| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/slab-0.4.8/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../slab/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../slab/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <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 id="1348">1348</span> |
| <span id="1349">1349</span> |
| <span id="1350">1350</span> |
| <span id="1351">1351</span> |
| <span id="1352">1352</span> |
| <span id="1353">1353</span> |
| <span id="1354">1354</span> |
| <span id="1355">1355</span> |
| <span id="1356">1356</span> |
| <span id="1357">1357</span> |
| <span id="1358">1358</span> |
| <span id="1359">1359</span> |
| <span id="1360">1360</span> |
| <span id="1361">1361</span> |
| <span id="1362">1362</span> |
| <span id="1363">1363</span> |
| <span id="1364">1364</span> |
| <span id="1365">1365</span> |
| <span id="1366">1366</span> |
| <span id="1367">1367</span> |
| <span id="1368">1368</span> |
| <span id="1369">1369</span> |
| <span id="1370">1370</span> |
| <span id="1371">1371</span> |
| <span id="1372">1372</span> |
| <span id="1373">1373</span> |
| <span id="1374">1374</span> |
| <span id="1375">1375</span> |
| <span id="1376">1376</span> |
| <span id="1377">1377</span> |
| <span id="1378">1378</span> |
| <span id="1379">1379</span> |
| <span id="1380">1380</span> |
| <span id="1381">1381</span> |
| <span id="1382">1382</span> |
| <span id="1383">1383</span> |
| <span id="1384">1384</span> |
| <span id="1385">1385</span> |
| <span id="1386">1386</span> |
| <span id="1387">1387</span> |
| <span id="1388">1388</span> |
| <span id="1389">1389</span> |
| <span id="1390">1390</span> |
| <span id="1391">1391</span> |
| <span id="1392">1392</span> |
| <span id="1393">1393</span> |
| <span id="1394">1394</span> |
| <span id="1395">1395</span> |
| <span id="1396">1396</span> |
| <span id="1397">1397</span> |
| <span id="1398">1398</span> |
| <span id="1399">1399</span> |
| <span id="1400">1400</span> |
| <span id="1401">1401</span> |
| <span id="1402">1402</span> |
| <span id="1403">1403</span> |
| <span id="1404">1404</span> |
| <span id="1405">1405</span> |
| <span id="1406">1406</span> |
| <span id="1407">1407</span> |
| <span id="1408">1408</span> |
| <span id="1409">1409</span> |
| <span id="1410">1410</span> |
| <span id="1411">1411</span> |
| <span id="1412">1412</span> |
| <span id="1413">1413</span> |
| <span id="1414">1414</span> |
| <span id="1415">1415</span> |
| <span id="1416">1416</span> |
| <span id="1417">1417</span> |
| <span id="1418">1418</span> |
| <span id="1419">1419</span> |
| <span id="1420">1420</span> |
| <span id="1421">1421</span> |
| <span id="1422">1422</span> |
| <span id="1423">1423</span> |
| <span id="1424">1424</span> |
| <span id="1425">1425</span> |
| <span id="1426">1426</span> |
| <span id="1427">1427</span> |
| <span id="1428">1428</span> |
| <span id="1429">1429</span> |
| <span id="1430">1430</span> |
| <span id="1431">1431</span> |
| <span id="1432">1432</span> |
| <span id="1433">1433</span> |
| <span id="1434">1434</span> |
| <span id="1435">1435</span> |
| <span id="1436">1436</span> |
| <span id="1437">1437</span> |
| <span id="1438">1438</span> |
| <span id="1439">1439</span> |
| <span id="1440">1440</span> |
| <span id="1441">1441</span> |
| <span id="1442">1442</span> |
| <span id="1443">1443</span> |
| <span id="1444">1444</span> |
| <span id="1445">1445</span> |
| <span id="1446">1446</span> |
| <span id="1447">1447</span> |
| <span id="1448">1448</span> |
| <span id="1449">1449</span> |
| <span id="1450">1450</span> |
| <span id="1451">1451</span> |
| <span id="1452">1452</span> |
| <span id="1453">1453</span> |
| <span id="1454">1454</span> |
| <span id="1455">1455</span> |
| <span id="1456">1456</span> |
| <span id="1457">1457</span> |
| <span id="1458">1458</span> |
| <span id="1459">1459</span> |
| <span id="1460">1460</span> |
| <span id="1461">1461</span> |
| <span id="1462">1462</span> |
| <span id="1463">1463</span> |
| <span id="1464">1464</span> |
| <span id="1465">1465</span> |
| <span id="1466">1466</span> |
| <span id="1467">1467</span> |
| <span id="1468">1468</span> |
| <span id="1469">1469</span> |
| <span id="1470">1470</span> |
| <span id="1471">1471</span> |
| <span id="1472">1472</span> |
| <span id="1473">1473</span> |
| <span id="1474">1474</span> |
| <span id="1475">1475</span> |
| <span id="1476">1476</span> |
| <span id="1477">1477</span> |
| <span id="1478">1478</span> |
| <span id="1479">1479</span> |
| <span id="1480">1480</span> |
| <span id="1481">1481</span> |
| <span id="1482">1482</span> |
| <span id="1483">1483</span> |
| <span id="1484">1484</span> |
| <span id="1485">1485</span> |
| <span id="1486">1486</span> |
| <span id="1487">1487</span> |
| <span id="1488">1488</span> |
| <span id="1489">1489</span> |
| <span id="1490">1490</span> |
| <span id="1491">1491</span> |
| <span id="1492">1492</span> |
| <span id="1493">1493</span> |
| <span id="1494">1494</span> |
| <span id="1495">1495</span> |
| <span id="1496">1496</span> |
| <span id="1497">1497</span> |
| <span id="1498">1498</span> |
| <span id="1499">1499</span> |
| <span id="1500">1500</span> |
| <span id="1501">1501</span> |
| <span id="1502">1502</span> |
| <span id="1503">1503</span> |
| <span id="1504">1504</span> |
| <span id="1505">1505</span> |
| <span id="1506">1506</span> |
| <span id="1507">1507</span> |
| <span id="1508">1508</span> |
| <span id="1509">1509</span> |
| <span id="1510">1510</span> |
| <span id="1511">1511</span> |
| <span id="1512">1512</span> |
| <span id="1513">1513</span> |
| <span id="1514">1514</span> |
| <span id="1515">1515</span> |
| <span id="1516">1516</span> |
| <span id="1517">1517</span> |
| <span id="1518">1518</span> |
| <span id="1519">1519</span> |
| <span id="1520">1520</span> |
| <span id="1521">1521</span> |
| <span id="1522">1522</span> |
| <span id="1523">1523</span> |
| <span id="1524">1524</span> |
| <span id="1525">1525</span> |
| <span id="1526">1526</span> |
| <span id="1527">1527</span> |
| <span id="1528">1528</span> |
| <span id="1529">1529</span> |
| <span id="1530">1530</span> |
| <span id="1531">1531</span> |
| <span id="1532">1532</span> |
| <span id="1533">1533</span> |
| <span id="1534">1534</span> |
| <span id="1535">1535</span> |
| <span id="1536">1536</span> |
| <span id="1537">1537</span> |
| <span id="1538">1538</span> |
| <span id="1539">1539</span> |
| <span id="1540">1540</span> |
| <span id="1541">1541</span> |
| <span id="1542">1542</span> |
| <span id="1543">1543</span> |
| <span id="1544">1544</span> |
| <span id="1545">1545</span> |
| <span id="1546">1546</span> |
| <span id="1547">1547</span> |
| <span id="1548">1548</span> |
| <span id="1549">1549</span> |
| <span id="1550">1550</span> |
| <span id="1551">1551</span> |
| <span id="1552">1552</span> |
| <span id="1553">1553</span> |
| <span id="1554">1554</span> |
| <span id="1555">1555</span> |
| <span id="1556">1556</span> |
| <span id="1557">1557</span> |
| <span id="1558">1558</span> |
| <span id="1559">1559</span> |
| <span id="1560">1560</span> |
| <span id="1561">1561</span> |
| <span id="1562">1562</span> |
| <span id="1563">1563</span> |
| <span id="1564">1564</span> |
| <span id="1565">1565</span> |
| <span id="1566">1566</span> |
| <span id="1567">1567</span> |
| <span id="1568">1568</span> |
| <span id="1569">1569</span> |
| <span id="1570">1570</span> |
| <span id="1571">1571</span> |
| </pre><pre class="rust"><code><span class="attribute">#![cfg_attr(not(feature = <span class="string">"std"</span>), no_std)] |
| #![warn( |
| missing_debug_implementations, |
| missing_docs, |
| rust_2018_idioms, |
| unreachable_pub |
| )] |
| #![doc(test( |
| no_crate_inject, |
| attr(deny(warnings, rust_2018_idioms), allow(dead_code, unused_variables)) |
| ))] |
| |
| </span><span class="doccomment">//! Pre-allocated storage for a uniform data type. |
| //! |
| //! `Slab` provides pre-allocated storage for a single data type. If many values |
| //! of a single type are being allocated, it can be more efficient to |
| //! pre-allocate the necessary storage. Since the size of the type is uniform, |
| //! memory fragmentation can be avoided. Storing, clearing, and lookup |
| //! operations become very cheap. |
| //! |
| //! While `Slab` may look like other Rust collections, it is not intended to be |
| //! used as a general purpose collection. The primary difference between `Slab` |
| //! and `Vec` is that `Slab` returns the key when storing the value. |
| //! |
| //! It is important to note that keys may be reused. In other words, once a |
| //! value associated with a given key is removed from a slab, that key may be |
| //! returned from future calls to `insert`. |
| //! |
| //! # Examples |
| //! |
| //! Basic storing and retrieval. |
| //! |
| //! ``` |
| //! # use slab::*; |
| //! let mut slab = Slab::new(); |
| //! |
| //! let hello = slab.insert("hello"); |
| //! let world = slab.insert("world"); |
| //! |
| //! assert_eq!(slab[hello], "hello"); |
| //! assert_eq!(slab[world], "world"); |
| //! |
| //! slab[world] = "earth"; |
| //! assert_eq!(slab[world], "earth"); |
| //! ``` |
| //! |
| //! Sometimes it is useful to be able to associate the key with the value being |
| //! inserted in the slab. This can be done with the `vacant_entry` API as such: |
| //! |
| //! ``` |
| //! # use slab::*; |
| //! let mut slab = Slab::new(); |
| //! |
| //! let hello = { |
| //! let entry = slab.vacant_entry(); |
| //! let key = entry.key(); |
| //! |
| //! entry.insert((key, "hello")); |
| //! key |
| //! }; |
| //! |
| //! assert_eq!(hello, slab[hello].0); |
| //! assert_eq!("hello", slab[hello].1); |
| //! ``` |
| //! |
| //! It is generally a good idea to specify the desired capacity of a slab at |
| //! creation time. Note that `Slab` will grow the internal capacity when |
| //! attempting to insert a new value once the existing capacity has been reached. |
| //! To avoid this, add a check. |
| //! |
| //! ``` |
| //! # use slab::*; |
| //! let mut slab = Slab::with_capacity(1024); |
| //! |
| //! // ... use the slab |
| //! |
| //! if slab.len() == slab.capacity() { |
| //! panic!("slab full"); |
| //! } |
| //! |
| //! slab.insert("the slab is not at capacity yet"); |
| //! ``` |
| //! |
| //! # Capacity and reallocation |
| //! |
| //! The capacity of a slab is the amount of space allocated for any future |
| //! values that will be inserted in the slab. This is not to be confused with |
| //! the *length* of the slab, which specifies the number of actual values |
| //! currently being inserted. If a slab's length is equal to its capacity, the |
| //! next value inserted into the slab will require growing the slab by |
| //! reallocating. |
| //! |
| //! For example, a slab with capacity 10 and length 0 would be an empty slab |
| //! with space for 10 more stored values. Storing 10 or fewer elements into the |
| //! slab will not change its capacity or cause reallocation to occur. However, |
| //! if the slab length is increased to 11 (due to another `insert`), it will |
| //! have to reallocate, which can be slow. For this reason, it is recommended to |
| //! use [`Slab::with_capacity`] whenever possible to specify how many values the |
| //! slab is expected to store. |
| //! |
| //! # Implementation |
| //! |
| //! `Slab` is backed by a `Vec` of slots. Each slot is either occupied or |
| //! vacant. `Slab` maintains a stack of vacant slots using a linked list. To |
| //! find a vacant slot, the stack is popped. When a slot is released, it is |
| //! pushed onto the stack. |
| //! |
| //! If there are no more available slots in the stack, then `Vec::reserve(1)` is |
| //! called and a new slot is created. |
| //! |
| //! [`Slab::with_capacity`]: struct.Slab.html#with_capacity |
| |
| </span><span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| </span><span class="kw">extern crate </span>alloc; |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">extern crate </span>std <span class="kw">as </span>alloc; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"serde"</span>)] |
| </span><span class="kw">mod </span>serde; |
| |
| <span class="kw">mod </span>builder; |
| |
| <span class="kw">use </span>alloc::vec::{<span class="self">self</span>, Vec}; |
| <span class="kw">use </span>core::iter::{<span class="self">self</span>, FromIterator, FusedIterator}; |
| <span class="kw">use </span>core::{fmt, mem, ops, slice}; |
| |
| <span class="doccomment">/// Pre-allocated storage for a uniform data type |
| /// |
| /// See the [module documentation] for more details. |
| /// |
| /// [module documentation]: index.html |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>Slab<T> { |
| <span class="comment">// Chunk of memory |
| </span>entries: Vec<Entry<T>>, |
| |
| <span class="comment">// Number of Filled elements currently in the slab |
| </span>len: usize, |
| |
| <span class="comment">// Offset of the next available slot in the slab. Set to the slab's |
| // capacity when the slab is full. |
| </span>next: usize, |
| } |
| |
| <span class="kw">impl</span><T> Default <span class="kw">for </span>Slab<T> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| Slab::new() |
| } |
| } |
| |
| <span class="doccomment">/// A handle to a vacant entry in a `Slab`. |
| /// |
| /// `VacantEntry` allows constructing values with the key that they will be |
| /// assigned to. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let hello = { |
| /// let entry = slab.vacant_entry(); |
| /// let key = entry.key(); |
| /// |
| /// entry.insert((key, "hello")); |
| /// key |
| /// }; |
| /// |
| /// assert_eq!(hello, slab[hello].0); |
| /// assert_eq!("hello", slab[hello].1); |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>VacantEntry<<span class="lifetime">'a</span>, T> { |
| slab: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Slab<T>, |
| key: usize, |
| } |
| |
| <span class="doccomment">/// A consuming iterator over the values stored in a `Slab` |
| </span><span class="kw">pub struct </span>IntoIter<T> { |
| entries: iter::Enumerate<vec::IntoIter<Entry<T>>>, |
| len: usize, |
| } |
| |
| <span class="doccomment">/// An iterator over the values stored in the `Slab` |
| </span><span class="kw">pub struct </span>Iter<<span class="lifetime">'a</span>, T> { |
| entries: iter::Enumerate<slice::Iter<<span class="lifetime">'a</span>, Entry<T>>>, |
| len: usize, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Clone <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| entries: <span class="self">self</span>.entries.clone(), |
| len: <span class="self">self</span>.len, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A mutable iterator over the values stored in the `Slab` |
| </span><span class="kw">pub struct </span>IterMut<<span class="lifetime">'a</span>, T> { |
| entries: iter::Enumerate<slice::IterMut<<span class="lifetime">'a</span>, Entry<T>>>, |
| len: usize, |
| } |
| |
| <span class="doccomment">/// A draining iterator for `Slab` |
| </span><span class="kw">pub struct </span>Drain<<span class="lifetime">'a</span>, T> { |
| inner: vec::Drain<<span class="lifetime">'a</span>, Entry<T>>, |
| len: usize, |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">enum </span>Entry<T> { |
| Vacant(usize), |
| Occupied(T), |
| } |
| |
| <span class="kw">impl</span><T> Slab<T> { |
| <span class="doccomment">/// Construct a new, empty `Slab`. |
| /// |
| /// The function does not allocate and the returned slab will have no |
| /// capacity until `insert` is called or capacity is explicitly reserved. |
| /// |
| /// This is `const fn` on Rust 1.39+. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let slab: Slab<i32> = Slab::new(); |
| /// ``` |
| </span><span class="attribute">#[cfg(not(slab_no_const_vec_new))] |
| </span><span class="kw">pub const fn </span>new() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| entries: Vec::new(), |
| next: <span class="number">0</span>, |
| len: <span class="number">0</span>, |
| } |
| } |
| <span class="doccomment">/// Construct a new, empty `Slab`. |
| /// |
| /// The function does not allocate and the returned slab will have no |
| /// capacity until `insert` is called or capacity is explicitly reserved. |
| /// |
| /// This is `const fn` on Rust 1.39+. |
| </span><span class="attribute">#[cfg(slab_no_const_vec_new)] |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| entries: Vec::new(), |
| next: <span class="number">0</span>, |
| len: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Construct a new, empty `Slab` with the specified capacity. |
| /// |
| /// The returned slab will be able to store exactly `capacity` without |
| /// reallocating. If `capacity` is 0, the slab will not allocate. |
| /// |
| /// It is important to note that this function does not specify the *length* |
| /// of the returned slab, but only the capacity. For an explanation of the |
| /// difference between length and capacity, see [Capacity and |
| /// reallocation](index.html#capacity-and-reallocation). |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::with_capacity(10); |
| /// |
| /// // The slab contains no values, even though it has capacity for more |
| /// assert_eq!(slab.len(), 0); |
| /// |
| /// // These are all done without reallocating... |
| /// for i in 0..10 { |
| /// slab.insert(i); |
| /// } |
| /// |
| /// // ...but this may make the slab reallocate |
| /// slab.insert(11); |
| /// ``` |
| </span><span class="kw">pub fn </span>with_capacity(capacity: usize) -> Slab<T> { |
| Slab { |
| entries: Vec::with_capacity(capacity), |
| next: <span class="number">0</span>, |
| len: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Return the number of values the slab can store without reallocating. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let slab: Slab<i32> = Slab::with_capacity(10); |
| /// assert_eq!(slab.capacity(), 10); |
| /// ``` |
| </span><span class="kw">pub fn </span>capacity(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.entries.capacity() |
| } |
| |
| <span class="doccomment">/// Reserve capacity for at least `additional` more values to be stored |
| /// without allocating. |
| /// |
| /// `reserve` does nothing if the slab already has sufficient capacity for |
| /// `additional` more values. If more capacity is required, a new segment of |
| /// memory will be allocated and all existing values will be copied into it. |
| /// As such, if the slab is already very large, a call to `reserve` can end |
| /// up being expensive. |
| /// |
| /// The slab may reserve more than `additional` extra space in order to |
| /// avoid frequent reallocations. Use `reserve_exact` instead to guarantee |
| /// that only the requested space is allocated. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the new capacity exceeds `isize::MAX` bytes. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// slab.insert("hello"); |
| /// slab.reserve(10); |
| /// assert!(slab.capacity() >= 11); |
| /// ``` |
| </span><span class="kw">pub fn </span>reserve(<span class="kw-2">&mut </span><span class="self">self</span>, additional: usize) { |
| <span class="kw">if </span><span class="self">self</span>.capacity() - <span class="self">self</span>.len >= additional { |
| <span class="kw">return</span>; |
| } |
| <span class="kw">let </span>need_add = additional - (<span class="self">self</span>.entries.len() - <span class="self">self</span>.len); |
| <span class="self">self</span>.entries.reserve(need_add); |
| } |
| |
| <span class="doccomment">/// Reserve the minimum capacity required to store exactly `additional` |
| /// more values. |
| /// |
| /// `reserve_exact` does nothing if the slab already has sufficient capacity |
| /// for `additional` more values. If more capacity is required, a new segment |
| /// of memory will be allocated and all existing values will be copied into |
| /// it. As such, if the slab is already very large, a call to `reserve` can |
| /// end up being expensive. |
| /// |
| /// Note that the allocator may give the slab more space than it requests. |
| /// Therefore capacity can not be relied upon to be precisely minimal. |
| /// Prefer `reserve` if future insertions are expected. |
| /// |
| /// # Panics |
| /// |
| /// Panics if the new capacity exceeds `isize::MAX` bytes. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// slab.insert("hello"); |
| /// slab.reserve_exact(10); |
| /// assert!(slab.capacity() >= 11); |
| /// ``` |
| </span><span class="kw">pub fn </span>reserve_exact(<span class="kw-2">&mut </span><span class="self">self</span>, additional: usize) { |
| <span class="kw">if </span><span class="self">self</span>.capacity() - <span class="self">self</span>.len >= additional { |
| <span class="kw">return</span>; |
| } |
| <span class="kw">let </span>need_add = additional - (<span class="self">self</span>.entries.len() - <span class="self">self</span>.len); |
| <span class="self">self</span>.entries.reserve_exact(need_add); |
| } |
| |
| <span class="doccomment">/// Shrink the capacity of the slab as much as possible without invalidating keys. |
| /// |
| /// Because values cannot be moved to a different index, the slab cannot |
| /// shrink past any stored values. |
| /// It will drop down as close as possible to the length but the allocator may |
| /// still inform the underlying vector that there is space for a few more elements. |
| /// |
| /// This function can take O(n) time even when the capacity cannot be reduced |
| /// or the allocation is shrunk in place. Repeated calls run in O(1) though. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::with_capacity(10); |
| /// |
| /// for i in 0..3 { |
| /// slab.insert(i); |
| /// } |
| /// |
| /// slab.shrink_to_fit(); |
| /// assert!(slab.capacity() >= 3 && slab.capacity() < 10); |
| /// ``` |
| /// |
| /// The slab cannot shrink past the last present value even if previous |
| /// values are removed: |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::with_capacity(10); |
| /// |
| /// for i in 0..4 { |
| /// slab.insert(i); |
| /// } |
| /// |
| /// slab.remove(0); |
| /// slab.remove(3); |
| /// |
| /// slab.shrink_to_fit(); |
| /// assert!(slab.capacity() >= 3 && slab.capacity() < 10); |
| /// ``` |
| </span><span class="kw">pub fn </span>shrink_to_fit(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// Remove all vacant entries after the last occupied one, so that |
| // the capacity can be reduced to what is actually needed. |
| // If the slab is empty the vector can simply be cleared, but that |
| // optimization would not affect time complexity when T: Drop. |
| </span><span class="kw">let </span>len_before = <span class="self">self</span>.entries.len(); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span>Entry::Vacant(<span class="kw">_</span>)) = <span class="self">self</span>.entries.last() { |
| <span class="self">self</span>.entries.pop(); |
| } |
| |
| <span class="comment">// Removing entries breaks the list of vacant entries, |
| // so it must be repaired |
| </span><span class="kw">if </span><span class="self">self</span>.entries.len() != len_before { |
| <span class="comment">// Some vacant entries were removed, so the list now likely¹ |
| // either contains references to the removed entries, or has an |
| // invalid end marker. Fix this by recreating the list. |
| </span><span class="self">self</span>.recreate_vacant_list(); |
| <span class="comment">// ¹: If the removed entries formed the tail of the list, with the |
| // most recently popped entry being the head of them, (so that its |
| // index is now the end marker) the list is still valid. |
| // Checking for that unlikely scenario of this infrequently called |
| // is not worth the code complexity. |
| </span>} |
| |
| <span class="self">self</span>.entries.shrink_to_fit(); |
| } |
| |
| <span class="doccomment">/// Iterate through all entries to recreate and repair the vacant list. |
| /// self.len must be correct and is not modified. |
| </span><span class="kw">fn </span>recreate_vacant_list(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.next = <span class="self">self</span>.entries.len(); |
| <span class="comment">// We can stop once we've found all vacant entries |
| </span><span class="kw">let </span><span class="kw-2">mut </span>remaining_vacant = <span class="self">self</span>.entries.len() - <span class="self">self</span>.len; |
| <span class="kw">if </span>remaining_vacant == <span class="number">0 </span>{ |
| <span class="kw">return</span>; |
| } |
| |
| <span class="comment">// Iterate in reverse order so that lower keys are at the start of |
| // the vacant list. This way future shrinks are more likely to be |
| // able to remove vacant entries. |
| </span><span class="kw">for </span>(i, entry) <span class="kw">in </span><span class="self">self</span>.entries.iter_mut().enumerate().rev() { |
| <span class="kw">if let </span>Entry::Vacant(<span class="kw-2">ref mut </span>next) = <span class="kw-2">*</span>entry { |
| <span class="kw-2">*</span>next = <span class="self">self</span>.next; |
| <span class="self">self</span>.next = i; |
| remaining_vacant -= <span class="number">1</span>; |
| <span class="kw">if </span>remaining_vacant == <span class="number">0 </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Reduce the capacity as much as possible, changing the key for elements when necessary. |
| /// |
| /// To allow updating references to the elements which must be moved to a new key, |
| /// this function takes a closure which is called before moving each element. |
| /// The second and third parameters to the closure are the current key and |
| /// new key respectively. |
| /// In case changing the key for one element turns out not to be possible, |
| /// the move can be cancelled by returning `false` from the closure. |
| /// In that case no further attempts at relocating elements is made. |
| /// If the closure unwinds, the slab will be left in a consistent state, |
| /// but the value that the closure panicked on might be removed. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// |
| /// let mut slab = Slab::with_capacity(10); |
| /// let a = slab.insert('a'); |
| /// slab.insert('b'); |
| /// slab.insert('c'); |
| /// slab.remove(a); |
| /// slab.compact(|&mut value, from, to| { |
| /// assert_eq!((value, from, to), ('c', 2, 0)); |
| /// true |
| /// }); |
| /// assert!(slab.capacity() >= 2 && slab.capacity() < 10); |
| /// ``` |
| /// |
| /// The value is not moved when the closure returns `Err`: |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// |
| /// let mut slab = Slab::with_capacity(100); |
| /// let a = slab.insert('a'); |
| /// let b = slab.insert('b'); |
| /// slab.remove(a); |
| /// slab.compact(|&mut value, from, to| false); |
| /// assert_eq!(slab.iter().next(), Some((b, &'b'))); |
| /// ``` |
| </span><span class="kw">pub fn </span>compact<F>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>rekey: F) |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&mut </span>T, usize, usize) -> bool, |
| { |
| <span class="comment">// If the closure unwinds, we need to restore a valid list of vacant entries |
| </span><span class="kw">struct </span>CleanupGuard<<span class="lifetime">'a</span>, T> { |
| slab: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Slab<T>, |
| decrement: bool, |
| } |
| <span class="kw">impl</span><T> Drop <span class="kw">for </span>CleanupGuard<<span class="lifetime">'_</span>, T> { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if </span><span class="self">self</span>.decrement { |
| <span class="comment">// Value was popped and not pushed back on |
| </span><span class="self">self</span>.slab.len -= <span class="number">1</span>; |
| } |
| <span class="self">self</span>.slab.recreate_vacant_list(); |
| } |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>guard = CleanupGuard { |
| slab: <span class="self">self</span>, |
| decrement: <span class="bool-val">true</span>, |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>occupied_until = <span class="number">0</span>; |
| <span class="comment">// While there are vacant entries |
| </span><span class="kw">while </span>guard.slab.entries.len() > guard.slab.len { |
| <span class="comment">// Find a value that needs to be moved, |
| // by popping entries until we find an occupied one. |
| // (entries cannot be empty because 0 is not greater than anything) |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(Entry::Occupied(<span class="kw-2">mut </span>value)) = guard.slab.entries.pop() { |
| <span class="comment">// Found one, now find a vacant entry to move it to |
| </span><span class="kw">while let </span><span class="prelude-val">Some</span>(<span class="kw-2">&</span>Entry::Occupied(<span class="kw">_</span>)) = guard.slab.entries.get(occupied_until) { |
| occupied_until += <span class="number">1</span>; |
| } |
| <span class="comment">// Let the caller try to update references to the key |
| </span><span class="kw">if </span>!rekey(<span class="kw-2">&mut </span>value, guard.slab.entries.len(), occupied_until) { |
| <span class="comment">// Changing the key failed, so push the entry back on at its old index. |
| </span>guard.slab.entries.push(Entry::Occupied(value)); |
| guard.decrement = <span class="bool-val">false</span>; |
| guard.slab.entries.shrink_to_fit(); |
| <span class="kw">return</span>; |
| <span class="comment">// Guard drop handles cleanup |
| </span>} |
| <span class="comment">// Put the value in its new spot |
| </span>guard.slab.entries[occupied_until] = Entry::Occupied(value); |
| <span class="comment">// ... and mark it as occupied (this is optional) |
| </span>occupied_until += <span class="number">1</span>; |
| } |
| } |
| guard.slab.next = guard.slab.len; |
| guard.slab.entries.shrink_to_fit(); |
| <span class="comment">// Normal cleanup is not necessary |
| </span>mem::forget(guard); |
| } |
| |
| <span class="doccomment">/// Clear the slab of all values. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// for i in 0..3 { |
| /// slab.insert(i); |
| /// } |
| /// |
| /// slab.clear(); |
| /// assert!(slab.is_empty()); |
| /// ``` |
| </span><span class="kw">pub fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.entries.clear(); |
| <span class="self">self</span>.len = <span class="number">0</span>; |
| <span class="self">self</span>.next = <span class="number">0</span>; |
| } |
| |
| <span class="doccomment">/// Return the number of stored values. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// for i in 0..3 { |
| /// slab.insert(i); |
| /// } |
| /// |
| /// assert_eq!(3, slab.len()); |
| /// ``` |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.len |
| } |
| |
| <span class="doccomment">/// Return `true` if there are no values stored in the slab. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// assert!(slab.is_empty()); |
| /// |
| /// slab.insert(1); |
| /// assert!(!slab.is_empty()); |
| /// ``` |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.len == <span class="number">0 |
| </span>} |
| |
| <span class="doccomment">/// Return an iterator over the slab. |
| /// |
| /// This function should generally be **avoided** as it is not efficient. |
| /// Iterators must iterate over every slot in the slab even if it is |
| /// vacant. As such, a slab with a capacity of 1 million but only one |
| /// stored value must still iterate the million slots. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// for i in 0..3 { |
| /// slab.insert(i); |
| /// } |
| /// |
| /// let mut iterator = slab.iter(); |
| /// |
| /// assert_eq!(iterator.next(), Some((0, &0))); |
| /// assert_eq!(iterator.next(), Some((1, &1))); |
| /// assert_eq!(iterator.next(), Some((2, &2))); |
| /// assert_eq!(iterator.next(), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> Iter<<span class="lifetime">'_</span>, T> { |
| Iter { |
| entries: <span class="self">self</span>.entries.iter().enumerate(), |
| len: <span class="self">self</span>.len, |
| } |
| } |
| |
| <span class="doccomment">/// Return an iterator that allows modifying each value. |
| /// |
| /// This function should generally be **avoided** as it is not efficient. |
| /// Iterators must iterate over every slot in the slab even if it is |
| /// vacant. As such, a slab with a capacity of 1 million but only one |
| /// stored value must still iterate the million slots. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let key1 = slab.insert(0); |
| /// let key2 = slab.insert(1); |
| /// |
| /// for (key, val) in slab.iter_mut() { |
| /// if key == key1 { |
| /// *val += 2; |
| /// } |
| /// } |
| /// |
| /// assert_eq!(slab[key1], 2); |
| /// assert_eq!(slab[key2], 1); |
| /// ``` |
| </span><span class="kw">pub fn </span>iter_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> IterMut<<span class="lifetime">'_</span>, T> { |
| IterMut { |
| entries: <span class="self">self</span>.entries.iter_mut().enumerate(), |
| len: <span class="self">self</span>.len, |
| } |
| } |
| |
| <span class="doccomment">/// Return a reference to the value associated with the given key. |
| /// |
| /// If the given key is not associated with a value, then `None` is |
| /// returned. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// let key = slab.insert("hello"); |
| /// |
| /// assert_eq!(slab.get(key), Some(&"hello")); |
| /// assert_eq!(slab.get(123), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>get(<span class="kw-2">&</span><span class="self">self</span>, key: usize) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>T> { |
| <span class="kw">match </span><span class="self">self</span>.entries.get(key) { |
| <span class="prelude-val">Some</span>(Entry::Occupied(val)) => <span class="prelude-val">Some</span>(val), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Return a mutable reference to the value associated with the given key. |
| /// |
| /// If the given key is not associated with a value, then `None` is |
| /// returned. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// let key = slab.insert("hello"); |
| /// |
| /// *slab.get_mut(key).unwrap() = "world"; |
| /// |
| /// assert_eq!(slab[key], "world"); |
| /// assert_eq!(slab.get_mut(123), None); |
| /// ``` |
| </span><span class="kw">pub fn </span>get_mut(<span class="kw-2">&mut </span><span class="self">self</span>, key: usize) -> <span class="prelude-ty">Option</span><<span class="kw-2">&mut </span>T> { |
| <span class="kw">match </span><span class="self">self</span>.entries.get_mut(key) { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>Entry::Occupied(<span class="kw-2">ref mut </span>val)) => <span class="prelude-val">Some</span>(val), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Return two mutable references to the values associated with the two |
| /// given keys simultaneously. |
| /// |
| /// If any one of the given keys is not associated with a value, then `None` |
| /// is returned. |
| /// |
| /// This function can be used to get two mutable references out of one slab, |
| /// so that you can manipulate both of them at the same time, eg. swap them. |
| /// |
| /// # Panics |
| /// |
| /// This function will panic if `key1` and `key2` are the same. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// use std::mem; |
| /// |
| /// let mut slab = Slab::new(); |
| /// let key1 = slab.insert(1); |
| /// let key2 = slab.insert(2); |
| /// let (value1, value2) = slab.get2_mut(key1, key2).unwrap(); |
| /// mem::swap(value1, value2); |
| /// assert_eq!(slab[key1], 2); |
| /// assert_eq!(slab[key2], 1); |
| /// ``` |
| </span><span class="kw">pub fn </span>get2_mut(<span class="kw-2">&mut </span><span class="self">self</span>, key1: usize, key2: usize) -> <span class="prelude-ty">Option</span><(<span class="kw-2">&mut </span>T, <span class="kw-2">&mut </span>T)> { |
| <span class="macro">assert!</span>(key1 != key2); |
| |
| <span class="kw">let </span>(entry1, entry2); |
| |
| <span class="kw">if </span>key1 > key2 { |
| <span class="kw">let </span>(slice1, slice2) = <span class="self">self</span>.entries.split_at_mut(key1); |
| entry1 = slice2.get_mut(<span class="number">0</span>); |
| entry2 = slice1.get_mut(key2); |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>(slice1, slice2) = <span class="self">self</span>.entries.split_at_mut(key2); |
| entry1 = slice1.get_mut(key1); |
| entry2 = slice2.get_mut(<span class="number">0</span>); |
| } |
| |
| <span class="kw">match </span>(entry1, entry2) { |
| ( |
| <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>Entry::Occupied(<span class="kw-2">ref mut </span>val1)), |
| <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>Entry::Occupied(<span class="kw-2">ref mut </span>val2)), |
| ) => <span class="prelude-val">Some</span>((val1, val2)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Return a reference to the value associated with the given key without |
| /// performing bounds checking. |
| /// |
| /// For a safe alternative see [`get`](Slab::get). |
| /// |
| /// This function should be used with care. |
| /// |
| /// # Safety |
| /// |
| /// The key must be within bounds. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// let key = slab.insert(2); |
| /// |
| /// unsafe { |
| /// assert_eq!(slab.get_unchecked(key), &2); |
| /// } |
| /// ``` |
| </span><span class="kw">pub unsafe fn </span>get_unchecked(<span class="kw-2">&</span><span class="self">self</span>, key: usize) -> <span class="kw-2">&</span>T { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self</span>.entries.get_unchecked(key) { |
| Entry::Occupied(<span class="kw-2">ref </span>val) => val, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="doccomment">/// Return a mutable reference to the value associated with the given key |
| /// without performing bounds checking. |
| /// |
| /// For a safe alternative see [`get_mut`](Slab::get_mut). |
| /// |
| /// This function should be used with care. |
| /// |
| /// # Safety |
| /// |
| /// The key must be within bounds. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// let key = slab.insert(2); |
| /// |
| /// unsafe { |
| /// let val = slab.get_unchecked_mut(key); |
| /// *val = 13; |
| /// } |
| /// |
| /// assert_eq!(slab[key], 13); |
| /// ``` |
| </span><span class="kw">pub unsafe fn </span>get_unchecked_mut(<span class="kw-2">&mut </span><span class="self">self</span>, key: usize) -> <span class="kw-2">&mut </span>T { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self</span>.entries.get_unchecked_mut(key) { |
| Entry::Occupied(<span class="kw-2">ref mut </span>val) => val, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="doccomment">/// Return two mutable references to the values associated with the two |
| /// given keys simultaneously without performing bounds checking and safety |
| /// condition checking. |
| /// |
| /// For a safe alternative see [`get2_mut`](Slab::get2_mut). |
| /// |
| /// This function should be used with care. |
| /// |
| /// # Safety |
| /// |
| /// - Both keys must be within bounds. |
| /// - The condition `key1 != key2` must hold. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// use std::mem; |
| /// |
| /// let mut slab = Slab::new(); |
| /// let key1 = slab.insert(1); |
| /// let key2 = slab.insert(2); |
| /// let (value1, value2) = unsafe { slab.get2_unchecked_mut(key1, key2) }; |
| /// mem::swap(value1, value2); |
| /// assert_eq!(slab[key1], 2); |
| /// assert_eq!(slab[key2], 1); |
| /// ``` |
| </span><span class="kw">pub unsafe fn </span>get2_unchecked_mut(<span class="kw-2">&mut </span><span class="self">self</span>, key1: usize, key2: usize) -> (<span class="kw-2">&mut </span>T, <span class="kw-2">&mut </span>T) { |
| <span class="macro">debug_assert_ne!</span>(key1, key2); |
| <span class="kw">let </span>ptr = <span class="self">self</span>.entries.as_mut_ptr(); |
| <span class="kw">let </span>ptr1 = ptr.add(key1); |
| <span class="kw">let </span>ptr2 = ptr.add(key2); |
| <span class="kw">match </span>(<span class="kw-2">&mut *</span>ptr1, <span class="kw-2">&mut *</span>ptr2) { |
| (<span class="kw-2">&mut </span>Entry::Occupied(<span class="kw-2">ref mut </span>val1), <span class="kw-2">&mut </span>Entry::Occupied(<span class="kw-2">ref mut </span>val2)) => { |
| (val1, val2) |
| } |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="doccomment">/// Get the key for an element in the slab. |
| /// |
| /// The reference must point to an element owned by the slab. |
| /// Otherwise this function will panic. |
| /// This is a constant-time operation because the key can be calculated |
| /// from the reference with pointer arithmetic. |
| /// |
| /// # Panics |
| /// |
| /// This function will panic if the reference does not point to an element |
| /// of the slab. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// |
| /// let mut slab = Slab::new(); |
| /// let key = slab.insert(String::from("foo")); |
| /// let value = &slab[key]; |
| /// assert_eq!(slab.key_of(value), key); |
| /// ``` |
| /// |
| /// Values are not compared, so passing a reference to a different location |
| /// will result in a panic: |
| /// |
| /// ```should_panic |
| /// # use slab::*; |
| /// |
| /// let mut slab = Slab::new(); |
| /// let key = slab.insert(0); |
| /// let bad = &0; |
| /// slab.key_of(bad); // this will panic |
| /// unreachable!(); |
| /// ``` |
| </span><span class="attribute">#[cfg_attr(not(slab_no_track_caller), track_caller)] |
| </span><span class="kw">pub fn </span>key_of(<span class="kw-2">&</span><span class="self">self</span>, present_element: <span class="kw-2">&</span>T) -> usize { |
| <span class="kw">let </span>element_ptr = present_element <span class="kw">as </span><span class="kw-2">*const </span>T <span class="kw">as </span>usize; |
| <span class="kw">let </span>base_ptr = <span class="self">self</span>.entries.as_ptr() <span class="kw">as </span>usize; |
| <span class="comment">// Use wrapping subtraction in case the reference is bad |
| </span><span class="kw">let </span>byte_offset = element_ptr.wrapping_sub(base_ptr); |
| <span class="comment">// The division rounds away any offset of T inside Entry |
| // The size of Entry<T> is never zero even if T is due to Vacant(usize) |
| </span><span class="kw">let </span>key = byte_offset / mem::size_of::<Entry<T>>(); |
| <span class="comment">// Prevent returning unspecified (but out of bounds) values |
| </span><span class="kw">if </span>key >= <span class="self">self</span>.entries.len() { |
| <span class="macro">panic!</span>(<span class="string">"The reference points to a value outside this slab"</span>); |
| } |
| <span class="comment">// The reference cannot point to a vacant entry, because then it would not be valid |
| </span>key |
| } |
| |
| <span class="doccomment">/// Insert a value in the slab, returning key assigned to the value. |
| /// |
| /// The returned key can later be used to retrieve or remove the value using indexed |
| /// lookup and `remove`. Additional capacity is allocated if needed. See |
| /// [Capacity and reallocation](index.html#capacity-and-reallocation). |
| /// |
| /// # Panics |
| /// |
| /// Panics if the new storage in the vector exceeds `isize::MAX` bytes. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// let key = slab.insert("hello"); |
| /// assert_eq!(slab[key], "hello"); |
| /// ``` |
| </span><span class="kw">pub fn </span>insert(<span class="kw-2">&mut </span><span class="self">self</span>, val: T) -> usize { |
| <span class="kw">let </span>key = <span class="self">self</span>.next; |
| |
| <span class="self">self</span>.insert_at(key, val); |
| |
| key |
| } |
| |
| <span class="doccomment">/// Returns the key of the next vacant entry. |
| /// |
| /// This function returns the key of the vacant entry which will be used |
| /// for the next insertion. This is equivalent to |
| /// `slab.vacant_entry().key()`, but it doesn't require mutable access. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// assert_eq!(slab.vacant_key(), 0); |
| /// |
| /// slab.insert(0); |
| /// assert_eq!(slab.vacant_key(), 1); |
| /// |
| /// slab.insert(1); |
| /// slab.remove(0); |
| /// assert_eq!(slab.vacant_key(), 0); |
| /// ``` |
| </span><span class="kw">pub fn </span>vacant_key(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.next |
| } |
| |
| <span class="doccomment">/// Return a handle to a vacant entry allowing for further manipulation. |
| /// |
| /// This function is useful when creating values that must contain their |
| /// slab key. The returned `VacantEntry` reserves a slot in the slab and is |
| /// able to query the associated key. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let hello = { |
| /// let entry = slab.vacant_entry(); |
| /// let key = entry.key(); |
| /// |
| /// entry.insert((key, "hello")); |
| /// key |
| /// }; |
| /// |
| /// assert_eq!(hello, slab[hello].0); |
| /// assert_eq!("hello", slab[hello].1); |
| /// ``` |
| </span><span class="kw">pub fn </span>vacant_entry(<span class="kw-2">&mut </span><span class="self">self</span>) -> VacantEntry<<span class="lifetime">'_</span>, T> { |
| VacantEntry { |
| key: <span class="self">self</span>.next, |
| slab: <span class="self">self</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>insert_at(<span class="kw-2">&mut </span><span class="self">self</span>, key: usize, val: T) { |
| <span class="self">self</span>.len += <span class="number">1</span>; |
| |
| <span class="kw">if </span>key == <span class="self">self</span>.entries.len() { |
| <span class="self">self</span>.entries.push(Entry::Occupied(val)); |
| <span class="self">self</span>.next = key + <span class="number">1</span>; |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.next = <span class="kw">match </span><span class="self">self</span>.entries.get(key) { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span>Entry::Vacant(next)) => next, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| }; |
| <span class="self">self</span>.entries[key] = Entry::Occupied(val); |
| } |
| } |
| |
| <span class="doccomment">/// Tries to remove the value associated with the given key, |
| /// returning the value if the key existed. |
| /// |
| /// The key is then released and may be associated with future stored |
| /// values. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let hello = slab.insert("hello"); |
| /// |
| /// assert_eq!(slab.try_remove(hello), Some("hello")); |
| /// assert!(!slab.contains(hello)); |
| /// ``` |
| </span><span class="kw">pub fn </span>try_remove(<span class="kw-2">&mut </span><span class="self">self</span>, key: usize) -> <span class="prelude-ty">Option</span><T> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(entry) = <span class="self">self</span>.entries.get_mut(key) { |
| <span class="comment">// Swap the entry at the provided value |
| </span><span class="kw">let </span>prev = mem::replace(entry, Entry::Vacant(<span class="self">self</span>.next)); |
| |
| <span class="kw">match </span>prev { |
| Entry::Occupied(val) => { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="self">self</span>.next = key; |
| <span class="kw">return </span>val.into(); |
| } |
| <span class="kw">_ </span>=> { |
| <span class="comment">// Woops, the entry is actually vacant, restore the state |
| </span><span class="kw-2">*</span>entry = prev; |
| } |
| } |
| } |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="doccomment">/// Remove and return the value associated with the given key. |
| /// |
| /// The key is then released and may be associated with future stored |
| /// values. |
| /// |
| /// # Panics |
| /// |
| /// Panics if `key` is not associated with a value. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let hello = slab.insert("hello"); |
| /// |
| /// assert_eq!(slab.remove(hello), "hello"); |
| /// assert!(!slab.contains(hello)); |
| /// ``` |
| </span><span class="attribute">#[cfg_attr(not(slab_no_track_caller), track_caller)] |
| </span><span class="kw">pub fn </span>remove(<span class="kw-2">&mut </span><span class="self">self</span>, key: usize) -> T { |
| <span class="self">self</span>.try_remove(key).expect(<span class="string">"invalid key"</span>) |
| } |
| |
| <span class="doccomment">/// Return `true` if a value is associated with the given key. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let hello = slab.insert("hello"); |
| /// assert!(slab.contains(hello)); |
| /// |
| /// slab.remove(hello); |
| /// |
| /// assert!(!slab.contains(hello)); |
| /// ``` |
| </span><span class="kw">pub fn </span>contains(<span class="kw-2">&</span><span class="self">self</span>, key: usize) -> bool { |
| <span class="kw">match </span><span class="self">self</span>.entries.get(key) { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span>Entry::Occupied(<span class="kw">_</span>)) => <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Retain only the elements specified by the predicate. |
| /// |
| /// In other words, remove all elements `e` such that `f(usize, &mut e)` |
| /// returns false. This method operates in place and preserves the key |
| /// associated with the retained values. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let k1 = slab.insert(0); |
| /// let k2 = slab.insert(1); |
| /// let k3 = slab.insert(2); |
| /// |
| /// slab.retain(|key, val| key == k1 || *val == 1); |
| /// |
| /// assert!(slab.contains(k1)); |
| /// assert!(slab.contains(k2)); |
| /// assert!(!slab.contains(k3)); |
| /// |
| /// assert_eq!(2, slab.len()); |
| /// ``` |
| </span><span class="kw">pub fn </span>retain<F>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F) |
| <span class="kw">where |
| </span>F: FnMut(usize, <span class="kw-2">&mut </span>T) -> bool, |
| { |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="self">self</span>.entries.len() { |
| <span class="kw">let </span>keep = <span class="kw">match </span><span class="self">self</span>.entries[i] { |
| Entry::Occupied(<span class="kw-2">ref mut </span>v) => f(i, v), |
| <span class="kw">_ </span>=> <span class="bool-val">true</span>, |
| }; |
| |
| <span class="kw">if </span>!keep { |
| <span class="self">self</span>.remove(i); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Return a draining iterator that removes all elements from the slab and |
| /// yields the removed items. |
| /// |
| /// Note: Elements are removed even if the iterator is only partially |
| /// consumed or not consumed at all. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let _ = slab.insert(0); |
| /// let _ = slab.insert(1); |
| /// let _ = slab.insert(2); |
| /// |
| /// { |
| /// let mut drain = slab.drain(); |
| /// |
| /// assert_eq!(Some(0), drain.next()); |
| /// assert_eq!(Some(1), drain.next()); |
| /// assert_eq!(Some(2), drain.next()); |
| /// assert_eq!(None, drain.next()); |
| /// } |
| /// |
| /// assert!(slab.is_empty()); |
| /// ``` |
| </span><span class="kw">pub fn </span>drain(<span class="kw-2">&mut </span><span class="self">self</span>) -> Drain<<span class="lifetime">'_</span>, T> { |
| <span class="kw">let </span>old_len = <span class="self">self</span>.len; |
| <span class="self">self</span>.len = <span class="number">0</span>; |
| <span class="self">self</span>.next = <span class="number">0</span>; |
| Drain { |
| inner: <span class="self">self</span>.entries.drain(..), |
| len: old_len, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> ops::Index<usize> <span class="kw">for </span>Slab<T> { |
| <span class="kw">type </span>Output = T; |
| |
| <span class="attribute">#[cfg_attr(not(slab_no_track_caller), track_caller)] |
| </span><span class="kw">fn </span>index(<span class="kw-2">&</span><span class="self">self</span>, key: usize) -> <span class="kw-2">&</span>T { |
| <span class="kw">match </span><span class="self">self</span>.entries.get(key) { |
| <span class="prelude-val">Some</span>(Entry::Occupied(v)) => v, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid key"</span>), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> ops::IndexMut<usize> <span class="kw">for </span>Slab<T> { |
| <span class="attribute">#[cfg_attr(not(slab_no_track_caller), track_caller)] |
| </span><span class="kw">fn </span>index_mut(<span class="kw-2">&mut </span><span class="self">self</span>, key: usize) -> <span class="kw-2">&mut </span>T { |
| <span class="kw">match </span><span class="self">self</span>.entries.get_mut(key) { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>Entry::Occupied(<span class="kw-2">ref mut </span>v)) => v, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid key"</span>), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> IntoIterator <span class="kw">for </span>Slab<T> { |
| <span class="kw">type </span>Item = (usize, T); |
| <span class="kw">type </span>IntoIter = IntoIter<T>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> IntoIter<T> { |
| IntoIter { |
| entries: <span class="self">self</span>.entries.into_iter().enumerate(), |
| len: <span class="self">self</span>.len, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>Slab<T> { |
| <span class="kw">type </span>Item = (usize, <span class="kw-2">&</span><span class="lifetime">'a </span>T); |
| <span class="kw">type </span>IntoIter = Iter<<span class="lifetime">'a</span>, T>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> Iter<<span class="lifetime">'a</span>, T> { |
| <span class="self">self</span>.iter() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Slab<T> { |
| <span class="kw">type </span>Item = (usize, <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T); |
| <span class="kw">type </span>IntoIter = IterMut<<span class="lifetime">'a</span>, T>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> IterMut<<span class="lifetime">'a</span>, T> { |
| <span class="self">self</span>.iter_mut() |
| } |
| } |
| |
| <span class="doccomment">/// Create a slab from an iterator of key-value pairs. |
| /// |
| /// If the iterator produces duplicate keys, the previous value is replaced with the later one. |
| /// The keys does not need to be sorted beforehand, and this function always |
| /// takes O(n) time. |
| /// Note that the returned slab will use space proportional to the largest key, |
| /// so don't use `Slab` with untrusted keys. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// |
| /// let vec = vec![(2,'a'), (6,'b'), (7,'c')]; |
| /// let slab = vec.into_iter().collect::<Slab<char>>(); |
| /// assert_eq!(slab.len(), 3); |
| /// assert!(slab.capacity() >= 8); |
| /// assert_eq!(slab[2], 'a'); |
| /// ``` |
| /// |
| /// With duplicate and unsorted keys: |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// |
| /// let vec = vec![(20,'a'), (10,'b'), (11,'c'), (10,'d')]; |
| /// let slab = vec.into_iter().collect::<Slab<char>>(); |
| /// assert_eq!(slab.len(), 3); |
| /// assert_eq!(slab[10], 'd'); |
| /// ``` |
| </span><span class="kw">impl</span><T> FromIterator<(usize, T)> <span class="kw">for </span>Slab<T> { |
| <span class="kw">fn </span>from_iter<I>(iterable: I) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>I: IntoIterator<Item = (usize, T)>, |
| { |
| <span class="kw">let </span>iterator = iterable.into_iter(); |
| <span class="kw">let </span><span class="kw-2">mut </span>builder = builder::Builder::with_capacity(iterator.size_hint().<span class="number">0</span>); |
| |
| <span class="kw">for </span>(key, value) <span class="kw">in </span>iterator { |
| builder.pair(key, value) |
| } |
| builder.build() |
| } |
| } |
| |
| <span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>Slab<T> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="kw">if </span>fmt.alternate() { |
| fmt.debug_map().entries(<span class="self">self</span>.iter()).finish() |
| } <span class="kw">else </span>{ |
| fmt.debug_struct(<span class="string">"Slab"</span>) |
| .field(<span class="string">"len"</span>, <span class="kw-2">&</span><span class="self">self</span>.len) |
| .field(<span class="string">"cap"</span>, <span class="kw-2">&</span><span class="self">self</span>.capacity()) |
| .finish() |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>IntoIter<T> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt.debug_struct(<span class="string">"IntoIter"</span>) |
| .field(<span class="string">"remaining"</span>, <span class="kw-2">&</span><span class="self">self</span>.len) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>Iter<<span class="lifetime">'_</span>, T> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt.debug_struct(<span class="string">"Iter"</span>) |
| .field(<span class="string">"remaining"</span>, <span class="kw-2">&</span><span class="self">self</span>.len) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>IterMut<<span class="lifetime">'_</span>, T> |
| <span class="kw">where |
| </span>T: fmt::Debug, |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt.debug_struct(<span class="string">"IterMut"</span>) |
| .field(<span class="string">"remaining"</span>, <span class="kw-2">&</span><span class="self">self</span>.len) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>Drain<<span class="lifetime">'_</span>, T> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| fmt.debug_struct(<span class="string">"Drain"</span>).finish() |
| } |
| } |
| |
| <span class="comment">// ===== VacantEntry ===== |
| |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>, T> VacantEntry<<span class="lifetime">'a</span>, T> { |
| <span class="doccomment">/// Insert a value in the entry, returning a mutable reference to the value. |
| /// |
| /// To get the key associated with the value, use `key` prior to calling |
| /// `insert`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let hello = { |
| /// let entry = slab.vacant_entry(); |
| /// let key = entry.key(); |
| /// |
| /// entry.insert((key, "hello")); |
| /// key |
| /// }; |
| /// |
| /// assert_eq!(hello, slab[hello].0); |
| /// assert_eq!("hello", slab[hello].1); |
| /// ``` |
| </span><span class="kw">pub fn </span>insert(<span class="self">self</span>, val: T) -> <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T { |
| <span class="self">self</span>.slab.insert_at(<span class="self">self</span>.key, val); |
| |
| <span class="kw">match </span><span class="self">self</span>.slab.entries.get_mut(<span class="self">self</span>.key) { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span>Entry::Occupied(<span class="kw-2">ref mut </span>v)) => v, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="doccomment">/// Return the key associated with this entry. |
| /// |
| /// A value stored in this entry will be associated with this key. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # use slab::*; |
| /// let mut slab = Slab::new(); |
| /// |
| /// let hello = { |
| /// let entry = slab.vacant_entry(); |
| /// let key = entry.key(); |
| /// |
| /// entry.insert((key, "hello")); |
| /// key |
| /// }; |
| /// |
| /// assert_eq!(hello, slab[hello].0); |
| /// assert_eq!("hello", slab[hello].1); |
| /// ``` |
| </span><span class="kw">pub fn </span>key(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.key |
| } |
| } |
| |
| <span class="comment">// ===== IntoIter ===== |
| |
| </span><span class="kw">impl</span><T> Iterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">type </span>Item = (usize, T); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">for </span>(key, entry) <span class="kw">in </span><span class="kw-2">&mut </span><span class="self">self</span>.entries { |
| <span class="kw">if let </span>Entry::Occupied(v) = entry { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((key, v)); |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.len, <span class="number">0</span>); |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len, <span class="prelude-val">Some</span>(<span class="self">self</span>.len)) |
| } |
| } |
| |
| <span class="kw">impl</span><T> DoubleEndedIterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((key, entry)) = <span class="self">self</span>.entries.next_back() { |
| <span class="kw">if let </span>Entry::Occupied(v) = entry { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((key, v)); |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.len, <span class="number">0</span>); |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">impl</span><T> ExactSizeIterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.len |
| } |
| } |
| |
| <span class="kw">impl</span><T> FusedIterator <span class="kw">for </span>IntoIter<T> {} |
| |
| <span class="comment">// ===== Iter ===== |
| |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>, T> Iterator <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, T> { |
| <span class="kw">type </span>Item = (usize, <span class="kw-2">&</span><span class="lifetime">'a </span>T); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">for </span>(key, entry) <span class="kw">in </span><span class="kw-2">&mut </span><span class="self">self</span>.entries { |
| <span class="kw">if let </span>Entry::Occupied(<span class="kw-2">ref </span>v) = <span class="kw-2">*</span>entry { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((key, v)); |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.len, <span class="number">0</span>); |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len, <span class="prelude-val">Some</span>(<span class="self">self</span>.len)) |
| } |
| } |
| |
| <span class="kw">impl</span><T> DoubleEndedIterator <span class="kw">for </span>Iter<<span class="lifetime">'_</span>, T> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((key, entry)) = <span class="self">self</span>.entries.next_back() { |
| <span class="kw">if let </span>Entry::Occupied(<span class="kw-2">ref </span>v) = <span class="kw-2">*</span>entry { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((key, v)); |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.len, <span class="number">0</span>); |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">impl</span><T> ExactSizeIterator <span class="kw">for </span>Iter<<span class="lifetime">'_</span>, T> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.len |
| } |
| } |
| |
| <span class="kw">impl</span><T> FusedIterator <span class="kw">for </span>Iter<<span class="lifetime">'_</span>, T> {} |
| |
| <span class="comment">// ===== IterMut ===== |
| |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>, T> Iterator <span class="kw">for </span>IterMut<<span class="lifetime">'a</span>, T> { |
| <span class="kw">type </span>Item = (usize, <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T); |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">for </span>(key, entry) <span class="kw">in </span><span class="kw-2">&mut </span><span class="self">self</span>.entries { |
| <span class="kw">if let </span>Entry::Occupied(<span class="kw-2">ref mut </span>v) = <span class="kw-2">*</span>entry { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((key, v)); |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.len, <span class="number">0</span>); |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len, <span class="prelude-val">Some</span>(<span class="self">self</span>.len)) |
| } |
| } |
| |
| <span class="kw">impl</span><T> DoubleEndedIterator <span class="kw">for </span>IterMut<<span class="lifetime">'_</span>, T> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>((key, entry)) = <span class="self">self</span>.entries.next_back() { |
| <span class="kw">if let </span>Entry::Occupied(<span class="kw-2">ref mut </span>v) = <span class="kw-2">*</span>entry { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((key, v)); |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.len, <span class="number">0</span>); |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">impl</span><T> ExactSizeIterator <span class="kw">for </span>IterMut<<span class="lifetime">'_</span>, T> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.len |
| } |
| } |
| |
| <span class="kw">impl</span><T> FusedIterator <span class="kw">for </span>IterMut<<span class="lifetime">'_</span>, T> {} |
| |
| <span class="comment">// ===== Drain ===== |
| |
| </span><span class="kw">impl</span><T> Iterator <span class="kw">for </span>Drain<<span class="lifetime">'_</span>, T> { |
| <span class="kw">type </span>Item = T; |
| |
| <span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">for </span>entry <span class="kw">in </span><span class="kw-2">&mut </span><span class="self">self</span>.inner { |
| <span class="kw">if let </span>Entry::Occupied(v) = entry { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="kw">return </span><span class="prelude-val">Some</span>(v); |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.len, <span class="number">0</span>); |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.len, <span class="prelude-val">Some</span>(<span class="self">self</span>.len)) |
| } |
| } |
| |
| <span class="kw">impl</span><T> DoubleEndedIterator <span class="kw">for </span>Drain<<span class="lifetime">'_</span>, T> { |
| <span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(entry) = <span class="self">self</span>.inner.next_back() { |
| <span class="kw">if let </span>Entry::Occupied(v) = entry { |
| <span class="self">self</span>.len -= <span class="number">1</span>; |
| <span class="kw">return </span><span class="prelude-val">Some</span>(v); |
| } |
| } |
| |
| <span class="macro">debug_assert_eq!</span>(<span class="self">self</span>.len, <span class="number">0</span>); |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">impl</span><T> ExactSizeIterator <span class="kw">for </span>Drain<<span class="lifetime">'_</span>, T> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.len |
| } |
| } |
| |
| <span class="kw">impl</span><T> FusedIterator <span class="kw">for </span>Drain<<span class="lifetime">'_</span>, T> {} |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="slab" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |