: <span class="ident">Sized</span> { <span class="kw">fn</span> <span class="ident">slice</span>(<span class="self">self</span>, <span class="ident">from</span>: <span class="ident">usize</span>, <span class="ident">to</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span>; <span class="kw">fn</span> <span class="ident">split_at</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="self">Self</span>, <span class="self">Self</span>); <span class="kw">fn</span> <span class="ident">ring_slices</span>(<span class="ident">buf</span>: <span class="self">Self</span>, <span class="ident">head</span>: <span class="ident">usize</span>, <span class="ident">tail</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="self">Self</span>, <span class="self">Self</span>) { <span class="kw">let</span> <span class="ident">contiguous</span> <span class="op">=</span> <span class="ident">tail</span> <span class="op"><=</span> <span class="ident">head</span>; <span class="kw">if</span> <span class="ident">contiguous</span> { <span class="kw">let</span> (<span class="ident">empty</span>, <span class="ident">buf</span>) <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">split_at</span>(<span class="number">0</span>); (<span class="ident">buf</span>.<span class="ident">slice</span>(<span class="ident">tail</span>, <span class="ident">head</span>), <span class="ident">empty</span>) } <span class="kw">else</span> { <span class="kw">let</span> (<span class="ident">mid</span>, <span class="ident">right</span>) <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">split_at</span>(<span class="ident">tail</span>); <span class="kw">let</span> (<span class="ident">left</span>, _) <span class="op">=</span> <span class="ident">mid</span>.<span class="ident">split_at</span>(<span class="ident">head</span>); (<span class="ident">right</span>, <span class="ident">left</span>) } } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">RingSlices</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>] { <span class="kw">fn</span> <span class="ident">slice</span>(<span class="self">self</span>, <span class="ident">from</span>: <span class="ident">usize</span>, <span class="ident">to</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw-2">&</span><span class="self">self</span>[<span class="ident">from</span>..<span class="ident">to</span>] } <span class="kw">fn</span> <span class="ident">split_at</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="self">Self</span>, <span class="self">Self</span>) { (<span class="kw-2">*</span><span class="self">self</span>).<span class="ident">split_at</span>(<span class="ident">i</span>) } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">RingSlices</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>] { <span class="kw">fn</span> <span class="ident">slice</span>(<span class="self">self</span>, <span class="ident">from</span>: <span class="ident">usize</span>, <span class="ident">to</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[<span class="ident">from</span>..<span class="ident">to</span>] } <span class="kw">fn</span> <span class="ident">split_at</span>(<span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="self">Self</span>, <span class="self">Self</span>) { (<span class="kw-2">*</span><span class="self">self</span>).<span class="ident">split_at_mut</span>(<span class="ident">i</span>) } } <span class="doccomment">/// Calculate the number of elements left to be read in the buffer</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">count</span>(<span class="ident">tail</span>: <span class="ident">usize</span>, <span class="ident">head</span>: <span class="ident">usize</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="comment">// size is always a power of 2</span> (<span class="ident">head</span>.<span class="ident">wrapping_sub</span>(<span class="ident">tail</span>)) <span class="op">&</span> (<span class="ident">size</span> <span class="op">-</span> <span class="number">1</span>) } <span class="doccomment">/// An iterator over the elements of a `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`iter`] method on [`VecDeque`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`iter`]: struct.VecDeque.html#method.iter</span> <span class="doccomment">/// [`VecDeque`]: struct.VecDeque.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">ring</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>], <span class="ident">tail</span>: <span class="ident">usize</span>, <span class="ident">head</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">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Iter"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">ring</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">tail</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">head</span>) .<span class="ident">finish</span>() } } <span class="comment">// FIXME(#19839) Remove in favor of `#[derive(Clone)]`</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">Iter</span> { <span class="ident">ring</span>: <span class="self">self</span>.<span class="ident">ring</span>, <span class="ident">tail</span>: <span class="self">self</span>.<span class="ident">tail</span>, <span class="ident">head</span>: <span class="self">self</span>.<span class="ident">head</span>, } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">head</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail</span>; <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">wrap_index</span>(<span class="self">self</span>.<span class="ident">tail</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>), <span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">len</span>()); <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">get_unchecked</span>(<span class="ident">tail</span>)) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">count</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="self">self</span>.<span class="ident">head</span>, <span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">len</span>()); (<span class="ident">len</span>, <span class="prelude-val">Some</span>(<span class="ident">len</span>)) } <span class="kw">fn</span> <span class="ident">fold</span><span class="op"><</span><span class="ident">Acc</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">accum</span>: <span class="ident">Acc</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Acc</span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">Acc</span>, <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">Acc</span> { <span class="kw">let</span> (<span class="ident">front</span>, <span class="ident">back</span>) <span class="op">=</span> <span class="ident">RingSlices</span>::<span class="ident">ring_slices</span>(<span class="self">self</span>.<span class="ident">ring</span>, <span class="self">self</span>.<span class="ident">head</span>, <span class="self">self</span>.<span class="ident">tail</span>); <span class="ident">accum</span> <span class="op">=</span> <span class="ident">front</span>.<span class="ident">iter</span>().<span class="ident">fold</span>(<span class="ident">accum</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>); <span class="ident">back</span>.<span class="ident">iter</span>().<span class="ident">fold</span>(<span class="ident">accum</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">head</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">wrap_index</span>(<span class="self">self</span>.<span class="ident">head</span>.<span class="ident">wrapping_sub</span>(<span class="number">1</span>), <span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">len</span>()); <span class="kw">unsafe</span> { <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">get_unchecked</span>(<span class="self">self</span>.<span class="ident">head</span>)) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">head</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">tail</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="doccomment">/// A mutable iterator over the elements of a `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`iter_mut`] method on [`VecDeque`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`iter_mut`]: struct.VecDeque.html#method.iter_mut</span> <span class="doccomment">/// [`VecDeque`]: struct.VecDeque.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">ring</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>], <span class="ident">tail</span>: <span class="ident">usize</span>, <span class="ident">head</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">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"IterMut"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">ring</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">tail</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">head</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">T</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">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">head</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail</span>; <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">wrap_index</span>(<span class="self">self</span>.<span class="ident">tail</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>), <span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">len</span>()); <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">elem</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">tail</span>); <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="ident">elem</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _)) } } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">count</span>(<span class="self">self</span>.<span class="ident">tail</span>, <span class="self">self</span>.<span class="ident">head</span>, <span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">len</span>()); (<span class="ident">len</span>, <span class="prelude-val">Some</span>(<span class="ident">len</span>)) } <span class="kw">fn</span> <span class="ident">fold</span><span class="op"><</span><span class="ident">Acc</span>, <span class="ident">F</span><span class="op">></span>(<span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">accum</span>: <span class="ident">Acc</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Acc</span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">Acc</span>, <span class="self">Self</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">Acc</span> { <span class="kw">let</span> (<span class="ident">front</span>, <span class="ident">back</span>) <span class="op">=</span> <span class="ident">RingSlices</span>::<span class="ident">ring_slices</span>(<span class="self">self</span>.<span class="ident">ring</span>, <span class="self">self</span>.<span class="ident">head</span>, <span class="self">self</span>.<span class="ident">tail</span>); <span class="ident">accum</span> <span class="op">=</span> <span class="ident">front</span>.<span class="ident">iter_mut</span>().<span class="ident">fold</span>(<span class="ident">accum</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>); <span class="ident">back</span>.<span class="ident">iter_mut</span>().<span class="ident">fold</span>(<span class="ident">accum</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">head</span> { <span class="kw">return</span> <span class="prelude-val">None</span>; } <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">wrap_index</span>(<span class="self">self</span>.<span class="ident">head</span>.<span class="ident">wrapping_sub</span>(<span class="number">1</span>), <span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">len</span>()); <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">elem</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">ring</span>.<span class="ident">get_unchecked_mut</span>(<span class="self">self</span>.<span class="ident">head</span>); <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="ident">elem</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _)) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">head</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">tail</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="doccomment">/// An owning iterator over the elements of a `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`into_iter`] method on [`VecDeque`][`VecDeque`]</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.VecDeque.html#method.into_iter</span> <span class="doccomment">/// [`VecDeque`]: struct.VecDeque.html</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="ident">inner</span>: <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"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">T</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">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"IntoIter"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</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="ident">T</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">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">pop_front</span>() } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">len</span>(); (<span class="ident">len</span>, <span class="prelude-val">Some</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">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">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">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">pop_back</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">is_empty</span>() } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</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">T</span><span class="op">></span> {} <span class="doccomment">/// A draining iterator over the elements of a `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// This `struct` is created by the [`drain`] method on [`VecDeque`]. See its</span> <span class="doccomment">/// documentation for more.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`drain`]: struct.VecDeque.html#method.drain</span> <span class="doccomment">/// [`VecDeque`]: struct.VecDeque.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">after_tail</span>: <span class="ident">usize</span>, <span class="ident">after_head</span>: <span class="ident">usize</span>, <span class="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">deque</span>: <span class="ident">Shared</span><span class="op"><</span><span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"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">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Drain"</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">after_tail</span>) .<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">after_head</span>) .<span class="ident">field</span>(<span class="kw-2">&</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">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="kw">for</span> _ <span class="kw">in</span> <span class="self">self</span>.<span class="ident">by_ref</span>() {} <span class="kw">let</span> <span class="ident">source_deque</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">deque</span>.<span class="ident">as_mut</span>() }; <span class="comment">// T = source_deque_tail; H = source_deque_head; t = drain_tail; h = drain_head</span> <span class="comment">//</span> <span class="comment">// T t h H</span> <span class="comment">// [. . . o o x x o o . . .]</span> <span class="comment">//</span> <span class="kw">let</span> <span class="ident">orig_tail</span> <span class="op">=</span> <span class="ident">source_deque</span>.<span class="ident">tail</span>; <span class="kw">let</span> <span class="ident">drain_tail</span> <span class="op">=</span> <span class="ident">source_deque</span>.<span class="ident">head</span>; <span class="kw">let</span> <span class="ident">drain_head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">after_tail</span>; <span class="kw">let</span> <span class="ident">orig_head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">after_head</span>; <span class="kw">let</span> <span class="ident">tail_len</span> <span class="op">=</span> <span class="ident">count</span>(<span class="ident">orig_tail</span>, <span class="ident">drain_tail</span>, <span class="ident">source_deque</span>.<span class="ident">cap</span>()); <span class="kw">let</span> <span class="ident">head_len</span> <span class="op">=</span> <span class="ident">count</span>(<span class="ident">drain_head</span>, <span class="ident">orig_head</span>, <span class="ident">source_deque</span>.<span class="ident">cap</span>()); <span class="comment">// Restore the original head value</span> <span class="ident">source_deque</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">orig_head</span>; <span class="kw">match</span> (<span class="ident">tail_len</span>, <span class="ident">head_len</span>) { (<span class="number">0</span>, <span class="number">0</span>) <span class="op">=></span> { <span class="ident">source_deque</span>.<span class="ident">head</span> <span class="op">=</span> <span class="number">0</span>; <span class="ident">source_deque</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="number">0</span>; } (<span class="number">0</span>, _) <span class="op">=></span> { <span class="ident">source_deque</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">drain_head</span>; } (_, <span class="number">0</span>) <span class="op">=></span> { <span class="ident">source_deque</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">drain_tail</span>; } _ <span class="op">=></span> <span class="kw">unsafe</span> { <span class="kw">if</span> <span class="ident">tail_len</span> <span class="op"><=</span> <span class="ident">head_len</span> { <span class="ident">source_deque</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">source_deque</span>.<span class="ident">wrap_sub</span>(<span class="ident">drain_head</span>, <span class="ident">tail_len</span>); <span class="ident">source_deque</span>.<span class="ident">wrap_copy</span>(<span class="ident">source_deque</span>.<span class="ident">tail</span>, <span class="ident">orig_tail</span>, <span class="ident">tail_len</span>); } <span class="kw">else</span> { <span class="ident">source_deque</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">source_deque</span>.<span class="ident">wrap_add</span>(<span class="ident">drain_tail</span>, <span class="ident">head_len</span>); <span class="ident">source_deque</span>.<span class="ident">wrap_copy</span>(<span class="ident">drain_tail</span>, <span class="ident">drain_head</span>, <span class="ident">head_len</span>); } }, } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">elt</span>) }) } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) { <span class="self">self</span>.<span class="ident">iter</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">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">elt</span>) }) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {} <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>: <span class="ident">PartialEq</span><span class="op">></span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</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">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="ident">other</span>.<span class="ident">len</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; } <span class="kw">let</span> (<span class="ident">sa</span>, <span class="ident">sb</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_slices</span>(); <span class="kw">let</span> (<span class="ident">oa</span>, <span class="ident">ob</span>) <span class="op">=</span> <span class="ident">other</span>.<span class="ident">as_slices</span>(); <span class="kw">if</span> <span class="ident">sa</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="ident">oa</span>.<span class="ident">len</span>() { <span class="ident">sa</span> <span class="op">==</span> <span class="ident">oa</span> <span class="op">&&</span> <span class="ident">sb</span> <span class="op">==</span> <span class="ident">ob</span> } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">sa</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">oa</span>.<span class="ident">len</span>() { <span class="comment">// Always divisible in three sections, for example:</span> <span class="comment">// self: [a b c|d e f]</span> <span class="comment">// other: [0 1 2 3|4 5]</span> <span class="comment">// front = 3, mid = 1,</span> <span class="comment">// [a b c] == [0 1 2] && [d] == [3] && [e f] == [4 5]</span> <span class="kw">let</span> <span class="ident">front</span> <span class="op">=</span> <span class="ident">sa</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">mid</span> <span class="op">=</span> <span class="ident">oa</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">front</span>; <span class="kw">let</span> (<span class="ident">oa_front</span>, <span class="ident">oa_mid</span>) <span class="op">=</span> <span class="ident">oa</span>.<span class="ident">split_at</span>(<span class="ident">front</span>); <span class="kw">let</span> (<span class="ident">sb_mid</span>, <span class="ident">sb_back</span>) <span class="op">=</span> <span class="ident">sb</span>.<span class="ident">split_at</span>(<span class="ident">mid</span>); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">sa</span>.<span class="ident">len</span>(), <span class="ident">oa_front</span>.<span class="ident">len</span>()); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">sb_mid</span>.<span class="ident">len</span>(), <span class="ident">oa_mid</span>.<span class="ident">len</span>()); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">sb_back</span>.<span class="ident">len</span>(), <span class="ident">ob</span>.<span class="ident">len</span>()); <span class="ident">sa</span> <span class="op">==</span> <span class="ident">oa_front</span> <span class="op">&&</span> <span class="ident">sb_mid</span> <span class="op">==</span> <span class="ident">oa_mid</span> <span class="op">&&</span> <span class="ident">sb_back</span> <span class="op">==</span> <span class="ident">ob</span> } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">front</span> <span class="op">=</span> <span class="ident">oa</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">mid</span> <span class="op">=</span> <span class="ident">sa</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="ident">front</span>; <span class="kw">let</span> (<span class="ident">sa_front</span>, <span class="ident">sa_mid</span>) <span class="op">=</span> <span class="ident">sa</span>.<span class="ident">split_at</span>(<span class="ident">front</span>); <span class="kw">let</span> (<span class="ident">ob_mid</span>, <span class="ident">ob_back</span>) <span class="op">=</span> <span class="ident">ob</span>.<span class="ident">split_at</span>(<span class="ident">mid</span>); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">sa_front</span>.<span class="ident">len</span>(), <span class="ident">oa</span>.<span class="ident">len</span>()); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">sa_mid</span>.<span class="ident">len</span>(), <span class="ident">ob_mid</span>.<span class="ident">len</span>()); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">sb</span>.<span class="ident">len</span>(), <span class="ident">ob_back</span>.<span class="ident">len</span>()); <span class="ident">sa_front</span> <span class="op">==</span> <span class="ident">oa</span> <span class="op">&&</span> <span class="ident">sa_mid</span> <span class="op">==</span> <span class="ident">ob_mid</span> <span class="op">&&</span> <span class="ident">sb</span> <span class="op">==</span> <span class="ident">ob_back</span> } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>: <span class="ident">Eq</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> {} <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">__impl_slice_eq1</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>: <span class="ident">ty</span>) <span class="op">=></span> { <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>, <span class="ident">Sized</span> } }; (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>: <span class="ident">ident</span>) <span class="op">=></span> { <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vec-deque-partial-eq-slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">A</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">PartialEq</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span> <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="ident">other</span>.<span class="ident">len</span>() { <span class="kw">return</span> <span class="bool-val">false</span>; } <span class="kw">let</span> (<span class="ident">sa</span>, <span class="ident">sb</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_slices</span>(); <span class="kw">let</span> (<span class="ident">oa</span>, <span class="ident">ob</span>) <span class="op">=</span> <span class="ident">other</span>[..].<span class="ident">split_at</span>(<span class="ident">sa</span>.<span class="ident">len</span>()); <span class="ident">sa</span> <span class="op">==</span> <span class="ident">oa</span> <span class="op">&&</span> <span class="ident">sb</span> <span class="op">==</span> <span class="ident">ob</span> } } } } <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> } <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">B</span>] } <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> [<span class="ident">B</span>] } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">array_impls</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>: <span class="ident">expr</span>)<span class="op">+</span>) <span class="op">=></span> { $( <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, [<span class="ident">B</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] } <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">B</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] } <span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> [<span class="ident">B</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] } )<span class="op">+</span> } } <span class="macro">array_impls</span><span class="macro">!</span> { <span class="number">0</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">21</span> <span class="number">22</span> <span class="number">23</span> <span class="number">24</span> <span class="number">25</span> <span class="number">26</span> <span class="number">27</span> <span class="number">28</span> <span class="number">29</span> <span class="number">30</span> <span class="number">31</span> <span class="number">32</span> } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>: <span class="ident">PartialOrd</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></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">VecDeque</span><span class="op"><</span><span class="ident">A</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">A</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</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">VecDeque</span><span class="op"><</span><span class="ident">A</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">A</span>: <span class="ident">Hash</span><span class="op">></span> <span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</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="self">self</span>.<span class="ident">len</span>().<span class="ident">hash</span>(<span class="ident">state</span>); <span class="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_slices</span>(); <span class="ident">Hash</span>::<span class="ident">hash_slice</span>(<span class="ident">a</span>, <span class="ident">state</span>); <span class="ident">Hash</span>::<span class="ident">hash_slice</span>(<span class="ident">b</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">A</span><span class="op">></span> <span class="ident">Index</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">A</span>; <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">A</span> { <span class="self">self</span>.<span class="ident">get</span>(<span class="ident">index</span>).<span class="ident">expect</span>(<span class="string">"Out of bounds access"</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">IndexMut</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">A</span> { <span class="self">self</span>.<span class="ident">get_mut</span>(<span class="ident">index</span>).<span class="ident">expect</span>(<span class="string">"Out of bounds access"</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">FromIterator</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</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">A</span><span class="op">>></span>(<span class="ident">iter</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">iterator</span> <span class="op">=</span> <span class="ident">iter</span>.<span class="ident">into_iter</span>(); <span class="kw">let</span> (<span class="ident">lower</span>, _) <span class="op">=</span> <span class="ident">iterator</span>.<span class="ident">size_hint</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deq</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="ident">lower</span>); <span class="ident">deq</span>.<span class="ident">extend</span>(<span class="ident">iterator</span>); <span class="ident">deq</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</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">T</span><span class="op">></span>; <span class="doccomment">/// Consumes the list into a front-to-back iterator yielding elements by</span> <span class="doccomment">/// value.</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">T</span><span class="op">></span> { <span class="ident">IntoIter</span> { <span class="ident">inner</span>: <span class="self">self</span> } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>; <span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter_mut</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">Extend</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">A</span><span class="op">></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">A</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">elt</span> <span class="kw">in</span> <span class="ident">iter</span> { <span class="self">self</span>.<span class="ident">push_back</span>(<span class="ident">elt</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">T</span>: <span class="lifetime">'a</span> <span class="op">+</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">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</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">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">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">cloned</span>()); } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">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">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="self">self</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">"vecdeque_vec_conversions"</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="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">from</span>(<span class="kw-2">mut</span> <span class="ident">other</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">other_buf</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">as_mut_ptr</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">RawVec</span>::<span class="ident">from_raw_parts</span>(<span class="ident">other_buf</span>, <span class="ident">other</span>.<span class="ident">capacity</span>()); <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">len</span>(); <span class="ident">mem</span>::<span class="ident">forget</span>(<span class="ident">other</span>); <span class="comment">// We need to extend the buf if it's not a power of two, too small</span> <span class="comment">// or doesn't have at least one free space</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">buf</span>.<span class="ident">cap</span>().<span class="ident">is_power_of_two</span>() <span class="op">||</span> (<span class="ident">buf</span>.<span class="ident">cap</span>() <span class="op"><</span> (<span class="ident">MINIMUM_CAPACITY</span> <span class="op">+</span> <span class="number">1</span>)) <span class="op">||</span> (<span class="ident">buf</span>.<span class="ident">cap</span>() <span class="op">==</span> <span class="ident">len</span>) { <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">max</span>(<span class="ident">buf</span>.<span class="ident">cap</span>() <span class="op">+</span> <span class="number">1</span>, <span class="ident">MINIMUM_CAPACITY</span> <span class="op">+</span> <span class="number">1</span>).<span class="ident">next_power_of_two</span>(); <span class="ident">buf</span>.<span class="ident">reserve_exact</span>(<span class="ident">len</span>, <span class="ident">cap</span> <span class="op">-</span> <span class="ident">len</span>); } <span class="ident">VecDeque</span> { <span class="ident">tail</span>: <span class="number">0</span>, <span class="ident">head</span>: <span class="ident">len</span>, <span class="ident">buf</span>: <span class="ident">buf</span>, } } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vecdeque_vec_conversions"</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="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">other</span>: <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">buf</span>.<span class="ident">ptr</span>(); <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">tail</span>; <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">head</span>; <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">cap</span>(); <span class="comment">// Need to move the ring to the front of the buffer, as vec will expect this.</span> <span class="kw">if</span> <span class="ident">other</span>.<span class="ident">is_contiguous</span>() { <span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">buf</span>.<span class="ident">offset</span>(<span class="ident">tail</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">buf</span>, <span class="ident">len</span>); } <span class="kw">else</span> { <span class="kw">if</span> (<span class="ident">tail</span> <span class="op">-</span> <span class="ident">head</span>) <span class="op">>=</span> <span class="ident">cmp</span>::<span class="ident">min</span>((<span class="ident">cap</span> <span class="op">-</span> <span class="ident">tail</span>), <span class="ident">head</span>) { <span class="comment">// There is enough free space in the centre for the shortest block so we can</span> <span class="comment">// do this in at most three copy moves.</span> <span class="kw">if</span> (<span class="ident">cap</span> <span class="op">-</span> <span class="ident">tail</span>) <span class="op">></span> <span class="ident">head</span> { <span class="comment">// right hand block is the long one; move that enough for the left</span> <span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">buf</span>.<span class="ident">offset</span>(<span class="ident">tail</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">buf</span>.<span class="ident">offset</span>((<span class="ident">tail</span> <span class="op">-</span> <span class="ident">head</span>) <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">cap</span> <span class="op">-</span> <span class="ident">tail</span>); <span class="comment">// copy left in the end</span> <span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">buf</span>, <span class="ident">buf</span>.<span class="ident">offset</span>((<span class="ident">cap</span> <span class="op">-</span> <span class="ident">head</span>) <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">head</span>); <span class="comment">// shift the new thing to the start</span> <span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">buf</span>.<span class="ident">offset</span>((<span class="ident">tail</span> <span class="op">-</span> <span class="ident">head</span>) <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">buf</span>, <span class="ident">len</span>); } <span class="kw">else</span> { <span class="comment">// left hand block is the long one, we can do it in two!</span> <span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">buf</span>, <span class="ident">buf</span>.<span class="ident">offset</span>((<span class="ident">cap</span> <span class="op">-</span> <span class="ident">tail</span>) <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">head</span>); <span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">buf</span>.<span class="ident">offset</span>(<span class="ident">tail</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">buf</span>, <span class="ident">cap</span> <span class="op">-</span> <span class="ident">tail</span>); } } <span class="kw">else</span> { <span class="comment">// Need to use N swaps to move the ring</span> <span class="comment">// We can use the space at the end of the ring as a temp store</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">left_edge</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">right_edge</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="ident">tail</span>; <span class="comment">// The general problem looks like this</span> <span class="comment">// GHIJKLM...ABCDEF - before any swaps</span> <span class="comment">// ABCDEFM...GHIJKL - after 1 pass of swaps</span> <span class="comment">// ABCDEFGHIJM...KL - swap until the left edge reaches the temp store</span> <span class="comment">// - then restart the algorithm with a new (smaller) store</span> <span class="comment">// Sometimes the temp store is reached when the right edge is at the end</span> <span class="comment">// of the buffer - this means we've hit the right order with fewer swaps!</span> <span class="comment">// E.g</span> <span class="comment">// EF..ABCD</span> <span class="comment">// ABCDEF.. - after four only swaps we've finished</span> <span class="kw">while</span> <span class="ident">left_edge</span> <span class="op"><</span> <span class="ident">len</span> <span class="op">&&</span> <span class="ident">right_edge</span> <span class="op">!=</span> <span class="ident">cap</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">right_offset</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">left_edge</span>..<span class="ident">right_edge</span> { <span class="ident">right_offset</span> <span class="op">=</span> (<span class="ident">i</span> <span class="op">-</span> <span class="ident">left_edge</span>) <span class="op">%</span> (<span class="ident">cap</span> <span class="op">-</span> <span class="ident">right_edge</span>); <span class="kw">let</span> <span class="ident">src</span>: <span class="ident">isize</span> <span class="op">=</span> (<span class="ident">right_edge</span> <span class="op">+</span> <span class="ident">right_offset</span>) <span class="kw">as</span> <span class="ident">isize</span>; <span class="ident">ptr</span>::<span class="ident">swap</span>(<span class="ident">buf</span>.<span class="ident">offset</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">isize</span>), <span class="ident">buf</span>.<span class="ident">offset</span>(<span class="ident">src</span>)); } <span class="kw">let</span> <span class="ident">n_ops</span> <span class="op">=</span> <span class="ident">right_edge</span> <span class="op">-</span> <span class="ident">left_edge</span>; <span class="ident">left_edge</span> <span class="op">+=</span> <span class="ident">n_ops</span>; <span class="ident">right_edge</span> <span class="op">+=</span> <span class="ident">right_offset</span> <span class="op">+</span> <span class="number">1</span>; } } } <span class="kw">let</span> <span class="ident">out</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">from_raw_parts</span>(<span class="ident">buf</span>, <span class="ident">len</span>, <span class="ident">cap</span>); <span class="ident">mem</span>::<span class="ident">forget</span>(<span class="ident">other</span>); <span class="ident">out</span> } } } <span class="doccomment">/// A place for insertion at the back of a `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// See [`VecDeque::place_back`](struct.VecDeque.html#method.place_back) for details.</span> <span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"places do nothing unless written to with `<-` syntax"</span>]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"struct name and placement protocol are subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</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">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">vec_deque</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Placer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Place</span> <span class="op">=</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">make_place</span>(<span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">grow_if_necessary</span>(); <span class="self">self</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Place</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">pointer</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">head</span> <span class="kw">as</span> <span class="ident">isize</span>) } } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">InPlace</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Owner</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>; <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">finalize</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="kw-2">mut</span> <span class="ident">T</span> { <span class="kw">let</span> <span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">head</span>; <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">head</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">wrap_add</span>(<span class="ident">head</span>, <span class="number">1</span>); <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">head</span> <span class="kw">as</span> <span class="ident">isize</span>)) } } <span class="doccomment">/// A place for insertion at the front of a `VecDeque`.</span> <span class="doccomment">///</span> <span class="doccomment">/// See [`VecDeque::place_front`](struct.VecDeque.html#method.place_front) for details.</span> <span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"places do nothing unless written to with `<-` syntax"</span>]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"struct name and placement protocol are subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</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">PlaceFront</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">vec_deque</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Placer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceFront</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Place</span> <span class="op">=</span> <span class="ident">PlaceFront</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>; <span class="kw">fn</span> <span class="ident">make_place</span>(<span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">grow_if_necessary</span>(); <span class="self">self</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Place</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceFront</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">pointer</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">tail</span>, <span class="number">1</span>); <span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="ident">tail</span> <span class="kw">as</span> <span class="ident">isize</span>) } } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">InPlace</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceFront</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">type</span> <span class="ident">Owner</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>; <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">finalize</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="kw-2">mut</span> <span class="ident">T</span> { <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">wrap_sub</span>(<span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">tail</span>, <span class="number">1</span>); <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">vec_deque</span>.<span class="ident">tail</span> <span class="kw">as</span> <span class="ident">isize</span>)) } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> <span class="kw">mod</span> <span class="ident">tests</span> { <span class="kw">use</span> <span class="ident">test</span>; <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">VecDeque</span>; <span class="attribute">#[<span class="ident">bench</span>]</span> <span class="kw">fn</span> <span class="ident">bench_push_back_100</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">test</span>::<span class="ident">Bencher</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deq</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="number">101</span>); <span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">||</span> { <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">100</span> { <span class="ident">deq</span>.<span class="ident">push_back</span>(<span class="ident">i</span>); } <span class="ident">deq</span>.<span class="ident">head</span> <span class="op">=</span> <span class="number">0</span>; <span class="ident">deq</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="number">0</span>; }) } <span class="attribute">#[<span class="ident">bench</span>]</span> <span class="kw">fn</span> <span class="ident">bench_push_front_100</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">test</span>::<span class="ident">Bencher</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deq</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="number">101</span>); <span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">||</span> { <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">100</span> { <span class="ident">deq</span>.<span class="ident">push_front</span>(<span class="ident">i</span>); } <span class="ident">deq</span>.<span class="ident">head</span> <span class="op">=</span> <span class="number">0</span>; <span class="ident">deq</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="number">0</span>; }) } <span class="attribute">#[<span class="ident">bench</span>]</span> <span class="kw">fn</span> <span class="ident">bench_pop_back_100</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">test</span>::<span class="ident">Bencher</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deq</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">with_capacity</span>(<span class="number">101</span>); <span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">||</span> { <span class="ident">deq</span>.<span class="ident">head</span> <span class="op">=</span> <span class="number">100</span>; <span class="ident">deq</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">while</span> <span class="op">!</span><span class="ident">deq</span>.<span class="ident">is_empty</span>() { <span class="ident">test</span>::<span class="ident">black_box</span>(<span class="ident">deq</span>.<span class="ident">pop_back</span>()); } }) } <span class="attribute">#[<span class="ident">bench</span>]</span> <span class="kw">fn</span> <span class="ident">bench_pop_front_100</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">test</span>::<span class="ident">Bencher</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">deq</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">with_capacity</span>(<span class="number">101</span>); <span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">||</span> { <span class="ident">deq</span>.<span class="ident">head</span> <span class="op">=</span> <span class="number">100</span>; <span class="ident">deq</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">while</span> <span class="op">!</span><span class="ident">deq</span>.<span class="ident">is_empty</span>() { <span class="ident">test</span>::<span class="ident">black_box</span>(<span class="ident">deq</span>.<span class="ident">pop_front</span>()); } }) } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_swap_front_back_remove</span>() { <span class="kw">fn</span> <span class="ident">test</span>(<span class="ident">back</span>: <span class="ident">bool</span>) { <span class="comment">// This test checks that every single combination of tail position and length is tested.</span> <span class="comment">// Capacity 15 should be large enough to cover every case.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tester</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="number">15</span>); <span class="kw">let</span> <span class="ident">usable_cap</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">capacity</span>(); <span class="kw">let</span> <span class="ident">final_len</span> <span class="op">=</span> <span class="ident">usable_cap</span> <span class="op">/</span> <span class="number">2</span>; <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">final_len</span> { <span class="kw">let</span> <span class="ident">expected</span>: <span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">back</span> { (<span class="number">0</span>..<span class="ident">len</span>).<span class="ident">collect</span>() } <span class="kw">else</span> { (<span class="number">0</span>..<span class="ident">len</span>).<span class="ident">rev</span>().<span class="ident">collect</span>() }; <span class="kw">for</span> <span class="ident">tail_pos</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">usable_cap</span> { <span class="ident">tester</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="ident">tester</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="kw">if</span> <span class="ident">back</span> { <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> <span class="op">*</span> <span class="number">2</span> { <span class="ident">tester</span>.<span class="ident">push_front</span>(<span class="ident">i</span>); } <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">swap_remove_back</span>(<span class="ident">i</span>), <span class="prelude-val">Some</span>(<span class="ident">len</span> <span class="op">*</span> <span class="number">2</span> <span class="op">-</span> <span class="number">1</span> <span class="op">-</span> <span class="ident">i</span>)); } } <span class="kw">else</span> { <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> <span class="op">*</span> <span class="number">2</span> { <span class="ident">tester</span>.<span class="ident">push_back</span>(<span class="ident">i</span>); } <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span> <span class="op">-</span> <span class="ident">i</span>; <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">swap_remove_front</span>(<span class="ident">idx</span>), <span class="prelude-val">Some</span>(<span class="ident">len</span> <span class="op">*</span> <span class="number">2</span> <span class="op">-</span> <span class="number">1</span> <span class="op">-</span> <span class="ident">i</span>)); } } <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">head</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tester</span>, <span class="ident">expected</span>); } } } <span class="ident">test</span>(<span class="bool-val">true</span>); <span class="ident">test</span>(<span class="bool-val">false</span>); } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_insert</span>() { <span class="comment">// This test checks that every single combination of tail position, length, and</span> <span class="comment">// insertion position is tested. Capacity 15 should be large enough to cover every case.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tester</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="number">15</span>); <span class="comment">// can't guarantee we got 15, so have to get what we got.</span> <span class="comment">// 15 would be great, but we will definitely get 2^k - 1, for k >= 4, or else</span> <span class="comment">// this test isn't covering what it wants to</span> <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">capacity</span>(); <span class="comment">// len is the length *after* insertion</span> <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">1</span>..<span class="ident">cap</span> { <span class="comment">// 0, 1, 2, .., len - 1</span> <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> (<span class="number">0</span>..).<span class="ident">take</span>(<span class="ident">len</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">>></span>(); <span class="kw">for</span> <span class="ident">tail_pos</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> { <span class="kw">for</span> <span class="ident">to_insert</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="ident">tester</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="ident">tester</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="kw">if</span> <span class="ident">i</span> <span class="op">!=</span> <span class="ident">to_insert</span> { <span class="ident">tester</span>.<span class="ident">push_back</span>(<span class="ident">i</span>); } } <span class="ident">tester</span>.<span class="ident">insert</span>(<span class="ident">to_insert</span>, <span class="ident">to_insert</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">head</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tester</span>, <span class="ident">expected</span>); } } } } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_remove</span>() { <span class="comment">// This test checks that every single combination of tail position, length, and</span> <span class="comment">// removal position is tested. Capacity 15 should be large enough to cover every case.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tester</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="number">15</span>); <span class="comment">// can't guarantee we got 15, so have to get what we got.</span> <span class="comment">// 15 would be great, but we will definitely get 2^k - 1, for k >= 4, or else</span> <span class="comment">// this test isn't covering what it wants to</span> <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">capacity</span>(); <span class="comment">// len is the length *after* removal</span> <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> <span class="op">-</span> <span class="number">1</span> { <span class="comment">// 0, 1, 2, .., len - 1</span> <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> (<span class="number">0</span>..).<span class="ident">take</span>(<span class="ident">len</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">>></span>(); <span class="kw">for</span> <span class="ident">tail_pos</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> { <span class="kw">for</span> <span class="ident">to_remove</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> <span class="op">+</span> <span class="number">1</span> { <span class="ident">tester</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="ident">tester</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="ident">to_remove</span> { <span class="ident">tester</span>.<span class="ident">push_back</span>(<span class="number">1234</span>); } <span class="ident">tester</span>.<span class="ident">push_back</span>(<span class="ident">i</span>); } <span class="kw">if</span> <span class="ident">to_remove</span> <span class="op">==</span> <span class="ident">len</span> { <span class="ident">tester</span>.<span class="ident">push_back</span>(<span class="number">1234</span>); } <span class="ident">tester</span>.<span class="ident">remove</span>(<span class="ident">to_remove</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">head</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tester</span>, <span class="ident">expected</span>); } } } } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_drain</span>() { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tester</span>: <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="number">7</span>); <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">capacity</span>(); <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> <span class="op">+</span> <span class="number">1</span> { <span class="kw">for</span> <span class="ident">tail</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> <span class="op">+</span> <span class="number">1</span> { <span class="kw">for</span> <span class="ident">drain_start</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> <span class="op">+</span> <span class="number">1</span> { <span class="kw">for</span> <span class="ident">drain_end</span> <span class="kw">in</span> <span class="ident">drain_start</span>..<span class="ident">len</span> <span class="op">+</span> <span class="number">1</span> { <span class="ident">tester</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">tail</span>; <span class="ident">tester</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">tail</span>; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="ident">tester</span>.<span class="ident">push_back</span>(<span class="ident">i</span>); } <span class="comment">// Check that we drain the correct values</span> <span class="kw">let</span> <span class="ident">drained</span>: <span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">drain</span>(<span class="ident">drain_start</span>..<span class="ident">drain_end</span>).<span class="ident">collect</span>(); <span class="kw">let</span> <span class="ident">drained_expected</span>: <span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> (<span class="ident">drain_start</span>..<span class="ident">drain_end</span>).<span class="ident">collect</span>(); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">drained</span>, <span class="ident">drained_expected</span>); <span class="comment">// We shouldn't have changed the capacity or made the</span> <span class="comment">// head or tail out of bounds</span> <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">capacity</span>(), <span class="ident">cap</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">head</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="comment">// We should see the correct values in the VecDeque</span> <span class="kw">let</span> <span class="ident">expected</span>: <span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">drain_start</span>) .<span class="ident">chain</span>(<span class="ident">drain_end</span>..<span class="ident">len</span>) .<span class="ident">collect</span>(); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">expected</span>, <span class="ident">tester</span>); } } } } } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_shrink_to_fit</span>() { <span class="comment">// This test checks that every single combination of head and tail position,</span> <span class="comment">// is tested. Capacity 15 should be large enough to cover every case.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tester</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="number">15</span>); <span class="comment">// can't guarantee we got 15, so have to get what we got.</span> <span class="comment">// 15 would be great, but we will definitely get 2^k - 1, for k >= 4, or else</span> <span class="comment">// this test isn't covering what it wants to</span> <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">capacity</span>(); <span class="ident">tester</span>.<span class="ident">reserve</span>(<span class="number">63</span>); <span class="kw">let</span> <span class="ident">max_cap</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">capacity</span>(); <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> <span class="op">+</span> <span class="number">1</span> { <span class="comment">// 0, 1, 2, .., len - 1</span> <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> (<span class="number">0</span>..).<span class="ident">take</span>(<span class="ident">len</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">>></span>(); <span class="kw">for</span> <span class="ident">tail_pos</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">max_cap</span> <span class="op">+</span> <span class="number">1</span> { <span class="ident">tester</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="ident">tester</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="ident">tester</span>.<span class="ident">reserve</span>(<span class="number">63</span>); <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="ident">tester</span>.<span class="ident">push_back</span>(<span class="ident">i</span>); } <span class="ident">tester</span>.<span class="ident">shrink_to_fit</span>(); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">capacity</span>() <span class="op"><=</span> <span class="ident">cap</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">head</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tester</span>, <span class="ident">expected</span>); } } } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_split_off</span>() { <span class="comment">// This test checks that every single combination of tail position, length, and</span> <span class="comment">// split position is tested. Capacity 15 should be large enough to cover every case.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tester</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="number">15</span>); <span class="comment">// can't guarantee we got 15, so have to get what we got.</span> <span class="comment">// 15 would be great, but we will definitely get 2^k - 1, for k >= 4, or else</span> <span class="comment">// this test isn't covering what it wants to</span> <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">capacity</span>(); <span class="comment">// len is the length *before* splitting</span> <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> { <span class="comment">// index to split at</span> <span class="kw">for</span> <span class="ident">at</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> <span class="op">+</span> <span class="number">1</span> { <span class="comment">// 0, 1, 2, .., at - 1 (may be empty)</span> <span class="kw">let</span> <span class="ident">expected_self</span> <span class="op">=</span> (<span class="number">0</span>..).<span class="ident">take</span>(<span class="ident">at</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">>></span>(); <span class="comment">// at, at + 1, .., len - 1 (may be empty)</span> <span class="kw">let</span> <span class="ident">expected_other</span> <span class="op">=</span> (<span class="ident">at</span>..).<span class="ident">take</span>(<span class="ident">len</span> <span class="op">-</span> <span class="ident">at</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">VecDeque</span><span class="op"><</span>_<span class="op">>></span>(); <span class="kw">for</span> <span class="ident">tail_pos</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> { <span class="ident">tester</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="ident">tester</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">tail_pos</span>; <span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> { <span class="ident">tester</span>.<span class="ident">push_back</span>(<span class="ident">i</span>); } <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">tester</span>.<span class="ident">split_off</span>(<span class="ident">at</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tester</span>.<span class="ident">head</span> <span class="op"><</span> <span class="ident">tester</span>.<span class="ident">cap</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="ident">tail</span> <span class="op"><</span> <span class="ident">result</span>.<span class="ident">cap</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="ident">head</span> <span class="op"><</span> <span class="ident">result</span>.<span class="ident">cap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tester</span>, <span class="ident">expected_self</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="ident">expected_other</span>); } } } } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_from_vec</span>() { <span class="kw">use</span> <span class="kw">super</span>::<span class="kw">super</span>::<span class="ident">vec</span>::<span class="ident">Vec</span>; <span class="kw">for</span> <span class="ident">cap</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">35</span> { <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">cap</span> <span class="op">+</span> <span class="number">1</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vec</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">cap</span>); <span class="ident">vec</span>.<span class="ident">extend</span>(<span class="number">0</span>..<span class="ident">len</span>); <span class="kw">let</span> <span class="ident">vd</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">from</span>(<span class="ident">vec</span>.<span class="ident">clone</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">vd</span>.<span class="ident">cap</span>().<span class="ident">is_power_of_two</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">vd</span>.<span class="ident">len</span>(), <span class="ident">vec</span>.<span class="ident">len</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">vd</span>.<span class="ident">into_iter</span>().<span class="ident">eq</span>(<span class="ident">vec</span>)); } } } <span class="attribute">#[<span class="ident">test</span>]</span> <span class="kw">fn</span> <span class="ident">test_vec_from_vecdeque</span>() { <span class="kw">use</span> <span class="kw">super</span>::<span class="kw">super</span>::<span class="ident">vec</span>::<span class="ident">Vec</span>; <span class="kw">fn</span> <span class="ident">create_vec_and_test_convert</span>(<span class="ident">cap</span>: <span class="ident">usize</span>, <span class="ident">offset</span>: <span class="ident">usize</span>, <span class="ident">len</span>: <span class="ident">usize</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vd</span> <span class="op">=</span> <span class="ident">VecDeque</span>::<span class="ident">with_capacity</span>(<span class="ident">cap</span>); <span class="kw">for</span> _ <span class="kw">in</span> <span class="number">0</span>..<span class="ident">offset</span> { <span class="ident">vd</span>.<span class="ident">push_back</span>(<span class="number">0</span>); <span class="ident">vd</span>.<span class="ident">pop_front</span>(); } <span class="ident">vd</span>.<span class="ident">extend</span>(<span class="number">0</span>..<span class="ident">len</span>); <span class="kw">let</span> <span class="ident">vec</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">from</span>(<span class="ident">vd</span>.<span class="ident">clone</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">vec</span>.<span class="ident">len</span>(), <span class="ident">vd</span>.<span class="ident">len</span>()); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">vec</span>.<span class="ident">into_iter</span>().<span class="ident">eq</span>(<span class="ident">vd</span>)); } <span class="kw">for</span> <span class="ident">cap_pwr</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">7</span> { <span class="comment">// Make capacity as a (2^x)-1, so that the ring size is 2^x</span> <span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> (<span class="number">2i32</span>.<span class="ident">pow</span>(<span class="ident">cap_pwr</span>) <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">usize</span>; <span class="comment">// In these cases there is enough free space to solve it with copies</span> <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> <span class="number">0</span>..((<span class="ident">cap</span> <span class="op">+</span> <span class="number">1</span>) <span class="op">/</span> <span class="number">2</span>) { <span class="comment">// Test contiguous cases</span> <span class="kw">for</span> <span class="ident">offset</span> <span class="kw">in</span> <span class="number">0</span>..(<span class="ident">cap</span> <span class="op">-</span> <span class="ident">len</span>) { <span class="ident">create_vec_and_test_convert</span>(<span class="ident">cap</span>, <span class="ident">offset</span>, <span class="ident">len</span>) } <span class="comment">// Test cases where block at end of buffer is bigger than block at start</span> <span class="kw">for</span> <span class="ident">offset</span> <span class="kw">in</span> (<span class="ident">cap</span> <span class="op">-</span> <span class="ident">len</span>)..(<span class="ident">cap</span> <span class="op">-</span> (<span class="ident">len</span> <span class="op">/</span> <span class="number">2</span>)) { <span class="ident">create_vec_and_test_convert</span>(<span class="ident">cap</span>, <span class="ident">offset</span>, <span class="ident">len</span>) } <span class="comment">// Test cases where block at start of buffer is bigger than block at end</span> <span class="kw">for</span> <span class="ident">offset</span> <span class="kw">in</span> (<span class="ident">cap</span> <span class="op">-</span> (<span class="ident">len</span> <span class="op">/</span> <span class="number">2</span>))..<span class="ident">cap</span> { <span class="ident">create_vec_and_test_convert</span>(<span class="ident">cap</span>, <span class="ident">offset</span>, <span class="ident">len</span>) } } <span class="comment">// Now there's not (necessarily) space to straighten the ring with simple copies,</span> <span class="comment">// the ring will use swapping when:</span> <span class="comment">// (cap + 1 - offset) > (cap + 1 - len) && (len - (cap + 1 - offset)) > (cap + 1 - len))</span> <span class="comment">// right block size > free space && left block size > free space</span> <span class="kw">for</span> <span class="ident">len</span> <span class="kw">in</span> ((<span class="ident">cap</span> <span class="op">+</span> <span class="number">1</span>) <span class="op">/</span> <span class="number">2</span>)..<span class="ident">cap</span> { <span class="comment">// Test contiguous cases</span> <span class="kw">for</span> <span class="ident">offset</span> <span class="kw">in</span> <span class="number">0</span>..(<span class="ident">cap</span> <span class="op">-</span> <span class="ident">len</span>) { <span class="ident">create_vec_and_test_convert</span>(<span class="ident">cap</span>, <span class="ident">offset</span>, <span class="ident">len</span>) } <span class="comment">// Test cases where block at end of buffer is bigger than block at start</span> <span class="kw">for</span> <span class="ident">offset</span> <span class="kw">in</span> (<span class="ident">cap</span> <span class="op">-</span> <span class="ident">len</span>)..(<span class="ident">cap</span> <span class="op">-</span> (<span class="ident">len</span> <span class="op">/</span> <span class="number">2</span>)) { <span class="ident">create_vec_and_test_convert</span>(<span class="ident">cap</span>, <span class="ident">offset</span>, <span class="ident">len</span>) } <span class="comment">// Test cases where block at start of buffer is bigger than block at end</span> <span class="kw">for</span> <span class="ident">offset</span> <span class="kw">in</span> (<span class="ident">cap</span> <span class="op">-</span> (<span class="ident">len</span> <span class="op">/</span> <span class="number">2</span>))..<span class="ident">cap</span> { <span class="ident">create_vec_and_test_convert</span>(<span class="ident">cap</span>, <span class="ident">offset</span>, <span class="ident">len</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>?</dt> <dd>Show this help dialog</dd> <dt>S</dt> <dd>Focus the search field</dd> <dt>⇤</dt> <dd>Move up in search results</dd> <dt>⇥</dt> <dd>Move down in 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