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class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">heapless/</div>vec.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"> <a href="#1" id="1">1</a> <a href="#2" id="2">2</a> <a href="#3" id="3">3</a> <a href="#4" id="4">4</a> <a href="#5" id="5">5</a> <a href="#6" id="6">6</a> <a href="#7" id="7">7</a> <a href="#8" id="8">8</a> <a href="#9" id="9">9</a> <a href="#10" id="10">10</a> <a href="#11" id="11">11</a> <a href="#12" id="12">12</a> <a href="#13" id="13">13</a> <a href="#14" id="14">14</a> <a href="#15" id="15">15</a> <a href="#16" id="16">16</a> <a href="#17" id="17">17</a> <a href="#18" id="18">18</a> <a href="#19" id="19">19</a> <a href="#20" id="20">20</a> <a href="#21" id="21">21</a> <a href="#22" id="22">22</a> <a href="#23" id="23">23</a> <a href="#24" id="24">24</a> <a href="#25" 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href="#963" id="963">963</a> <a href="#964" id="964">964</a> <a href="#965" id="965">965</a> <a href="#966" id="966">966</a> <a href="#967" id="967">967</a> <a href="#968" id="968">968</a> <a href="#969" id="969">969</a> <a href="#970" id="970">970</a> <a href="#971" id="971">971</a> <a href="#972" id="972">972</a> <a href="#973" id="973">973</a> <a href="#974" id="974">974</a> <a href="#975" id="975">975</a> <a href="#976" id="976">976</a> <a href="#977" id="977">977</a> <a href="#978" id="978">978</a> <a href="#979" id="979">979</a> <a href="#980" id="980">980</a> <a href="#981" id="981">981</a> <a href="#982" id="982">982</a> <a href="#983" id="983">983</a> <a href="#984" id="984">984</a> <a href="#985" id="985">985</a> <a href="#986" id="986">986</a> <a href="#987" id="987">987</a> <a href="#988" id="988">988</a> <a href="#989" id="989">989</a> <a href="#990" id="990">990</a> <a href="#991" id="991">991</a> <a href="#992" id="992">992</a> <a href="#993" id="993">993</a> <a href="#994" id="994">994</a> <a href="#995" id="995">995</a> <a href="#996" id="996">996</a> <a href="#997" id="997">997</a> <a href="#998" id="998">998</a> <a href="#999" id="999">999</a> <a href="#1000" id="1000">1000</a> <a href="#1001" id="1001">1001</a> <a href="#1002" id="1002">1002</a> <a href="#1003" id="1003">1003</a> <a href="#1004" id="1004">1004</a> <a href="#1005" id="1005">1005</a> <a href="#1006" id="1006">1006</a> <a href="#1007" id="1007">1007</a> <a href="#1008" id="1008">1008</a> <a href="#1009" id="1009">1009</a> <a href="#1010" id="1010">1010</a> <a href="#1011" id="1011">1011</a> <a href="#1012" id="1012">1012</a> <a href="#1013" id="1013">1013</a> <a href="#1014" id="1014">1014</a> <a href="#1015" id="1015">1015</a> <a href="#1016" id="1016">1016</a> <a href="#1017" id="1017">1017</a> <a href="#1018" id="1018">1018</a> <a href="#1019" id="1019">1019</a> <a href="#1020" id="1020">1020</a> <a href="#1021" id="1021">1021</a> <a href="#1022" id="1022">1022</a> <a href="#1023" id="1023">1023</a> <a href="#1024" id="1024">1024</a> <a href="#1025" id="1025">1025</a> <a href="#1026" id="1026">1026</a> <a href="#1027" id="1027">1027</a> <a href="#1028" id="1028">1028</a> <a href="#1029" id="1029">1029</a> <a href="#1030" id="1030">1030</a> <a href="#1031" id="1031">1031</a> <a href="#1032" id="1032">1032</a> <a href="#1033" id="1033">1033</a> <a href="#1034" id="1034">1034</a> <a href="#1035" id="1035">1035</a> <a href="#1036" id="1036">1036</a> <a href="#1037" id="1037">1037</a> <a href="#1038" id="1038">1038</a> <a href="#1039" id="1039">1039</a> <a href="#1040" id="1040">1040</a> <a href="#1041" id="1041">1041</a> <a href="#1042" id="1042">1042</a> <a href="#1043" id="1043">1043</a> <a href="#1044" id="1044">1044</a> <a href="#1045" id="1045">1045</a> <a href="#1046" id="1046">1046</a> <a href="#1047" id="1047">1047</a> <a href="#1048" id="1048">1048</a> <a href="#1049" id="1049">1049</a> <a href="#1050" id="1050">1050</a> <a href="#1051" id="1051">1051</a> <a href="#1052" id="1052">1052</a> <a href="#1053" id="1053">1053</a> <a href="#1054" id="1054">1054</a> <a href="#1055" id="1055">1055</a> <a href="#1056" id="1056">1056</a> <a href="#1057" id="1057">1057</a> <a href="#1058" id="1058">1058</a> <a href="#1059" id="1059">1059</a> <a href="#1060" id="1060">1060</a> <a href="#1061" id="1061">1061</a> <a href="#1062" id="1062">1062</a> <a href="#1063" id="1063">1063</a> <a href="#1064" id="1064">1064</a> <a href="#1065" id="1065">1065</a> <a href="#1066" id="1066">1066</a> <a href="#1067" id="1067">1067</a> <a href="#1068" id="1068">1068</a> <a href="#1069" id="1069">1069</a> <a href="#1070" id="1070">1070</a> <a href="#1071" id="1071">1071</a> <a href="#1072" id="1072">1072</a> <a href="#1073" id="1073">1073</a> <a href="#1074" id="1074">1074</a> <a href="#1075" id="1075">1075</a> <a href="#1076" id="1076">1076</a> <a href="#1077" id="1077">1077</a> <a href="#1078" id="1078">1078</a> <a href="#1079" id="1079">1079</a> <a href="#1080" id="1080">1080</a> <a href="#1081" id="1081">1081</a> <a href="#1082" id="1082">1082</a> <a href="#1083" id="1083">1083</a> <a href="#1084" id="1084">1084</a> <a href="#1085" id="1085">1085</a> <a href="#1086" id="1086">1086</a> <a href="#1087" id="1087">1087</a> <a href="#1088" id="1088">1088</a> <a href="#1089" id="1089">1089</a> <a href="#1090" id="1090">1090</a> <a href="#1091" id="1091">1091</a> <a href="#1092" id="1092">1092</a> <a href="#1093" id="1093">1093</a> <a href="#1094" id="1094">1094</a> <a href="#1095" id="1095">1095</a> <a href="#1096" id="1096">1096</a> <a href="#1097" id="1097">1097</a> <a href="#1098" id="1098">1098</a> <a href="#1099" id="1099">1099</a> <a href="#1100" id="1100">1100</a> <a href="#1101" id="1101">1101</a> <a href="#1102" id="1102">1102</a> <a href="#1103" id="1103">1103</a> <a href="#1104" id="1104">1104</a> <a href="#1105" id="1105">1105</a> <a href="#1106" id="1106">1106</a> <a href="#1107" id="1107">1107</a> <a href="#1108" id="1108">1108</a> <a href="#1109" id="1109">1109</a> <a href="#1110" id="1110">1110</a> <a href="#1111" id="1111">1111</a> <a href="#1112" id="1112">1112</a> <a href="#1113" id="1113">1113</a> <a href="#1114" id="1114">1114</a> <a href="#1115" id="1115">1115</a> <a href="#1116" id="1116">1116</a> <a href="#1117" id="1117">1117</a> <a href="#1118" id="1118">1118</a> <a href="#1119" id="1119">1119</a> <a href="#1120" id="1120">1120</a> <a href="#1121" id="1121">1121</a> <a href="#1122" id="1122">1122</a> <a href="#1123" id="1123">1123</a> <a href="#1124" id="1124">1124</a> <a href="#1125" id="1125">1125</a> <a href="#1126" id="1126">1126</a> <a href="#1127" id="1127">1127</a> <a href="#1128" id="1128">1128</a> <a href="#1129" id="1129">1129</a> <a href="#1130" id="1130">1130</a> <a href="#1131" id="1131">1131</a> <a href="#1132" id="1132">1132</a> <a href="#1133" id="1133">1133</a> <a href="#1134" id="1134">1134</a> <a href="#1135" id="1135">1135</a> <a href="#1136" id="1136">1136</a> <a href="#1137" id="1137">1137</a> <a href="#1138" id="1138">1138</a> <a href="#1139" id="1139">1139</a> <a href="#1140" id="1140">1140</a> <a href="#1141" id="1141">1141</a> <a href="#1142" id="1142">1142</a> <a href="#1143" id="1143">1143</a> <a href="#1144" id="1144">1144</a> <a href="#1145" id="1145">1145</a> <a href="#1146" id="1146">1146</a> <a href="#1147" id="1147">1147</a> <a href="#1148" id="1148">1148</a> <a href="#1149" id="1149">1149</a> <a href="#1150" id="1150">1150</a> <a href="#1151" id="1151">1151</a> <a href="#1152" id="1152">1152</a> <a href="#1153" id="1153">1153</a> <a href="#1154" id="1154">1154</a> <a href="#1155" id="1155">1155</a> <a href="#1156" id="1156">1156</a> <a href="#1157" id="1157">1157</a> <a href="#1158" id="1158">1158</a> <a href="#1159" id="1159">1159</a> <a href="#1160" id="1160">1160</a> <a href="#1161" id="1161">1161</a> <a href="#1162" id="1162">1162</a> <a href="#1163" id="1163">1163</a> <a href="#1164" id="1164">1164</a> <a href="#1165" id="1165">1165</a> <a href="#1166" id="1166">1166</a> <a href="#1167" id="1167">1167</a> <a href="#1168" id="1168">1168</a> <a href="#1169" id="1169">1169</a> <a href="#1170" id="1170">1170</a> <a href="#1171" id="1171">1171</a> <a href="#1172" id="1172">1172</a> <a href="#1173" id="1173">1173</a> <a href="#1174" id="1174">1174</a> <a href="#1175" id="1175">1175</a> <a href="#1176" id="1176">1176</a> <a href="#1177" id="1177">1177</a> <a href="#1178" id="1178">1178</a> <a href="#1179" id="1179">1179</a> <a href="#1180" id="1180">1180</a> <a href="#1181" id="1181">1181</a> <a href="#1182" id="1182">1182</a> <a href="#1183" id="1183">1183</a> <a href="#1184" id="1184">1184</a> <a href="#1185" id="1185">1185</a> <a href="#1186" id="1186">1186</a> <a href="#1187" id="1187">1187</a> <a href="#1188" id="1188">1188</a> <a href="#1189" id="1189">1189</a> <a href="#1190" id="1190">1190</a> <a href="#1191" id="1191">1191</a> <a href="#1192" id="1192">1192</a> <a href="#1193" id="1193">1193</a> <a href="#1194" id="1194">1194</a> <a href="#1195" id="1195">1195</a> <a href="#1196" id="1196">1196</a> <a href="#1197" id="1197">1197</a> <a href="#1198" id="1198">1198</a> <a href="#1199" id="1199">1199</a> <a href="#1200" id="1200">1200</a> <a href="#1201" id="1201">1201</a> <a href="#1202" id="1202">1202</a> <a href="#1203" id="1203">1203</a> <a href="#1204" id="1204">1204</a> <a href="#1205" id="1205">1205</a> <a href="#1206" id="1206">1206</a> <a href="#1207" id="1207">1207</a> <a href="#1208" id="1208">1208</a> <a href="#1209" id="1209">1209</a> <a href="#1210" id="1210">1210</a> <a href="#1211" id="1211">1211</a> <a href="#1212" id="1212">1212</a> <a href="#1213" id="1213">1213</a> <a href="#1214" id="1214">1214</a> <a href="#1215" id="1215">1215</a> <a href="#1216" id="1216">1216</a> <a href="#1217" id="1217">1217</a> <a href="#1218" id="1218">1218</a> <a href="#1219" id="1219">1219</a> <a href="#1220" id="1220">1220</a> <a href="#1221" id="1221">1221</a> <a href="#1222" id="1222">1222</a> <a href="#1223" id="1223">1223</a> <a href="#1224" id="1224">1224</a> <a href="#1225" id="1225">1225</a> <a href="#1226" id="1226">1226</a> <a href="#1227" id="1227">1227</a> <a href="#1228" id="1228">1228</a> <a href="#1229" id="1229">1229</a> <a href="#1230" id="1230">1230</a> <a href="#1231" id="1231">1231</a> <a href="#1232" id="1232">1232</a> <a href="#1233" id="1233">1233</a> <a href="#1234" id="1234">1234</a> <a href="#1235" id="1235">1235</a> <a href="#1236" id="1236">1236</a> <a href="#1237" id="1237">1237</a> <a href="#1238" id="1238">1238</a> <a href="#1239" id="1239">1239</a> <a href="#1240" id="1240">1240</a> <a href="#1241" id="1241">1241</a> <a href="#1242" id="1242">1242</a> <a href="#1243" id="1243">1243</a> <a href="#1244" id="1244">1244</a> <a href="#1245" id="1245">1245</a> <a href="#1246" id="1246">1246</a> <a href="#1247" id="1247">1247</a> <a href="#1248" id="1248">1248</a> <a href="#1249" id="1249">1249</a> <a href="#1250" id="1250">1250</a> <a href="#1251" id="1251">1251</a> <a href="#1252" id="1252">1252</a> <a href="#1253" id="1253">1253</a> <a href="#1254" id="1254">1254</a> <a href="#1255" id="1255">1255</a> <a href="#1256" id="1256">1256</a> <a href="#1257" id="1257">1257</a> <a href="#1258" id="1258">1258</a> <a href="#1259" id="1259">1259</a> <a href="#1260" id="1260">1260</a> <a href="#1261" id="1261">1261</a> <a href="#1262" id="1262">1262</a> <a href="#1263" id="1263">1263</a> <a href="#1264" id="1264">1264</a> <a href="#1265" id="1265">1265</a> <a href="#1266" id="1266">1266</a> <a href="#1267" id="1267">1267</a> <a href="#1268" id="1268">1268</a> <a href="#1269" id="1269">1269</a> <a href="#1270" id="1270">1270</a> <a href="#1271" id="1271">1271</a> <a href="#1272" id="1272">1272</a> <a href="#1273" id="1273">1273</a> <a href="#1274" id="1274">1274</a> <a href="#1275" id="1275">1275</a> <a href="#1276" id="1276">1276</a> <a href="#1277" id="1277">1277</a> <a href="#1278" id="1278">1278</a> <a href="#1279" id="1279">1279</a> <a href="#1280" id="1280">1280</a> <a href="#1281" id="1281">1281</a> <a href="#1282" id="1282">1282</a> <a href="#1283" id="1283">1283</a> <a href="#1284" id="1284">1284</a> <a href="#1285" id="1285">1285</a> <a href="#1286" id="1286">1286</a> <a href="#1287" id="1287">1287</a> <a href="#1288" id="1288">1288</a> <a href="#1289" id="1289">1289</a> <a href="#1290" id="1290">1290</a> <a href="#1291" id="1291">1291</a> <a href="#1292" id="1292">1292</a> <a href="#1293" id="1293">1293</a> <a href="#1294" id="1294">1294</a> <a href="#1295" id="1295">1295</a> <a href="#1296" id="1296">1296</a> <a href="#1297" id="1297">1297</a> <a href="#1298" id="1298">1298</a> <a href="#1299" id="1299">1299</a> <a href="#1300" id="1300">1300</a> <a href="#1301" id="1301">1301</a> <a href="#1302" id="1302">1302</a> <a href="#1303" id="1303">1303</a> <a href="#1304" id="1304">1304</a> <a href="#1305" id="1305">1305</a> <a href="#1306" id="1306">1306</a> <a href="#1307" id="1307">1307</a> 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id="1336">1336</a> <a href="#1337" id="1337">1337</a> <a href="#1338" id="1338">1338</a> <a href="#1339" id="1339">1339</a> <a href="#1340" id="1340">1340</a> <a href="#1341" id="1341">1341</a> <a href="#1342" id="1342">1342</a> <a href="#1343" id="1343">1343</a> <a href="#1344" id="1344">1344</a> <a href="#1345" id="1345">1345</a> <a href="#1346" id="1346">1346</a> <a href="#1347" id="1347">1347</a> <a href="#1348" id="1348">1348</a> <a href="#1349" id="1349">1349</a> <a href="#1350" id="1350">1350</a> <a href="#1351" id="1351">1351</a> <a href="#1352" id="1352">1352</a> <a href="#1353" id="1353">1353</a> <a href="#1354" id="1354">1354</a> <a href="#1355" id="1355">1355</a> <a href="#1356" id="1356">1356</a> <a href="#1357" id="1357">1357</a> <a href="#1358" id="1358">1358</a> <a href="#1359" id="1359">1359</a> <a href="#1360" id="1360">1360</a> <a href="#1361" id="1361">1361</a> <a href="#1362" id="1362">1362</a> <a href="#1363" id="1363">1363</a> <a href="#1364" id="1364">1364</a> 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id="1564">1564</a> <a href="#1565" id="1565">1565</a> <a href="#1566" id="1566">1566</a> <a href="#1567" id="1567">1567</a> <a href="#1568" id="1568">1568</a> <a href="#1569" id="1569">1569</a> <a href="#1570" id="1570">1570</a> <a href="#1571" id="1571">1571</a> <a href="#1572" id="1572">1572</a> <a href="#1573" id="1573">1573</a> <a href="#1574" id="1574">1574</a> <a href="#1575" id="1575">1575</a> <a href="#1576" id="1576">1576</a> <a href="#1577" id="1577">1577</a> <a href="#1578" id="1578">1578</a> <a href="#1579" id="1579">1579</a> <a href="#1580" id="1580">1580</a> <a href="#1581" id="1581">1581</a> <a href="#1582" id="1582">1582</a> <a href="#1583" id="1583">1583</a> <a href="#1584" id="1584">1584</a> <a href="#1585" id="1585">1585</a> <a href="#1586" id="1586">1586</a> <a href="#1587" id="1587">1587</a> <a href="#1588" id="1588">1588</a> <a href="#1589" id="1589">1589</a> <a href="#1590" id="1590">1590</a> <a href="#1591" id="1591">1591</a> <a href="#1592" id="1592">1592</a> <a href="#1593" id="1593">1593</a> <a href="#1594" id="1594">1594</a> <a href="#1595" id="1595">1595</a> <a href="#1596" id="1596">1596</a> <a href="#1597" id="1597">1597</a> <a href="#1598" id="1598">1598</a> <a href="#1599" id="1599">1599</a> <a href="#1600" id="1600">1600</a></pre></div><pre class="rust"><code><span class="kw">use </span>core::{ cmp::Ordering, convert::TryFrom, fmt, hash, iter::FromIterator, mem::MaybeUninit, ops, ptr, slice, }; <span class="kw">use </span>hash32; <span class="doccomment">/// A fixed capacity [`Vec`](https://doc.rust-lang.org/std/vec/struct.Vec.html) /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// /// // A vector with a fixed capacity of 8 elements allocated on the stack /// let mut vec = Vec::<_, 8>::new(); /// vec.push(1); /// vec.push(2); /// /// assert_eq!(vec.len(), 2); /// assert_eq!(vec[0], 1); /// /// assert_eq!(vec.pop(), Some(2)); /// assert_eq!(vec.len(), 1); /// /// vec[0] = 7; /// assert_eq!(vec[0], 7); /// /// vec.extend([1, 2, 3].iter().cloned()); /// /// for x in &vec { /// println!("{}", x); /// } /// assert_eq!(*vec, [7, 1, 2, 3]); /// ``` </span><span class="kw">pub struct </span>Vec<T, <span class="kw">const </span>N: usize> { <span class="comment">// NOTE order is important for optimizations. the `len` first layout lets the compiler optimize // `new` to: reserve stack space and zero the first word. With the fields in the reverse order // the compiler optimizes `new` to `memclr`-ing the *entire* stack space, including the `buffer` // field which should be left uninitialized. Optimizations were last checked with Rust 1.60 </span>len: usize, buffer: [MaybeUninit<T>; N], } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Vec<T, N> { <span class="kw">const </span>ELEM: MaybeUninit<T> = MaybeUninit::uninit(); <span class="kw">const </span>INIT: [MaybeUninit<T>; N] = [<span class="self">Self</span>::ELEM; N]; <span class="comment">// important for optimization of `new` </span><span class="doccomment">/// Constructs a new, empty vector with a fixed capacity of `N` /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// // allocate the vector on the stack /// let mut x: Vec<u8, 16> = Vec::new(); /// /// // allocate the vector in a static variable /// static mut X: Vec<u8, 16> = Vec::new(); /// ``` /// `Vec` `const` constructor; wrap the returned value in [`Vec`](../struct.Vec.html) </span><span class="kw">pub const fn </span>new() -> <span class="self">Self </span>{ <span class="comment">// Const assert N >= 0 </span><span class="kw">crate</span>::sealed::greater_than_eq_0::<N>(); <span class="self">Self </span>{ len: <span class="number">0</span>, buffer: <span class="self">Self</span>::INIT, } } <span class="doccomment">/// Constructs a new vector with a fixed capacity of `N` and fills it /// with the provided slice. /// /// This is equivalent to the following code: /// /// ``` /// use heapless::Vec; /// /// let mut v: Vec<u8, 16> = Vec::new(); /// v.extend_from_slice(&[1, 2, 3]).unwrap(); /// ``` </span><span class="attr">#[inline] </span><span class="kw">pub fn </span>from_slice(other: <span class="kw-2">&</span>[T]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, ()> <span class="kw">where </span>T: Clone, { <span class="kw">let </span><span class="kw-2">mut </span>v = Vec::new(); v.extend_from_slice(other)<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>(v) } <span class="doccomment">/// Clones a vec into a new vec </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span><span class="kw">where </span>T: Clone, { <span class="kw">let </span><span class="kw-2">mut </span>new = <span class="self">Self</span>::new(); <span class="comment">// avoid `extend_from_slice` as that introduces a runtime check / panicking branch </span><span class="kw">for </span>elem <span class="kw">in </span><span class="self">self </span>{ <span class="kw">unsafe </span>{ new.push_unchecked(elem.clone()); } } new } <span class="doccomment">/// Returns a raw pointer to the vector’s buffer. </span><span class="kw">pub fn </span>as_ptr(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">*const </span>T { <span class="self">self</span>.buffer.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T } <span class="doccomment">/// Returns a raw pointer to the vector’s buffer, which may be mutated through. </span><span class="kw">pub fn </span>as_mut_ptr(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">*mut </span>T { <span class="self">self</span>.buffer.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>T } <span class="doccomment">/// Extracts a slice containing the entire vector. /// /// Equivalent to `&s[..]`. /// /// # Examples /// /// ``` /// use heapless::Vec; /// let buffer: Vec<u8, 5> = Vec::from_slice(&[1, 2, 3, 5, 8]).unwrap(); /// assert_eq!(buffer.as_slice(), &[1, 2, 3, 5, 8]); /// ``` </span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] { <span class="comment">// NOTE(unsafe) avoid bound checks in the slicing operation // &buffer[..self.len] </span><span class="kw">unsafe </span>{ slice::from_raw_parts(<span class="self">self</span>.buffer.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T, <span class="self">self</span>.len) } } <span class="doccomment">/// Returns the contents of the vector as an array of length `M` if the length /// of the vector is exactly `M`, otherwise returns `Err(self)`. /// /// # Examples /// /// ``` /// use heapless::Vec; /// let buffer: Vec<u8, 42> = Vec::from_slice(&[1, 2, 3, 5, 8]).unwrap(); /// let array: [u8; 5] = buffer.into_array().unwrap(); /// assert_eq!(array, [1, 2, 3, 5, 8]); /// ``` </span><span class="kw">pub fn </span>into_array<<span class="kw">const </span>M: usize>(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><[T; M], <span class="self">Self</span>> { <span class="kw">if </span><span class="self">self</span>.len() == M { <span class="comment">// This is how the unstable `MaybeUninit::array_assume_init` method does it </span><span class="kw">let </span>array = <span class="kw">unsafe </span>{ (<span class="kw-2">&</span><span class="self">self</span>.buffer <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_ as </span><span class="kw-2">*const </span>[T; M]).read() }; <span class="comment">// We don't want `self`'s destructor to be called because that would drop all the // items in the array </span>core::mem::forget(<span class="self">self</span>); <span class="prelude-val">Ok</span>(array) } <span class="kw">else </span>{ <span class="prelude-val">Err</span>(<span class="self">self</span>) } } <span class="doccomment">/// Extracts a mutable slice containing the entire vector. /// /// Equivalent to `&s[..]`. /// /// # Examples /// /// ``` /// use heapless::Vec; /// let mut buffer: Vec<u8, 5> = Vec::from_slice(&[1, 2, 3, 5, 8]).unwrap(); /// buffer[0] = 9; /// assert_eq!(buffer.as_slice(), &[9, 2, 3, 5, 8]); /// ``` </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>as_mut_slice(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[T] { <span class="comment">// NOTE(unsafe) avoid bound checks in the slicing operation // &mut buffer[..self.len] </span><span class="kw">unsafe </span>{ slice::from_raw_parts_mut(<span class="self">self</span>.buffer.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>T, <span class="self">self</span>.len) } } <span class="doccomment">/// Returns the maximum number of elements the vector can hold. </span><span class="kw">pub const fn </span>capacity(<span class="kw-2">&</span><span class="self">self</span>) -> usize { N } <span class="doccomment">/// Clears the vector, removing all values. </span><span class="kw">pub fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { <span class="self">self</span>.truncate(<span class="number">0</span>); } <span class="doccomment">/// Extends the vec from an iterator. /// /// # Panic /// /// Panics if the vec cannot hold all elements of the iterator. </span><span class="kw">pub fn </span>extend<I>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: I) <span class="kw">where </span>I: IntoIterator<Item = T>, { <span class="kw">for </span>elem <span class="kw">in </span>iter { <span class="self">self</span>.push(elem).ok().unwrap() } } <span class="doccomment">/// Clones and appends all elements in a slice to the `Vec`. /// /// Iterates over the slice `other`, clones each element, and then appends /// it to this `Vec`. The `other` vector is traversed in-order. /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// let mut vec = Vec::<u8, 8>::new(); /// vec.push(1).unwrap(); /// vec.extend_from_slice(&[2, 3, 4]).unwrap(); /// assert_eq!(*vec, [1, 2, 3, 4]); /// ``` </span><span class="kw">pub fn </span>extend_from_slice(<span class="kw-2">&mut </span><span class="self">self</span>, other: <span class="kw-2">&</span>[T]) -> <span class="prelude-ty">Result</span><(), ()> <span class="kw">where </span>T: Clone, { <span class="kw">if </span><span class="self">self</span>.len + other.len() > <span class="self">self</span>.capacity() { <span class="comment">// won't fit in the `Vec`; don't modify anything and return an error </span><span class="prelude-val">Err</span>(()) } <span class="kw">else </span>{ <span class="kw">for </span>elem <span class="kw">in </span>other { <span class="kw">unsafe </span>{ <span class="self">self</span>.push_unchecked(elem.clone()); } } <span class="prelude-val">Ok</span>(()) } } <span class="doccomment">/// Removes the last element from a vector and returns it, or `None` if it's empty </span><span class="kw">pub fn </span>pop(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><T> { <span class="kw">if </span><span class="self">self</span>.len != <span class="number">0 </span>{ <span class="prelude-val">Some</span>(<span class="kw">unsafe </span>{ <span class="self">self</span>.pop_unchecked() }) } <span class="kw">else </span>{ <span class="prelude-val">None </span>} } <span class="doccomment">/// Appends an `item` to the back of the collection /// /// Returns back the `item` if the vector is full </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, item: T) -> <span class="prelude-ty">Result</span><(), T> { <span class="kw">if </span><span class="self">self</span>.len < <span class="self">self</span>.capacity() { <span class="kw">unsafe </span>{ <span class="self">self</span>.push_unchecked(item) } <span class="prelude-val">Ok</span>(()) } <span class="kw">else </span>{ <span class="prelude-val">Err</span>(item) } } <span class="doccomment">/// Removes the last element from a vector and returns it /// /// # Safety /// /// This assumes the vec to have at least one element. </span><span class="kw">pub unsafe fn </span>pop_unchecked(<span class="kw-2">&mut </span><span class="self">self</span>) -> T { <span class="macro">debug_assert!</span>(!<span class="self">self</span>.is_empty()); <span class="self">self</span>.len -= <span class="number">1</span>; (<span class="self">self</span>.buffer.get_unchecked_mut(<span class="self">self</span>.len).as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T).read() } <span class="doccomment">/// Appends an `item` to the back of the collection /// /// # Safety /// /// This assumes the vec is not full. </span><span class="kw">pub unsafe fn </span>push_unchecked(<span class="kw-2">&mut </span><span class="self">self</span>, item: T) { <span class="comment">// NOTE(ptr::write) the memory slot that we are about to write to is uninitialized. We // use `ptr::write` to avoid running `T`'s destructor on the uninitialized memory </span><span class="macro">debug_assert!</span>(!<span class="self">self</span>.is_full()); <span class="kw-2">*</span><span class="self">self</span>.buffer.get_unchecked_mut(<span class="self">self</span>.len) = MaybeUninit::new(item); <span class="self">self</span>.len += <span class="number">1</span>; } <span class="doccomment">/// Shortens the vector, keeping the first `len` elements and dropping the rest. </span><span class="kw">pub fn </span>truncate(<span class="kw-2">&mut </span><span class="self">self</span>, len: usize) { <span class="comment">// This is safe because: // // * the slice passed to `drop_in_place` is valid; the `len > self.len` // case avoids creating an invalid slice, and // * the `len` of the vector is shrunk before calling `drop_in_place`, // such that no value will be dropped twice in case `drop_in_place` // were to panic once (if it panics twice, the program aborts). </span><span class="kw">unsafe </span>{ <span class="comment">// Note: It's intentional that this is `>` and not `>=`. // Changing it to `>=` has negative performance // implications in some cases. See rust-lang/rust#78884 for more. </span><span class="kw">if </span>len > <span class="self">self</span>.len { <span class="kw">return</span>; } <span class="kw">let </span>remaining_len = <span class="self">self</span>.len - len; <span class="kw">let </span>s = ptr::slice_from_raw_parts_mut(<span class="self">self</span>.as_mut_ptr().add(len), remaining_len); <span class="self">self</span>.len = len; ptr::drop_in_place(s); } } <span class="doccomment">/// Resizes the Vec in-place so that len is equal to new_len. /// /// If new_len is greater than len, the Vec is extended by the /// difference, with each additional slot filled with value. If /// new_len is less than len, the Vec is simply truncated. /// /// See also [`resize_default`](struct.Vec.html#method.resize_default). </span><span class="kw">pub fn </span>resize(<span class="kw-2">&mut </span><span class="self">self</span>, new_len: usize, value: T) -> <span class="prelude-ty">Result</span><(), ()> <span class="kw">where </span>T: Clone, { <span class="kw">if </span>new_len > <span class="self">self</span>.capacity() { <span class="kw">return </span><span class="prelude-val">Err</span>(()); } <span class="kw">if </span>new_len > <span class="self">self</span>.len { <span class="kw">while </span><span class="self">self</span>.len < new_len { <span class="self">self</span>.push(value.clone()).ok(); } } <span class="kw">else </span>{ <span class="self">self</span>.truncate(new_len); } <span class="prelude-val">Ok</span>(()) } <span class="doccomment">/// Resizes the `Vec` in-place so that `len` is equal to `new_len`. /// /// If `new_len` is greater than `len`, the `Vec` is extended by the /// difference, with each additional slot filled with `Default::default()`. /// If `new_len` is less than `len`, the `Vec` is simply truncated. /// /// See also [`resize`](struct.Vec.html#method.resize). </span><span class="kw">pub fn </span>resize_default(<span class="kw-2">&mut </span><span class="self">self</span>, new_len: usize) -> <span class="prelude-ty">Result</span><(), ()> <span class="kw">where </span>T: Clone + Default, { <span class="self">self</span>.resize(new_len, T::default()) } <span class="doccomment">/// Forces the length of the vector to `new_len`. /// /// This is a low-level operation that maintains none of the normal /// invariants of the type. Normally changing the length of a vector /// is done using one of the safe operations instead, such as /// [`truncate`], [`resize`], [`extend`], or [`clear`]. /// /// [`truncate`]: #method.truncate /// [`resize`]: #method.resize /// [`extend`]: https://doc.rust-lang.org/stable/core/iter/trait.Extend.html#tymethod.extend /// [`clear`]: #method.clear /// /// # Safety /// /// - `new_len` must be less than or equal to [`capacity()`]. /// - The elements at `old_len..new_len` must be initialized. /// /// [`capacity()`]: #method.capacity /// /// # Examples /// /// This method can be useful for situations in which the vector /// is serving as a buffer for other code, particularly over FFI: /// /// ```no_run /// # #![allow(dead_code)] /// use heapless::Vec; /// /// # // This is just a minimal skeleton for the doc example; /// # // don't use this as a starting point for a real library. /// # pub struct StreamWrapper { strm: *mut core::ffi::c_void } /// # const Z_OK: i32 = 0; /// # extern "C" { /// # fn deflateGetDictionary( /// # strm: *mut core::ffi::c_void, /// # dictionary: *mut u8, /// # dictLength: *mut usize, /// # ) -> i32; /// # } /// # impl StreamWrapper { /// pub fn get_dictionary(&self) -> Option<Vec<u8, 32768>> { /// // Per the FFI method's docs, "32768 bytes is always enough". /// let mut dict = Vec::new(); /// let mut dict_length = 0; /// // SAFETY: When `deflateGetDictionary` returns `Z_OK`, it holds that: /// // 1. `dict_length` elements were initialized. /// // 2. `dict_length` <= the capacity (32_768) /// // which makes `set_len` safe to call. /// unsafe { /// // Make the FFI call... /// let r = deflateGetDictionary(self.strm, dict.as_mut_ptr(), &mut dict_length); /// if r == Z_OK { /// // ...and update the length to what was initialized. /// dict.set_len(dict_length); /// Some(dict) /// } else { /// None /// } /// } /// } /// # } /// ``` /// /// While the following example is sound, there is a memory leak since /// the inner vectors were not freed prior to the `set_len` call: /// /// ``` /// use core::iter::FromIterator; /// use heapless::Vec; /// /// let mut vec = Vec::<Vec<u8, 3>, 3>::from_iter( /// [ /// Vec::from_iter([1, 0, 0].iter().cloned()), /// Vec::from_iter([0, 1, 0].iter().cloned()), /// Vec::from_iter([0, 0, 1].iter().cloned()), /// ] /// .iter() /// .cloned() /// ); /// // SAFETY: /// // 1. `old_len..0` is empty so no elements need to be initialized. /// // 2. `0 <= capacity` always holds whatever `capacity` is. /// unsafe { /// vec.set_len(0); /// } /// ``` /// /// Normally, here, one would use [`clear`] instead to correctly drop /// the contents and thus not leak memory. </span><span class="kw">pub unsafe fn </span>set_len(<span class="kw-2">&mut </span><span class="self">self</span>, new_len: usize) { <span class="macro">debug_assert!</span>(new_len <= <span class="self">self</span>.capacity()); <span class="self">self</span>.len = new_len } <span class="doccomment">/// Removes an element from the vector and returns it. /// /// The removed element is replaced by the last element of the vector. /// /// This does not preserve ordering, but is O(1). /// /// # Panics /// /// Panics if `index` is out of bounds. /// /// # Examples /// /// ``` /// use heapless::Vec; </span><span class="comment">///// use heapless::consts::*; </span><span class="doccomment">/// /// let mut v: Vec<_, 8> = Vec::new(); /// v.push("foo").unwrap(); /// v.push("bar").unwrap(); /// v.push("baz").unwrap(); /// v.push("qux").unwrap(); /// /// assert_eq!(v.swap_remove(1), "bar"); /// assert_eq!(&*v, ["foo", "qux", "baz"]); /// /// assert_eq!(v.swap_remove(0), "foo"); /// assert_eq!(&*v, ["baz", "qux"]); /// ``` </span><span class="kw">pub fn </span>swap_remove(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize) -> T { <span class="macro">assert!</span>(index < <span class="self">self</span>.len); <span class="kw">unsafe </span>{ <span class="self">self</span>.swap_remove_unchecked(index) } } <span class="doccomment">/// Removes an element from the vector and returns it. /// /// The removed element is replaced by the last element of the vector. /// /// This does not preserve ordering, but is O(1). /// /// # Safety /// /// Assumes `index` within bounds. /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// let mut v: Vec<_, 8> = Vec::new(); /// v.push("foo").unwrap(); /// v.push("bar").unwrap(); /// v.push("baz").unwrap(); /// v.push("qux").unwrap(); /// /// assert_eq!(unsafe { v.swap_remove_unchecked(1) }, "bar"); /// assert_eq!(&*v, ["foo", "qux", "baz"]); /// /// assert_eq!(unsafe { v.swap_remove_unchecked(0) }, "foo"); /// assert_eq!(&*v, ["baz", "qux"]); /// ``` </span><span class="kw">pub unsafe fn </span>swap_remove_unchecked(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize) -> T { <span class="kw">let </span>length = <span class="self">self</span>.len(); <span class="macro">debug_assert!</span>(index < length); <span class="kw">let </span>value = ptr::read(<span class="self">self</span>.as_ptr().add(index)); <span class="kw">let </span>base_ptr = <span class="self">self</span>.as_mut_ptr(); ptr::copy(base_ptr.add(length - <span class="number">1</span>), base_ptr.add(index), <span class="number">1</span>); <span class="self">self</span>.len -= <span class="number">1</span>; value } <span class="doccomment">/// Returns true if the vec is full </span><span class="attr">#[inline] </span><span class="kw">pub fn </span>is_full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { <span class="self">self</span>.len == <span class="self">self</span>.capacity() } <span class="doccomment">/// Returns true if the vec is empty </span><span class="attr">#[inline] </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">/// Returns `true` if `needle` is a prefix of the Vec. /// /// Always returns `true` if `needle` is an empty slice. /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// let v: Vec<_, 8> = Vec::from_slice(b"abc").unwrap(); /// assert_eq!(v.starts_with(b""), true); /// assert_eq!(v.starts_with(b"ab"), true); /// assert_eq!(v.starts_with(b"bc"), false); /// ``` </span><span class="attr">#[inline] </span><span class="kw">pub fn </span>starts_with(<span class="kw-2">&</span><span class="self">self</span>, needle: <span class="kw-2">&</span>[T]) -> bool <span class="kw">where </span>T: PartialEq, { <span class="kw">let </span>n = needle.len(); <span class="self">self</span>.len >= n && needle == <span class="kw-2">&</span><span class="self">self</span>[..n] } <span class="doccomment">/// Returns `true` if `needle` is a suffix of the Vec. /// /// Always returns `true` if `needle` is an empty slice. /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// let v: Vec<_, 8> = Vec::from_slice(b"abc").unwrap(); /// assert_eq!(v.ends_with(b""), true); /// assert_eq!(v.ends_with(b"ab"), false); /// assert_eq!(v.ends_with(b"bc"), true); /// ``` </span><span class="attr">#[inline] </span><span class="kw">pub fn </span>ends_with(<span class="kw-2">&</span><span class="self">self</span>, needle: <span class="kw-2">&</span>[T]) -> bool <span class="kw">where </span>T: PartialEq, { <span class="kw">let </span>(v, n) = (<span class="self">self</span>.len(), needle.len()); v >= n && needle == <span class="kw-2">&</span><span class="self">self</span>[v - n..] } <span class="doccomment">/// Inserts an element at position `index` within the vector, shifting all /// elements after it to the right. /// /// Returns back the `element` if the vector is full. /// /// # Panics /// /// Panics if `index > len`. /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// let mut vec: Vec<_, 8> = Vec::from_slice(&[1, 2, 3]).unwrap(); /// vec.insert(1, 4); /// assert_eq!(vec, [1, 4, 2, 3]); /// vec.insert(4, 5); /// assert_eq!(vec, [1, 4, 2, 3, 5]); /// ``` </span><span class="kw">pub fn </span>insert(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize, element: T) -> <span class="prelude-ty">Result</span><(), T> { <span class="kw">let </span>len = <span class="self">self</span>.len(); <span class="kw">if </span>index > len { <span class="macro">panic!</span>( <span class="string">"insertion index (is {}) should be <= len (is {})"</span>, index, len ); } <span class="comment">// check there's space for the new element </span><span class="kw">if </span><span class="self">self</span>.is_full() { <span class="kw">return </span><span class="prelude-val">Err</span>(element); } <span class="kw">unsafe </span>{ <span class="comment">// infallible // The spot to put the new value </span>{ <span class="kw">let </span>p = <span class="self">self</span>.as_mut_ptr().add(index); <span class="comment">// Shift everything over to make space. (Duplicating the // `index`th element into two consecutive places.) </span>ptr::copy(p, p.offset(<span class="number">1</span>), len - index); <span class="comment">// Write it in, overwriting the first copy of the `index`th // element. </span>ptr::write(p, element); } <span class="self">self</span>.set_len(len + <span class="number">1</span>); } <span class="prelude-val">Ok</span>(()) } <span class="doccomment">/// Removes and returns the element at position `index` within the vector, /// shifting all elements after it to the left. /// /// Note: Because this shifts over the remaining elements, it has a /// worst-case performance of *O*(*n*). If you don't need the order of /// elements to be preserved, use [`swap_remove`] instead. If you'd like to /// remove elements from the beginning of the `Vec`, consider using /// [`Deque::pop_front`] instead. /// /// [`swap_remove`]: Vec::swap_remove /// [`Deque::pop_front`]: crate::Deque::pop_front /// /// # Panics /// /// Panics if `index` is out of bounds. /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// let mut v: Vec<_, 8> = Vec::from_slice(&[1, 2, 3]).unwrap(); /// assert_eq!(v.remove(1), 2); /// assert_eq!(v, [1, 3]); /// ``` </span><span class="kw">pub fn </span>remove(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize) -> T { <span class="kw">let </span>len = <span class="self">self</span>.len(); <span class="kw">if </span>index >= len { <span class="macro">panic!</span>(<span class="string">"removal index (is {}) should be < len (is {})"</span>, index, len); } <span class="kw">unsafe </span>{ <span class="comment">// infallible </span><span class="kw">let </span>ret; { <span class="comment">// the place we are taking from. </span><span class="kw">let </span>ptr = <span class="self">self</span>.as_mut_ptr().add(index); <span class="comment">// copy it out, unsafely having a copy of the value on // the stack and in the vector at the same time. </span>ret = ptr::read(ptr); <span class="comment">// Shift everything down to fill in that spot. </span>ptr::copy(ptr.offset(<span class="number">1</span>), ptr, len - index - <span class="number">1</span>); } <span class="self">self</span>.set_len(len - <span class="number">1</span>); ret } } <span class="doccomment">/// Retains only the elements specified by the predicate. /// /// In other words, remove all elements `e` for which `f(&e)` returns `false`. /// This method operates in place, visiting each element exactly once in the /// original order, and preserves the order of the retained elements. /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// let mut vec: Vec<_, 8> = Vec::from_slice(&[1, 2, 3, 4]).unwrap(); /// vec.retain(|&x| x % 2 == 0); /// assert_eq!(vec, [2, 4]); /// ``` /// /// Because the elements are visited exactly once in the original order, /// external state may be used to decide which elements to keep. /// /// ``` /// use heapless::Vec; /// /// let mut vec: Vec<_, 8> = Vec::from_slice(&[1, 2, 3, 4, 5]).unwrap(); /// let keep = [false, true, true, false, true]; /// let mut iter = keep.iter(); /// vec.retain(|_| *iter.next().unwrap()); /// assert_eq!(vec, [2, 3, 5]); /// ``` </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(<span class="kw-2">&</span>T) -> bool, { <span class="self">self</span>.retain_mut(|elem| f(elem)); } <span class="doccomment">/// Retains only the elements specified by the predicate, passing a mutable reference to it. /// /// In other words, remove all elements `e` such that `f(&mut e)` returns `false`. /// This method operates in place, visiting each element exactly once in the /// original order, and preserves the order of the retained elements. /// /// # Examples /// /// ``` /// use heapless::Vec; /// /// let mut vec: Vec<_, 8> = Vec::from_slice(&[1, 2, 3, 4]).unwrap(); /// vec.retain_mut(|x| if *x <= 3 { /// *x += 1; /// true /// } else { /// false /// }); /// assert_eq!(vec, [2, 3, 4]); /// ``` </span><span class="kw">pub fn </span>retain_mut<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(<span class="kw-2">&mut </span>T) -> bool, { <span class="kw">let </span>original_len = <span class="self">self</span>.len(); <span class="comment">// Avoid double drop if the drop guard is not executed, // since we may make some holes during the process. </span><span class="kw">unsafe </span>{ <span class="self">self</span>.set_len(<span class="number">0</span>) }; <span class="comment">// Vec: [Kept, Kept, Hole, Hole, Hole, Hole, Unchecked, Unchecked] // |<- processed len ->| ^- next to check // |<- deleted cnt ->| // |<- original_len ->| // Kept: Elements which predicate returns true on. // Hole: Moved or dropped element slot. // Unchecked: Unchecked valid elements. // // This drop guard will be invoked when predicate or `drop` of element panicked. // It shifts unchecked elements to cover holes and `set_len` to the correct length. // In cases when predicate and `drop` never panick, it will be optimized out. </span><span class="kw">struct </span>BackshiftOnDrop<<span class="lifetime">'a</span>, T, <span class="kw">const </span>N: usize> { v: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Vec<T, N>, processed_len: usize, deleted_cnt: usize, original_len: usize, } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Drop <span class="kw">for </span>BackshiftOnDrop<<span class="lifetime">'_</span>, T, N> { <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>.deleted_cnt > <span class="number">0 </span>{ <span class="comment">// SAFETY: Trailing unchecked items must be valid since we never touch them. </span><span class="kw">unsafe </span>{ ptr::copy( <span class="self">self</span>.v.as_ptr().add(<span class="self">self</span>.processed_len), <span class="self">self</span>.v .as_mut_ptr() .add(<span class="self">self</span>.processed_len - <span class="self">self</span>.deleted_cnt), <span class="self">self</span>.original_len - <span class="self">self</span>.processed_len, ); } } <span class="comment">// SAFETY: After filling holes, all items are in contiguous memory. </span><span class="kw">unsafe </span>{ <span class="self">self</span>.v.set_len(<span class="self">self</span>.original_len - <span class="self">self</span>.deleted_cnt); } } } <span class="kw">let </span><span class="kw-2">mut </span>g = BackshiftOnDrop { v: <span class="self">self</span>, processed_len: <span class="number">0</span>, deleted_cnt: <span class="number">0</span>, original_len, }; <span class="kw">fn </span>process_loop<F, T, <span class="kw">const </span>N: usize, <span class="kw">const </span>DELETED: bool>( original_len: usize, f: <span class="kw-2">&mut </span>F, g: <span class="kw-2">&mut </span>BackshiftOnDrop<<span class="lifetime">'_</span>, T, N>, ) <span class="kw">where </span>F: FnMut(<span class="kw-2">&mut </span>T) -> bool, { <span class="kw">while </span>g.processed_len != original_len { <span class="kw">let </span>p = g.v.as_mut_ptr(); <span class="comment">// SAFETY: Unchecked element must be valid. </span><span class="kw">let </span>cur = <span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span>p.add(g.processed_len) }; <span class="kw">if </span>!f(cur) { <span class="comment">// Advance early to avoid double drop if `drop_in_place` panicked. </span>g.processed_len += <span class="number">1</span>; g.deleted_cnt += <span class="number">1</span>; <span class="comment">// SAFETY: We never touch this element again after dropped. </span><span class="kw">unsafe </span>{ ptr::drop_in_place(cur) }; <span class="comment">// We already advanced the counter. </span><span class="kw">if </span>DELETED { <span class="kw">continue</span>; } <span class="kw">else </span>{ <span class="kw">break</span>; } } <span class="kw">if </span>DELETED { <span class="comment">// SAFETY: `deleted_cnt` > 0, so the hole slot must not overlap with current element. // We use copy for move, and never touch this element again. </span><span class="kw">unsafe </span>{ <span class="kw">let </span>hole_slot = p.add(g.processed_len - g.deleted_cnt); ptr::copy_nonoverlapping(cur, hole_slot, <span class="number">1</span>); } } g.processed_len += <span class="number">1</span>; } } <span class="comment">// Stage 1: Nothing was deleted. </span>process_loop::<F, T, N, <span class="bool-val">false</span>>(original_len, <span class="kw-2">&mut </span>f, <span class="kw-2">&mut </span>g); <span class="comment">// Stage 2: Some elements were deleted. </span>process_loop::<F, T, N, <span class="bool-val">true</span>>(original_len, <span class="kw-2">&mut </span>f, <span class="kw-2">&mut </span>g); <span class="comment">// All item are processed. This can be optimized to `set_len` by LLVM. </span>drop(g); } } <span class="comment">// Trait implementations </span><span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Default <span class="kw">for </span>Vec<T, N> { <span class="kw">fn </span>default() -> <span class="self">Self </span>{ <span class="self">Self</span>::new() } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> fmt::Debug <span class="kw">for </span>Vec<T, N> <span class="kw">where </span>T: fmt::Debug, { <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { <[T] <span class="kw">as </span>fmt::Debug>::fmt(<span class="self">self</span>, f) } } <span class="kw">impl</span><<span class="kw">const </span>N: usize> fmt::Write <span class="kw">for </span>Vec<u8, N> { <span class="kw">fn </span>write_str(<span class="kw-2">&mut </span><span class="self">self</span>, s: <span class="kw-2">&</span>str) -> fmt::Result { <span class="kw">match </span><span class="self">self</span>.extend_from_slice(s.as_bytes()) { <span class="prelude-val">Ok</span>(()) => <span class="prelude-val">Ok</span>(()), <span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(fmt::Error), } } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Drop <span class="kw">for </span>Vec<T, N> { <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { <span class="comment">// We drop each element used in the vector by turning into a &mut[T] </span><span class="kw">unsafe </span>{ ptr::drop_in_place(<span class="self">self</span>.as_mut_slice()); } } } <span class="kw">impl</span><<span class="lifetime">'a</span>, T: Clone, <span class="kw">const </span>N: usize> TryFrom<<span class="kw-2">&</span><span class="lifetime">'a </span>[T]> <span class="kw">for </span>Vec<T, N> { <span class="kw">type </span>Error = (); <span class="kw">fn </span>try_from(slice: <span class="kw-2">&</span><span class="lifetime">'a </span>[T]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Error> { Vec::from_slice(slice) } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Extend<T> <span class="kw">for </span>Vec<T, N> { <span class="kw">fn </span>extend<I>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: I) <span class="kw">where </span>I: IntoIterator<Item = T>, { <span class="self">self</span>.extend(iter) } } <span class="kw">impl</span><<span class="lifetime">'a</span>, T, <span class="kw">const </span>N: usize> Extend<<span class="kw-2">&</span><span class="lifetime">'a </span>T> <span class="kw">for </span>Vec<T, N> <span class="kw">where </span>T: <span class="lifetime">'a </span>+ Copy, { <span class="kw">fn </span>extend<I>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: I) <span class="kw">where </span>I: IntoIterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T>, { <span class="self">self</span>.extend(iter.into_iter().cloned()) } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> hash::Hash <span class="kw">for </span>Vec<T, N> <span class="kw">where </span>T: core::hash::Hash, { <span class="kw">fn </span>hash<H: hash::Hasher>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) { <[T] <span class="kw">as </span>hash::Hash>::hash(<span class="self">self</span>, state) } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> hash32::Hash <span class="kw">for </span>Vec<T, N> <span class="kw">where </span>T: hash32::Hash, { <span class="kw">fn </span>hash<H: hash32::Hasher>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) { <[T] <span class="kw">as </span>hash32::Hash>::hash(<span class="self">self</span>, state) } } <span class="kw">impl</span><<span class="lifetime">'a</span>, T, <span class="kw">const </span>N: usize> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>Vec<T, N> { <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T; <span class="kw">type </span>IntoIter = slice::Iter<<span class="lifetime">'a</span>, T>; <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { <span class="self">self</span>.iter() } } <span class="kw">impl</span><<span class="lifetime">'a</span>, T, <span class="kw">const </span>N: usize> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Vec<T, N> { <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T; <span class="kw">type </span>IntoIter = slice::IterMut<<span class="lifetime">'a</span>, T>; <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { <span class="self">self</span>.iter_mut() } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> FromIterator<T> <span class="kw">for </span>Vec<T, N> { <span class="kw">fn </span>from_iter<I>(iter: I) -> <span class="self">Self </span><span class="kw">where </span>I: IntoIterator<Item = T>, { <span class="kw">let </span><span class="kw-2">mut </span>vec = Vec::new(); <span class="kw">for </span>i <span class="kw">in </span>iter { vec.push(i).ok().expect(<span class="string">"Vec::from_iter overflow"</span>); } vec } } <span class="doccomment">/// An iterator that moves out of an [`Vec`][`Vec`]. /// /// This struct is created by calling the `into_iter` method on [`Vec`][`Vec`]. /// /// [`Vec`]: (https://doc.rust-lang.org/std/vec/struct.Vec.html) /// </span><span class="kw">pub struct </span>IntoIter<T, <span class="kw">const </span>N: usize> { vec: Vec<T, N>, next: usize, } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Iterator <span class="kw">for </span>IntoIter<T, N> { <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">if </span><span class="self">self</span>.next < <span class="self">self</span>.vec.len() { <span class="kw">let </span>item = <span class="kw">unsafe </span>{ (<span class="self">self</span>.vec.buffer.get_unchecked_mut(<span class="self">self</span>.next).as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T).read() }; <span class="self">self</span>.next += <span class="number">1</span>; <span class="prelude-val">Some</span>(item) } <span class="kw">else </span>{ <span class="prelude-val">None </span>} } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Clone <span class="kw">for </span>IntoIter<T, N> <span class="kw">where </span>T: Clone, { <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ <span class="kw">let </span><span class="kw-2">mut </span>vec = Vec::new(); <span class="kw">if </span><span class="self">self</span>.next < <span class="self">self</span>.vec.len() { <span class="kw">let </span>s = <span class="kw">unsafe </span>{ slice::from_raw_parts( (<span class="self">self</span>.vec.buffer.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T).add(<span class="self">self</span>.next), <span class="self">self</span>.vec.len() - <span class="self">self</span>.next, ) }; vec.extend_from_slice(s).ok(); } <span class="self">Self </span>{ vec, next: <span class="number">0 </span>} } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Drop <span class="kw">for </span>IntoIter<T, N> { <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { <span class="kw">unsafe </span>{ <span class="comment">// Drop all the elements that have not been moved out of vec </span>ptr::drop_in_place(<span class="kw-2">&mut </span><span class="self">self</span>.vec.as_mut_slice()[<span class="self">self</span>.next..]); <span class="comment">// Prevent dropping of other elements </span><span class="self">self</span>.vec.len = <span class="number">0</span>; } } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> IntoIterator <span class="kw">for </span>Vec<T, N> { <span class="kw">type </span>Item = T; <span class="kw">type </span>IntoIter = IntoIter<T, N>; <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { IntoIter { vec: <span class="self">self</span>, next: <span class="number">0 </span>} } } <span class="kw">impl</span><A, B, <span class="kw">const </span>N1: usize, <span class="kw">const </span>N2: usize> PartialEq<Vec<B, N2>> <span class="kw">for </span>Vec<A, N1> <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Vec<B, N2>) -> bool { <[A]>::eq(<span class="self">self</span>, <span class="kw-2">&**</span>other) } } <span class="comment">// Vec<A, N> == [B] </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize> PartialEq<[B]> <span class="kw">for </span>Vec<A, N> <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>[B]) -> bool { <[A]>::eq(<span class="self">self</span>, <span class="kw-2">&</span>other[..]) } } <span class="comment">// [B] == Vec<A, N> </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize> PartialEq<Vec<A, N>> <span class="kw">for </span>[B] <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Vec<A, N>) -> bool { <[A]>::eq(other, <span class="kw-2">&</span><span class="self">self</span>[..]) } } <span class="comment">// Vec<A, N> == &[B] </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize> PartialEq<<span class="kw-2">&</span>[B]> <span class="kw">for </span>Vec<A, N> <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: &&[B]) -> bool { <[A]>::eq(<span class="self">self</span>, <span class="kw-2">&</span>other[..]) } } <span class="comment">// &[B] == Vec<A, N> </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize> PartialEq<Vec<A, N>> <span class="kw">for </span><span class="kw-2">&</span>[B] <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Vec<A, N>) -> bool { <[A]>::eq(other, <span class="kw-2">&</span><span class="self">self</span>[..]) } } <span class="comment">// Vec<A, N> == &mut [B] </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize> PartialEq<<span class="kw-2">&mut </span>[B]> <span class="kw">for </span>Vec<A, N> <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: &&<span class="kw-2">mut </span>[B]) -> bool { <[A]>::eq(<span class="self">self</span>, <span class="kw-2">&</span>other[..]) } } <span class="comment">// &mut [B] == Vec<A, N> </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize> PartialEq<Vec<A, N>> <span class="kw">for </span><span class="kw-2">&mut </span>[B] <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Vec<A, N>) -> bool { <[A]>::eq(other, <span class="kw-2">&</span><span class="self">self</span>[..]) } } <span class="comment">// Vec<A, N> == [B; M] // Equality does not require equal capacity </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize, <span class="kw">const </span>M: usize> PartialEq<[B; M]> <span class="kw">for </span>Vec<A, N> <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>[B; M]) -> bool { <[A]>::eq(<span class="self">self</span>, <span class="kw-2">&</span>other[..]) } } <span class="comment">// [B; M] == Vec<A, N> // Equality does not require equal capacity </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize, <span class="kw">const </span>M: usize> PartialEq<Vec<A, N>> <span class="kw">for </span>[B; M] <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Vec<A, N>) -> bool { <[A]>::eq(other, <span class="kw-2">&</span><span class="self">self</span>[..]) } } <span class="comment">// Vec<A, N> == &[B; M] // Equality does not require equal capacity </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize, <span class="kw">const </span>M: usize> PartialEq<<span class="kw-2">&</span>[B; M]> <span class="kw">for </span>Vec<A, N> <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: &&[B; M]) -> bool { <[A]>::eq(<span class="self">self</span>, <span class="kw-2">&</span>other[..]) } } <span class="comment">// &[B; M] == Vec<A, N> // Equality does not require equal capacity </span><span class="kw">impl</span><A, B, <span class="kw">const </span>N: usize, <span class="kw">const </span>M: usize> PartialEq<Vec<A, N>> <span class="kw">for </span><span class="kw-2">&</span>[B; M] <span class="kw">where </span>A: PartialEq<B>, { <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Vec<A, N>) -> bool { <[A]>::eq(other, <span class="kw-2">&</span><span class="self">self</span>[..]) } } <span class="comment">// Implements Eq if underlying data is Eq </span><span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Eq <span class="kw">for </span>Vec<T, N> <span class="kw">where </span>T: Eq {} <span class="kw">impl</span><T, <span class="kw">const </span>N1: usize, <span class="kw">const </span>N2: usize> PartialOrd<Vec<T, N2>> <span class="kw">for </span>Vec<T, N1> <span class="kw">where </span>T: PartialOrd, { <span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Vec<T, N2>) -> <span class="prelude-ty">Option</span><Ordering> { PartialOrd::partial_cmp(<span class="kw-2">&**</span><span class="self">self</span>, <span class="kw-2">&**</span>other) } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Ord <span class="kw">for </span>Vec<T, N> <span class="kw">where </span>T: Ord, { <span class="attr">#[inline] </span><span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> Ordering { Ord::cmp(<span class="kw-2">&**</span><span class="self">self</span>, <span class="kw-2">&**</span>other) } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> ops::Deref <span class="kw">for </span>Vec<T, N> { <span class="kw">type </span>Target = [T]; <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] { <span class="self">self</span>.as_slice() } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> ops::DerefMut <span class="kw">for </span>Vec<T, N> { <span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[T] { <span class="self">self</span>.as_mut_slice() } } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> AsRef<Vec<T, N>> <span class="kw">for </span>Vec<T, N> { <span class="attr">#[inline] </span><span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self </span>{ <span class="self">self </span>} } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> AsMut<Vec<T, N>> <span class="kw">for </span>Vec<T, N> { <span class="attr">#[inline] </span><span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self </span>{ <span class="self">self </span>} } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> AsRef<[T]> <span class="kw">for </span>Vec<T, N> { <span class="attr">#[inline] </span><span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[T] { <span class="self">self </span>} } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> AsMut<[T]> <span class="kw">for </span>Vec<T, N> { <span class="attr">#[inline] </span><span class="kw">fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>[T] { <span class="self">self </span>} } <span class="kw">impl</span><T, <span class="kw">const </span>N: usize> Clone <span class="kw">for </span>Vec<T, N> <span class="kw">where </span>T: Clone, { <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>.clone() } } <span class="attr">#[cfg(test)] </span><span class="kw">mod </span>tests { <span class="kw">use </span><span class="kw">crate</span>::Vec; <span class="kw">use </span>core::fmt::Write; <span class="attr">#[test] </span><span class="kw">fn </span>static_new() { <span class="kw">static </span><span class="kw-2">mut </span>_V: Vec<i32, <span class="number">4</span>> = Vec::new(); } <span class="attr">#[test] </span><span class="kw">fn </span>stack_new() { <span class="kw">let </span><span class="kw-2">mut </span>_v: Vec<i32, <span class="number">4</span>> = Vec::new(); } <span class="attr">#[test] </span><span class="kw">fn </span>is_full_empty() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<i32, <span class="number">4</span>> = Vec::new(); <span class="macro">assert!</span>(v.is_empty()); <span class="macro">assert!</span>(!v.is_full()); v.push(<span class="number">1</span>).unwrap(); <span class="macro">assert!</span>(!v.is_empty()); <span class="macro">assert!</span>(!v.is_full()); v.push(<span class="number">1</span>).unwrap(); <span class="macro">assert!</span>(!v.is_empty()); <span class="macro">assert!</span>(!v.is_full()); v.push(<span class="number">1</span>).unwrap(); <span class="macro">assert!</span>(!v.is_empty()); <span class="macro">assert!</span>(!v.is_full()); v.push(<span class="number">1</span>).unwrap(); <span class="macro">assert!</span>(!v.is_empty()); <span class="macro">assert!</span>(v.is_full()); } <span class="attr">#[test] </span><span class="kw">fn </span>drop() { <span class="macro">droppable!</span>(); { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<Droppable, <span class="number">2</span>> = Vec::new(); v.push(Droppable::new()).ok().unwrap(); v.push(Droppable::new()).ok().unwrap(); v.pop().unwrap(); } <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>); { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<Droppable, <span class="number">2</span>> = Vec::new(); v.push(Droppable::new()).ok().unwrap(); v.push(Droppable::new()).ok().unwrap(); } <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>eq() { <span class="kw">let </span><span class="kw-2">mut </span>xs: Vec<i32, <span class="number">4</span>> = Vec::new(); <span class="kw">let </span><span class="kw-2">mut </span>ys: Vec<i32, <span class="number">8</span>> = Vec::new(); <span class="macro">assert_eq!</span>(xs, ys); xs.push(<span class="number">1</span>).unwrap(); ys.push(<span class="number">1</span>).unwrap(); <span class="macro">assert_eq!</span>(xs, ys); } <span class="attr">#[test] </span><span class="kw">fn </span>cmp() { <span class="kw">let </span><span class="kw-2">mut </span>xs: Vec<i32, <span class="number">4</span>> = Vec::new(); <span class="kw">let </span><span class="kw-2">mut </span>ys: Vec<i32, <span class="number">4</span>> = Vec::new(); <span class="macro">assert_eq!</span>(xs, ys); xs.push(<span class="number">1</span>).unwrap(); ys.push(<span class="number">2</span>).unwrap(); <span class="macro">assert!</span>(xs < ys); } <span class="attr">#[test] </span><span class="kw">fn </span>cmp_heterogenous_size() { <span class="kw">let </span><span class="kw-2">mut </span>xs: Vec<i32, <span class="number">4</span>> = Vec::new(); <span class="kw">let </span><span class="kw-2">mut </span>ys: Vec<i32, <span class="number">8</span>> = Vec::new(); <span class="macro">assert_eq!</span>(xs, ys); xs.push(<span class="number">1</span>).unwrap(); ys.push(<span class="number">2</span>).unwrap(); <span class="macro">assert!</span>(xs < ys); } <span class="attr">#[test] </span><span class="kw">fn </span>cmp_with_arrays_and_slices() { <span class="kw">let </span><span class="kw-2">mut </span>xs: Vec<i32, <span class="number">12</span>> = Vec::new(); xs.push(<span class="number">1</span>).unwrap(); <span class="kw">let </span>array = [<span class="number">1</span>]; <span class="macro">assert_eq!</span>(xs, array); <span class="macro">assert_eq!</span>(array, xs); <span class="macro">assert_eq!</span>(xs, array.as_slice()); <span class="macro">assert_eq!</span>(array.as_slice(), xs); <span class="macro">assert_eq!</span>(xs, <span class="kw-2">&</span>array); <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>array, xs); <span class="kw">let </span>longer_array = [<span class="number">1</span>; <span class="number">20</span>]; <span class="macro">assert_ne!</span>(xs, longer_array); <span class="macro">assert_ne!</span>(longer_array, xs); } <span class="attr">#[test] </span><span class="kw">fn </span>full() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<i32, <span class="number">4</span>> = Vec::new(); v.push(<span class="number">0</span>).unwrap(); v.push(<span class="number">1</span>).unwrap(); v.push(<span class="number">2</span>).unwrap(); v.push(<span class="number">3</span>).unwrap(); <span class="macro">assert!</span>(v.push(<span class="number">4</span>).is_err()); } <span class="attr">#[test] </span><span class="kw">fn </span>iter() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<i32, <span class="number">4</span>> = Vec::new(); v.push(<span class="number">0</span>).unwrap(); v.push(<span class="number">1</span>).unwrap(); v.push(<span class="number">2</span>).unwrap(); v.push(<span class="number">3</span>).unwrap(); <span class="kw">let </span><span class="kw-2">mut </span>items = v.iter(); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">0</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">3</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">None</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>iter_mut() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<i32, <span class="number">4</span>> = Vec::new(); v.push(<span class="number">0</span>).unwrap(); v.push(<span class="number">1</span>).unwrap(); v.push(<span class="number">2</span>).unwrap(); v.push(<span class="number">3</span>).unwrap(); <span class="kw">let </span><span class="kw-2">mut </span>items = v.iter_mut(); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">0</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">1</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">2</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">3</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">None</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>collect_from_iter() { <span class="kw">let </span>slice = <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]; <span class="kw">let </span>vec: Vec<i32, <span class="number">4</span>> = slice.iter().cloned().collect(); <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>vec, slice); } <span class="attr">#[test] #[should_panic] </span><span class="kw">fn </span>collect_from_iter_overfull() { <span class="kw">let </span>slice = <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]; <span class="kw">let </span>_vec = slice.iter().cloned().collect::<Vec<<span class="kw">_</span>, <span class="number">2</span>>>(); } <span class="attr">#[test] </span><span class="kw">fn </span>iter_move() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<i32, <span class="number">4</span>> = Vec::new(); v.push(<span class="number">0</span>).unwrap(); v.push(<span class="number">1</span>).unwrap(); v.push(<span class="number">2</span>).unwrap(); v.push(<span class="number">3</span>).unwrap(); <span class="kw">let </span><span class="kw-2">mut </span>items = v.into_iter(); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="number">0</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="number">1</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="number">2</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="number">3</span>)); <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">None</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>iter_move_drop() { <span class="macro">droppable!</span>(); { <span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<Droppable, <span class="number">2</span>> = Vec::new(); vec.push(Droppable::new()).ok().unwrap(); vec.push(Droppable::new()).ok().unwrap(); <span class="kw">let </span><span class="kw-2">mut </span>items = vec.into_iter(); <span class="comment">// Move all </span><span class="kw">let _ </span>= items.next(); <span class="kw">let _ </span>= items.next(); } <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>); { <span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<Droppable, <span class="number">2</span>> = Vec::new(); vec.push(Droppable::new()).ok().unwrap(); vec.push(Droppable::new()).ok().unwrap(); <span class="kw">let </span>_items = vec.into_iter(); <span class="comment">// Move none </span>} <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>); { <span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<Droppable, <span class="number">2</span>> = Vec::new(); vec.push(Droppable::new()).ok().unwrap(); vec.push(Droppable::new()).ok().unwrap(); <span class="kw">let </span><span class="kw-2">mut </span>items = vec.into_iter(); <span class="kw">let _ </span>= items.next(); <span class="comment">// Move partly </span>} <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>push_and_pop() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<i32, <span class="number">4</span>> = Vec::new(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); <span class="macro">assert_eq!</span>(v.pop(), <span class="prelude-val">None</span>); <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); v.push(<span class="number">0</span>).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">1</span>); <span class="macro">assert_eq!</span>(v.pop(), <span class="prelude-val">Some</span>(<span class="number">0</span>)); <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); <span class="macro">assert_eq!</span>(v.pop(), <span class="prelude-val">None</span>); <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>resize_size_limit() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<u8, <span class="number">4</span>> = Vec::new(); v.resize(<span class="number">0</span>, <span class="number">0</span>).unwrap(); v.resize(<span class="number">4</span>, <span class="number">0</span>).unwrap(); v.resize(<span class="number">5</span>, <span class="number">0</span>).err().expect(<span class="string">"full"</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>resize_length_cases() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<u8, <span class="number">4</span>> = Vec::new(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); <span class="comment">// Grow by 1 </span>v.resize(<span class="number">1</span>, <span class="number">0</span>).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">1</span>); <span class="comment">// Grow by 2 </span>v.resize(<span class="number">3</span>, <span class="number">0</span>).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>); <span class="comment">// Resize to current size </span>v.resize(<span class="number">3</span>, <span class="number">0</span>).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>); <span class="comment">// Shrink by 1 </span>v.resize(<span class="number">2</span>, <span class="number">0</span>).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">2</span>); <span class="comment">// Shrink by 2 </span>v.resize(<span class="number">0</span>, <span class="number">0</span>).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>resize_contents() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<u8, <span class="number">4</span>> = Vec::new(); <span class="comment">// New entries take supplied value when growing </span>v.resize(<span class="number">1</span>, <span class="number">17</span>).unwrap(); <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">17</span>); <span class="comment">// Old values aren't changed when growing </span>v.resize(<span class="number">2</span>, <span class="number">18</span>).unwrap(); <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">17</span>); <span class="macro">assert_eq!</span>(v[<span class="number">1</span>], <span class="number">18</span>); <span class="comment">// Old values aren't changed when length unchanged </span>v.resize(<span class="number">2</span>, <span class="number">0</span>).unwrap(); <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">17</span>); <span class="macro">assert_eq!</span>(v[<span class="number">1</span>], <span class="number">18</span>); <span class="comment">// Old values aren't changed when shrinking </span>v.resize(<span class="number">1</span>, <span class="number">0</span>).unwrap(); <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">17</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>resize_default() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<u8, <span class="number">4</span>> = Vec::new(); <span class="comment">// resize_default is implemented using resize, so just check the // correct value is being written. </span>v.resize_default(<span class="number">1</span>).unwrap(); <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">0</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>write() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<u8, <span class="number">4</span>> = Vec::new(); <span class="macro">write!</span>(v, <span class="string">"{:x}"</span>, <span class="number">1234</span>).unwrap(); <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>v[..], <span class="string">b"4d2"</span>); } <span class="attr">#[test] </span><span class="kw">fn </span>extend_from_slice() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<u8, <span class="number">4</span>> = Vec::new(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); v.extend_from_slice(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>]).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">2</span>); <span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>]); v.extend_from_slice(<span class="kw-2">&</span>[<span class="number">3</span>]).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>); <span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]); <span class="macro">assert!</span>(v.extend_from_slice(<span class="kw-2">&</span>[<span class="number">4</span>, <span class="number">5</span>]).is_err()); <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>); <span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]); } <span class="attr">#[test] </span><span class="kw">fn </span>from_slice() { <span class="comment">// Successful construction </span><span class="kw">let </span>v: Vec<u8, <span class="number">4</span>> = Vec::from_slice(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]).unwrap(); <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>); <span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]); <span class="comment">// Slice too large </span><span class="macro">assert!</span>(Vec::<u8, <span class="number">2</span>>::from_slice(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]).is_err()); } <span class="attr">#[test] </span><span class="kw">fn </span>starts_with() { <span class="kw">let </span>v: Vec<<span class="kw">_</span>, <span class="number">8</span>> = Vec::from_slice(<span class="string">b"ab"</span>).unwrap(); <span class="macro">assert!</span>(v.starts_with(<span class="kw-2">&</span>[])); <span class="macro">assert!</span>(v.starts_with(<span class="string">b""</span>)); <span class="macro">assert!</span>(v.starts_with(<span class="string">b"a"</span>)); <span class="macro">assert!</span>(v.starts_with(<span class="string">b"ab"</span>)); <span class="macro">assert!</span>(!v.starts_with(<span class="string">b"abc"</span>)); <span class="macro">assert!</span>(!v.starts_with(<span class="string">b"ba"</span>)); <span class="macro">assert!</span>(!v.starts_with(<span class="string">b"b"</span>)); } <span class="attr">#[test] </span><span class="kw">fn </span>ends_with() { <span class="kw">let </span>v: Vec<<span class="kw">_</span>, <span class="number">8</span>> = Vec::from_slice(<span class="string">b"ab"</span>).unwrap(); <span class="macro">assert!</span>(v.ends_with(<span class="kw-2">&</span>[])); <span class="macro">assert!</span>(v.ends_with(<span class="string">b""</span>)); <span class="macro">assert!</span>(v.ends_with(<span class="string">b"b"</span>)); <span class="macro">assert!</span>(v.ends_with(<span class="string">b"ab"</span>)); <span class="macro">assert!</span>(!v.ends_with(<span class="string">b"abc"</span>)); <span class="macro">assert!</span>(!v.ends_with(<span class="string">b"ba"</span>)); <span class="macro">assert!</span>(!v.ends_with(<span class="string">b"a"</span>)); } <span class="attr">#[test] </span><span class="kw">fn </span>zero_capacity() { <span class="kw">let </span><span class="kw-2">mut </span>v: Vec<u8, <span class="number">0</span>> = Vec::new(); <span class="comment">// Validate capacity </span><span class="macro">assert_eq!</span>(v.capacity(), <span class="number">0</span>); <span class="comment">// Make sure there is no capacity </span><span class="macro">assert!</span>(v.push(<span class="number">1</span>).is_err()); <span class="comment">// Validate length </span><span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); <span class="comment">// Validate pop </span><span class="macro">assert_eq!</span>(v.pop(), <span class="prelude-val">None</span>); <span class="comment">// Validate slice </span><span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&</span>[]); <span class="comment">// Validate empty </span><span class="macro">assert!</span>(v.is_empty()); <span class="comment">// Validate full </span><span class="macro">assert!</span>(v.is_full()); } } </code></pre></div></section></main></body></html>