| <!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/git/checkouts/rayon-3b3b152053499ede/a07ce2e/src/vec.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>vec.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="../../rayon/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="../../rayon/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> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! Parallel iterator types for [vectors][std::vec] (`Vec<T>`) |
| //! |
| //! You will rarely need to interact with this module directly unless you need |
| //! to name one of the iterator types. |
| //! |
| //! [std::vec]: https://doc.rust-lang.org/stable/std/vec/ |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::iter::plumbing::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::iter::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::math::simplify_range; |
| <span class="kw">use </span><span class="kw">crate</span>::slice::{Iter, IterMut}; |
| <span class="kw">use </span>std::iter; |
| <span class="kw">use </span>std::mem; |
| <span class="kw">use </span>std::ops::{Range, RangeBounds}; |
| <span class="kw">use </span>std::ptr; |
| <span class="kw">use </span>std::slice; |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: Sync + <span class="lifetime">'data</span>> IntoParallelIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'data </span>Vec<T> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'data </span>T; |
| <span class="kw">type </span>Iter = Iter<<span class="lifetime">'data</span>, T>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| <<span class="kw-2">&</span>[T]>::into_par_iter(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: Send + <span class="lifetime">'data</span>> IntoParallelIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'data </span><span class="kw-2">mut </span>Vec<T> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'data </span><span class="kw-2">mut </span>T; |
| <span class="kw">type </span>Iter = IterMut<<span class="lifetime">'data</span>, T>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| <<span class="kw-2">&mut </span>[T]>::into_par_iter(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Parallel iterator that moves out of a vector. |
| </span><span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>IntoIter<T: Send> { |
| vec: Vec<T>, |
| } |
| |
| <span class="kw">impl</span><T: Send> IntoParallelIterator <span class="kw">for </span>Vec<T> { |
| <span class="kw">type </span>Item = T; |
| <span class="kw">type </span>Iter = IntoIter<T>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| IntoIter { vec: <span class="self">self </span>} |
| } |
| } |
| |
| <span class="kw">impl</span><T: Send> ParallelIterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">type </span>Item = T; |
| |
| <span class="kw">fn </span>drive_unindexed<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="self">Self</span>::Item>, |
| { |
| bridge(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="kw">fn </span>opt_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.len()) |
| } |
| } |
| |
| <span class="kw">impl</span><T: Send> IndexedParallelIterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">fn </span>drive<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="self">Self</span>::Item>, |
| { |
| bridge(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.vec.len() |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(<span class="kw-2">mut </span><span class="self">self</span>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="self">Self</span>::Item>, |
| { |
| <span class="comment">// Drain every item, and then the vector only needs to free its buffer. |
| </span><span class="self">self</span>.vec.par_drain(..).with_producer(callback) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: Send> ParallelDrainRange<usize> <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'data </span><span class="kw-2">mut </span>Vec<T> { |
| <span class="kw">type </span>Iter = Drain<<span class="lifetime">'data</span>, T>; |
| <span class="kw">type </span>Item = T; |
| |
| <span class="kw">fn </span>par_drain<R: RangeBounds<usize>>(<span class="self">self</span>, range: R) -> <span class="self">Self</span>::Iter { |
| Drain { |
| orig_len: <span class="self">self</span>.len(), |
| range: simplify_range(range, <span class="self">self</span>.len()), |
| vec: <span class="self">self</span>, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Draining parallel iterator that moves a range out of a vector, but keeps the total capacity. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Drain<<span class="lifetime">'data</span>, T: Send> { |
| vec: <span class="kw-2">&</span><span class="lifetime">'data </span><span class="kw-2">mut </span>Vec<T>, |
| range: Range<usize>, |
| orig_len: usize, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: Send> ParallelIterator <span class="kw">for </span>Drain<<span class="lifetime">'data</span>, T> { |
| <span class="kw">type </span>Item = T; |
| |
| <span class="kw">fn </span>drive_unindexed<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="self">Self</span>::Item>, |
| { |
| bridge(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="kw">fn </span>opt_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.len()) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: Send> IndexedParallelIterator <span class="kw">for </span>Drain<<span class="lifetime">'data</span>, T> { |
| <span class="kw">fn </span>drive<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="self">Self</span>::Item>, |
| { |
| bridge(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.range.len() |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(<span class="self">self</span>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">unsafe </span>{ |
| <span class="comment">// Make the vector forget about the drained items, and temporarily the tail too. |
| </span><span class="self">self</span>.vec.set_len(<span class="self">self</span>.range.start); |
| |
| <span class="comment">// Create the producer as the exclusive "owner" of the slice. |
| </span><span class="kw">let </span>producer = DrainProducer::from_vec(<span class="self">self</span>.vec, <span class="self">self</span>.range.len()); |
| |
| <span class="comment">// The producer will move or drop each item from the drained range. |
| </span>callback.callback(producer) |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: Send> Drop <span class="kw">for </span>Drain<<span class="lifetime">'data</span>, T> { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">let </span>Range { start, end } = <span class="self">self</span>.range; |
| <span class="kw">if </span><span class="self">self</span>.vec.len() == <span class="self">self</span>.orig_len { |
| <span class="comment">// We must not have produced, so just call a normal drain to remove the items. |
| </span><span class="self">self</span>.vec.drain(start..end); |
| } <span class="kw">else if </span>start == end { |
| <span class="comment">// Empty range, so just restore the length to its original state |
| </span><span class="kw">unsafe </span>{ |
| <span class="self">self</span>.vec.set_len(<span class="self">self</span>.orig_len); |
| } |
| } <span class="kw">else if </span>end < <span class="self">self</span>.orig_len { |
| <span class="comment">// The producer was responsible for consuming the drained items. |
| // Move the tail items to their new place, then set the length to include them. |
| </span><span class="kw">unsafe </span>{ |
| <span class="kw">let </span>ptr = <span class="self">self</span>.vec.as_mut_ptr().add(start); |
| <span class="kw">let </span>tail_ptr = <span class="self">self</span>.vec.as_ptr().add(end); |
| <span class="kw">let </span>tail_len = <span class="self">self</span>.orig_len - end; |
| ptr::copy(tail_ptr, ptr, tail_len); |
| <span class="self">self</span>.vec.set_len(start + tail_len); |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// //////////////////////////////////////////////////////////////////////// |
| |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>DrainProducer<<span class="lifetime">'data</span>, T: Send> { |
| slice: <span class="kw-2">&</span><span class="lifetime">'data </span><span class="kw-2">mut </span>[T], |
| } |
| |
| <span class="kw">impl</span><T: Send> DrainProducer<<span class="lifetime">'_</span>, T> { |
| <span class="doccomment">/// Creates a draining producer, which *moves* items from the slice. |
| /// |
| /// Unsafe because `!Copy` data must not be read after the borrow is released. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">unsafe fn </span>new(slice: <span class="kw-2">&mut </span>[T]) -> DrainProducer<<span class="lifetime">'_</span>, T> { |
| DrainProducer { slice } |
| } |
| |
| <span class="doccomment">/// Creates a draining producer, which *moves* items from the tail of the vector. |
| /// |
| /// Unsafe because we're moving from beyond `vec.len()`, so the caller must ensure |
| /// that data is initialized and not read after the borrow is released. |
| </span><span class="kw">unsafe fn </span>from_vec(vec: <span class="kw-2">&mut </span>Vec<T>, len: usize) -> DrainProducer<<span class="lifetime">'_</span>, T> { |
| <span class="kw">let </span>start = vec.len(); |
| <span class="macro">assert!</span>(vec.capacity() - start >= len); |
| |
| <span class="comment">// The pointer is derived from `Vec` directly, not through a `Deref`, |
| // so it has provenance over the whole allocation. |
| </span><span class="kw">let </span>ptr = vec.as_mut_ptr().add(start); |
| DrainProducer::new(slice::from_raw_parts_mut(ptr, len)) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: <span class="lifetime">'data </span>+ Send> Producer <span class="kw">for </span>DrainProducer<<span class="lifetime">'data</span>, T> { |
| <span class="kw">type </span>Item = T; |
| <span class="kw">type </span>IntoIter = SliceDrain<<span class="lifetime">'data</span>, T>; |
| |
| <span class="kw">fn </span>into_iter(<span class="kw-2">mut </span><span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="comment">// replace the slice so we don't drop it twice |
| </span><span class="kw">let </span>slice = mem::take(<span class="kw-2">&mut </span><span class="self">self</span>.slice); |
| SliceDrain { |
| iter: slice.iter_mut(), |
| } |
| } |
| |
| <span class="kw">fn </span>split_at(<span class="kw-2">mut </span><span class="self">self</span>, index: usize) -> (<span class="self">Self</span>, <span class="self">Self</span>) { |
| <span class="comment">// replace the slice so we don't drop it twice |
| </span><span class="kw">let </span>slice = mem::take(<span class="kw-2">&mut </span><span class="self">self</span>.slice); |
| <span class="kw">let </span>(left, right) = slice.split_at_mut(index); |
| <span class="kw">unsafe </span>{ (DrainProducer::new(left), DrainProducer::new(right)) } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: <span class="lifetime">'data </span>+ Send> Drop <span class="kw">for </span>DrainProducer<<span class="lifetime">'data</span>, T> { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// extract the slice so we can use `Drop for [T]` |
| </span><span class="kw">let </span>slice_ptr: <span class="kw-2">*mut </span>[T] = mem::take::<<span class="kw-2">&</span><span class="lifetime">'data </span><span class="kw-2">mut </span>[T]>(<span class="kw-2">&mut </span><span class="self">self</span>.slice); |
| <span class="kw">unsafe </span>{ ptr::drop_in_place::<[T]>(slice_ptr) }; |
| } |
| } |
| |
| <span class="doccomment">/// //////////////////////////////////////////////////////////////////////// |
| |
| </span><span class="comment">// like std::vec::Drain, without updating a source Vec |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>SliceDrain<<span class="lifetime">'data</span>, T> { |
| iter: slice::IterMut<<span class="lifetime">'data</span>, T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: <span class="lifetime">'data</span>> Iterator <span class="kw">for </span>SliceDrain<<span class="lifetime">'data</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><T> { |
| <span class="comment">// Coerce the pointer early, so we don't keep the |
| // reference that's about to be invalidated. |
| </span><span class="kw">let </span>ptr: <span class="kw-2">*const </span>T = <span class="self">self</span>.iter.next()<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>(<span class="kw">unsafe </span>{ ptr::read(ptr) }) |
| } |
| |
| <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>.iter.size_hint() |
| } |
| |
| <span class="kw">fn </span>count(<span class="self">self</span>) -> usize { |
| <span class="self">self</span>.iter.len() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: <span class="lifetime">'data</span>> DoubleEndedIterator <span class="kw">for </span>SliceDrain<<span class="lifetime">'data</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="comment">// Coerce the pointer early, so we don't keep the |
| // reference that's about to be invalidated. |
| </span><span class="kw">let </span>ptr: <span class="kw-2">*const </span>T = <span class="self">self</span>.iter.next_back()<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>(<span class="kw">unsafe </span>{ ptr::read(ptr) }) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: <span class="lifetime">'data</span>> ExactSizeIterator <span class="kw">for </span>SliceDrain<<span class="lifetime">'data</span>, T> { |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.iter.len() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: <span class="lifetime">'data</span>> iter::FusedIterator <span class="kw">for </span>SliceDrain<<span class="lifetime">'data</span>, T> {} |
| |
| <span class="kw">impl</span><<span class="lifetime">'data</span>, T: <span class="lifetime">'data</span>> Drop <span class="kw">for </span>SliceDrain<<span class="lifetime">'data</span>, T> { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// extract the iterator so we can use `Drop for [T]` |
| </span><span class="kw">let </span>slice_ptr: <span class="kw-2">*mut </span>[T] = mem::replace(<span class="kw-2">&mut </span><span class="self">self</span>.iter, [].iter_mut()).into_slice(); |
| <span class="kw">unsafe </span>{ ptr::drop_in_place::<[T]>(slice_ptr) }; |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rayon" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
