| <!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/iter/unzip.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>unzip.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> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| <span id="324">324</span> |
| <span id="325">325</span> |
| <span id="326">326</span> |
| <span id="327">327</span> |
| <span id="328">328</span> |
| <span id="329">329</span> |
| <span id="330">330</span> |
| <span id="331">331</span> |
| <span id="332">332</span> |
| <span id="333">333</span> |
| <span id="334">334</span> |
| <span id="335">335</span> |
| <span id="336">336</span> |
| <span id="337">337</span> |
| <span id="338">338</span> |
| <span id="339">339</span> |
| <span id="340">340</span> |
| <span id="341">341</span> |
| <span id="342">342</span> |
| <span id="343">343</span> |
| <span id="344">344</span> |
| <span id="345">345</span> |
| <span id="346">346</span> |
| <span id="347">347</span> |
| <span id="348">348</span> |
| <span id="349">349</span> |
| <span id="350">350</span> |
| <span id="351">351</span> |
| <span id="352">352</span> |
| <span id="353">353</span> |
| <span id="354">354</span> |
| <span id="355">355</span> |
| <span id="356">356</span> |
| <span id="357">357</span> |
| <span id="358">358</span> |
| <span id="359">359</span> |
| <span id="360">360</span> |
| <span id="361">361</span> |
| <span id="362">362</span> |
| <span id="363">363</span> |
| <span id="364">364</span> |
| <span id="365">365</span> |
| <span id="366">366</span> |
| <span id="367">367</span> |
| <span id="368">368</span> |
| <span id="369">369</span> |
| <span id="370">370</span> |
| <span id="371">371</span> |
| <span id="372">372</span> |
| <span id="373">373</span> |
| <span id="374">374</span> |
| <span id="375">375</span> |
| <span id="376">376</span> |
| <span id="377">377</span> |
| <span id="378">378</span> |
| <span id="379">379</span> |
| <span id="380">380</span> |
| <span id="381">381</span> |
| <span id="382">382</span> |
| <span id="383">383</span> |
| <span id="384">384</span> |
| <span id="385">385</span> |
| <span id="386">386</span> |
| <span id="387">387</span> |
| <span id="388">388</span> |
| <span id="389">389</span> |
| <span id="390">390</span> |
| <span id="391">391</span> |
| <span id="392">392</span> |
| <span id="393">393</span> |
| <span id="394">394</span> |
| <span id="395">395</span> |
| <span id="396">396</span> |
| <span id="397">397</span> |
| <span id="398">398</span> |
| <span id="399">399</span> |
| <span id="400">400</span> |
| <span id="401">401</span> |
| <span id="402">402</span> |
| <span id="403">403</span> |
| <span id="404">404</span> |
| <span id="405">405</span> |
| <span id="406">406</span> |
| <span id="407">407</span> |
| <span id="408">408</span> |
| <span id="409">409</span> |
| <span id="410">410</span> |
| <span id="411">411</span> |
| <span id="412">412</span> |
| <span id="413">413</span> |
| <span id="414">414</span> |
| <span id="415">415</span> |
| <span id="416">416</span> |
| <span id="417">417</span> |
| <span id="418">418</span> |
| <span id="419">419</span> |
| <span id="420">420</span> |
| <span id="421">421</span> |
| <span id="422">422</span> |
| <span id="423">423</span> |
| <span id="424">424</span> |
| <span id="425">425</span> |
| <span id="426">426</span> |
| <span id="427">427</span> |
| <span id="428">428</span> |
| <span id="429">429</span> |
| <span id="430">430</span> |
| <span id="431">431</span> |
| <span id="432">432</span> |
| <span id="433">433</span> |
| <span id="434">434</span> |
| <span id="435">435</span> |
| <span id="436">436</span> |
| <span id="437">437</span> |
| <span id="438">438</span> |
| <span id="439">439</span> |
| <span id="440">440</span> |
| <span id="441">441</span> |
| <span id="442">442</span> |
| <span id="443">443</span> |
| <span id="444">444</span> |
| <span id="445">445</span> |
| <span id="446">446</span> |
| <span id="447">447</span> |
| <span id="448">448</span> |
| <span id="449">449</span> |
| <span id="450">450</span> |
| <span id="451">451</span> |
| <span id="452">452</span> |
| <span id="453">453</span> |
| <span id="454">454</span> |
| <span id="455">455</span> |
| <span id="456">456</span> |
| <span id="457">457</span> |
| <span id="458">458</span> |
| <span id="459">459</span> |
| <span id="460">460</span> |
| <span id="461">461</span> |
| <span id="462">462</span> |
| <span id="463">463</span> |
| <span id="464">464</span> |
| <span id="465">465</span> |
| <span id="466">466</span> |
| <span id="467">467</span> |
| <span id="468">468</span> |
| <span id="469">469</span> |
| <span id="470">470</span> |
| <span id="471">471</span> |
| <span id="472">472</span> |
| <span id="473">473</span> |
| <span id="474">474</span> |
| <span id="475">475</span> |
| <span id="476">476</span> |
| <span id="477">477</span> |
| <span id="478">478</span> |
| <span id="479">479</span> |
| <span id="480">480</span> |
| <span id="481">481</span> |
| <span id="482">482</span> |
| <span id="483">483</span> |
| <span id="484">484</span> |
| <span id="485">485</span> |
| <span id="486">486</span> |
| <span id="487">487</span> |
| <span id="488">488</span> |
| <span id="489">489</span> |
| <span id="490">490</span> |
| <span id="491">491</span> |
| <span id="492">492</span> |
| <span id="493">493</span> |
| <span id="494">494</span> |
| <span id="495">495</span> |
| <span id="496">496</span> |
| <span id="497">497</span> |
| <span id="498">498</span> |
| <span id="499">499</span> |
| <span id="500">500</span> |
| <span id="501">501</span> |
| <span id="502">502</span> |
| <span id="503">503</span> |
| <span id="504">504</span> |
| <span id="505">505</span> |
| <span id="506">506</span> |
| <span id="507">507</span> |
| <span id="508">508</span> |
| <span id="509">509</span> |
| <span id="510">510</span> |
| <span id="511">511</span> |
| <span id="512">512</span> |
| <span id="513">513</span> |
| <span id="514">514</span> |
| <span id="515">515</span> |
| <span id="516">516</span> |
| <span id="517">517</span> |
| <span id="518">518</span> |
| <span id="519">519</span> |
| <span id="520">520</span> |
| <span id="521">521</span> |
| <span id="522">522</span> |
| <span id="523">523</span> |
| <span id="524">524</span> |
| <span id="525">525</span> |
| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::plumbing::<span class="kw-2">*</span>; |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// This trait abstracts the different ways we can "unzip" one parallel |
| /// iterator into two distinct consumers, which we can handle almost |
| /// identically apart from how to process the individual items. |
| </span><span class="kw">trait </span>UnzipOp<T>: Sync + Send { |
| <span class="doccomment">/// The type of item expected by the left consumer. |
| </span><span class="kw">type </span>Left: Send; |
| |
| <span class="doccomment">/// The type of item expected by the right consumer. |
| </span><span class="kw">type </span>Right: Send; |
| |
| <span class="doccomment">/// Consumes one item and feeds it to one or both of the underlying folders. |
| </span><span class="kw">fn </span>consume<FA, FB>(<span class="kw-2">&</span><span class="self">self</span>, item: T, left: FA, right: FB) -> (FA, FB) |
| <span class="kw">where |
| </span>FA: Folder<<span class="self">Self</span>::Left>, |
| FB: Folder<<span class="self">Self</span>::Right>; |
| |
| <span class="doccomment">/// Reports whether this op may support indexed consumers. |
| /// - e.g. true for `unzip` where the item count passed through directly. |
| /// - e.g. false for `partition` where the sorting is not yet known. |
| </span><span class="kw">fn </span>indexable() -> bool { |
| <span class="bool-val">false |
| </span>} |
| } |
| |
| <span class="doccomment">/// Runs an unzip-like operation into default `ParallelExtend` collections. |
| </span><span class="kw">fn </span>execute<I, OP, FromA, FromB>(pi: I, op: OP) -> (FromA, FromB) |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| OP: UnzipOp<I::Item>, |
| FromA: Default + Send + ParallelExtend<OP::Left>, |
| FromB: Default + Send + ParallelExtend<OP::Right>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>a = FromA::default(); |
| <span class="kw">let </span><span class="kw-2">mut </span>b = FromB::default(); |
| execute_into(<span class="kw-2">&mut </span>a, <span class="kw-2">&mut </span>b, pi, op); |
| (a, b) |
| } |
| |
| <span class="doccomment">/// Runs an unzip-like operation into `ParallelExtend` collections. |
| </span><span class="kw">fn </span>execute_into<I, OP, FromA, FromB>(a: <span class="kw-2">&mut </span>FromA, b: <span class="kw-2">&mut </span>FromB, pi: I, op: OP) |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| OP: UnzipOp<I::Item>, |
| FromA: Send + ParallelExtend<OP::Left>, |
| FromB: Send + ParallelExtend<OP::Right>, |
| { |
| <span class="comment">// We have no idea what the consumers will look like for these |
| // collections' `par_extend`, but we can intercept them in our own |
| // `drive_unindexed`. Start with the left side, type `A`: |
| </span><span class="kw">let </span>iter = UnzipA { base: pi, op, b }; |
| a.par_extend(iter); |
| } |
| |
| <span class="doccomment">/// Unzips the items of a parallel iterator into a pair of arbitrary |
| /// `ParallelExtend` containers. |
| /// |
| /// This is called by `ParallelIterator::unzip`. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>unzip<I, A, B, FromA, FromB>(pi: I) -> (FromA, FromB) |
| <span class="kw">where |
| </span>I: ParallelIterator<Item = (A, B)>, |
| FromA: Default + Send + ParallelExtend<A>, |
| FromB: Default + Send + ParallelExtend<B>, |
| A: Send, |
| B: Send, |
| { |
| execute(pi, Unzip) |
| } |
| |
| <span class="doccomment">/// Unzips an `IndexedParallelIterator` into two arbitrary `Consumer`s. |
| /// |
| /// This is called by `super::collect::unzip_into_vecs`. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>unzip_indexed<I, A, B, CA, CB>(pi: I, left: CA, right: CB) -> (CA::Result, CB::Result) |
| <span class="kw">where |
| </span>I: IndexedParallelIterator<Item = (A, B)>, |
| CA: Consumer<A>, |
| CB: Consumer<B>, |
| A: Send, |
| B: Send, |
| { |
| <span class="kw">let </span>consumer = UnzipConsumer { |
| op: <span class="kw-2">&</span>Unzip, |
| left, |
| right, |
| }; |
| pi.drive(consumer) |
| } |
| |
| <span class="doccomment">/// An `UnzipOp` that splits a tuple directly into the two consumers. |
| </span><span class="kw">struct </span>Unzip; |
| |
| <span class="kw">impl</span><A: Send, B: Send> UnzipOp<(A, B)> <span class="kw">for </span>Unzip { |
| <span class="kw">type </span>Left = A; |
| <span class="kw">type </span>Right = B; |
| |
| <span class="kw">fn </span>consume<FA, FB>(<span class="kw-2">&</span><span class="self">self</span>, item: (A, B), left: FA, right: FB) -> (FA, FB) |
| <span class="kw">where |
| </span>FA: Folder<A>, |
| FB: Folder<B>, |
| { |
| (left.consume(item.<span class="number">0</span>), right.consume(item.<span class="number">1</span>)) |
| } |
| |
| <span class="kw">fn </span>indexable() -> bool { |
| <span class="bool-val">true |
| </span>} |
| } |
| |
| <span class="doccomment">/// Partitions the items of a parallel iterator into a pair of arbitrary |
| /// `ParallelExtend` containers. |
| /// |
| /// This is called by `ParallelIterator::partition`. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>partition<I, A, B, P>(pi: I, predicate: P) -> (A, B) |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| A: Default + Send + ParallelExtend<I::Item>, |
| B: Default + Send + ParallelExtend<I::Item>, |
| P: Fn(<span class="kw-2">&</span>I::Item) -> bool + Sync + Send, |
| { |
| execute(pi, Partition { predicate }) |
| } |
| |
| <span class="doccomment">/// An `UnzipOp` that routes items depending on a predicate function. |
| </span><span class="kw">struct </span>Partition<P> { |
| predicate: P, |
| } |
| |
| <span class="kw">impl</span><P, T> UnzipOp<T> <span class="kw">for </span>Partition<P> |
| <span class="kw">where |
| </span>P: Fn(<span class="kw-2">&</span>T) -> bool + Sync + Send, |
| T: Send, |
| { |
| <span class="kw">type </span>Left = T; |
| <span class="kw">type </span>Right = T; |
| |
| <span class="kw">fn </span>consume<FA, FB>(<span class="kw-2">&</span><span class="self">self</span>, item: T, left: FA, right: FB) -> (FA, FB) |
| <span class="kw">where |
| </span>FA: Folder<T>, |
| FB: Folder<T>, |
| { |
| <span class="kw">if </span>(<span class="self">self</span>.predicate)(<span class="kw-2">&</span>item) { |
| (left.consume(item), right) |
| } <span class="kw">else </span>{ |
| (left, right.consume(item)) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Partitions and maps the items of a parallel iterator into a pair of |
| /// arbitrary `ParallelExtend` containers. |
| /// |
| /// This called by `ParallelIterator::partition_map`. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>partition_map<I, A, B, P, L, R>(pi: I, predicate: P) -> (A, B) |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| A: Default + Send + ParallelExtend<L>, |
| B: Default + Send + ParallelExtend<R>, |
| P: Fn(I::Item) -> Either<L, R> + Sync + Send, |
| L: Send, |
| R: Send, |
| { |
| execute(pi, PartitionMap { predicate }) |
| } |
| |
| <span class="doccomment">/// An `UnzipOp` that routes items depending on how they are mapped `Either`. |
| </span><span class="kw">struct </span>PartitionMap<P> { |
| predicate: P, |
| } |
| |
| <span class="kw">impl</span><P, L, R, T> UnzipOp<T> <span class="kw">for </span>PartitionMap<P> |
| <span class="kw">where |
| </span>P: Fn(T) -> Either<L, R> + Sync + Send, |
| L: Send, |
| R: Send, |
| { |
| <span class="kw">type </span>Left = L; |
| <span class="kw">type </span>Right = R; |
| |
| <span class="kw">fn </span>consume<FA, FB>(<span class="kw-2">&</span><span class="self">self</span>, item: T, left: FA, right: FB) -> (FA, FB) |
| <span class="kw">where |
| </span>FA: Folder<L>, |
| FB: Folder<R>, |
| { |
| <span class="kw">match </span>(<span class="self">self</span>.predicate)(item) { |
| Either::Left(item) => (left.consume(item), right), |
| Either::Right(item) => (left, right.consume(item)), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// A fake iterator to intercept the `Consumer` for type `A`. |
| </span><span class="kw">struct </span>UnzipA<<span class="lifetime">'b</span>, I, OP, FromB> { |
| base: I, |
| op: OP, |
| b: <span class="kw-2">&</span><span class="lifetime">'b </span><span class="kw-2">mut </span>FromB, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'b</span>, I, OP, FromB> ParallelIterator <span class="kw">for </span>UnzipA<<span class="lifetime">'b</span>, I, OP, FromB> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| OP: UnzipOp<I::Item>, |
| FromB: Send + ParallelExtend<OP::Right>, |
| { |
| <span class="kw">type </span>Item = OP::Left; |
| |
| <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>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>result = <span class="prelude-val">None</span>; |
| { |
| <span class="comment">// Now it's time to find the consumer for type `B` |
| </span><span class="kw">let </span>iter = UnzipB { |
| base: <span class="self">self</span>.base, |
| op: <span class="self">self</span>.op, |
| left_consumer: consumer, |
| left_result: <span class="kw-2">&mut </span>result, |
| }; |
| <span class="self">self</span>.b.par_extend(iter); |
| } |
| <span class="comment">// NB: If for some reason `b.par_extend` doesn't actually drive the |
| // iterator, then we won't have a result for the left side to return |
| // at all. We can't fake an arbitrary consumer's result, so panic. |
| </span>result.expect(<span class="string">"unzip consumers didn't execute!"</span>) |
| } |
| |
| <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="kw">if </span>OP::indexable() { |
| <span class="self">self</span>.base.opt_len() |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="doccomment">/// A fake iterator to intercept the `Consumer` for type `B`. |
| </span><span class="kw">struct </span>UnzipB<<span class="lifetime">'r</span>, I, OP, CA> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| OP: UnzipOp<I::Item>, |
| CA: UnindexedConsumer<OP::Left>, |
| CA::Result: <span class="lifetime">'r</span>, |
| { |
| base: I, |
| op: OP, |
| left_consumer: CA, |
| left_result: <span class="kw-2">&</span><span class="lifetime">'r </span><span class="kw-2">mut </span><span class="prelude-ty">Option</span><CA::Result>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, I, OP, CA> ParallelIterator <span class="kw">for </span>UnzipB<<span class="lifetime">'r</span>, I, OP, CA> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| OP: UnzipOp<I::Item>, |
| CA: UnindexedConsumer<OP::Left>, |
| { |
| <span class="kw">type </span>Item = OP::Right; |
| |
| <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>, |
| { |
| <span class="comment">// Now that we have two consumers, we can unzip the real iterator. |
| </span><span class="kw">let </span>consumer = UnzipConsumer { |
| op: <span class="kw-2">&</span><span class="self">self</span>.op, |
| left: <span class="self">self</span>.left_consumer, |
| right: consumer, |
| }; |
| |
| <span class="kw">let </span>result = <span class="self">self</span>.base.drive_unindexed(consumer); |
| <span class="kw-2">*</span><span class="self">self</span>.left_result = <span class="prelude-val">Some</span>(result.<span class="number">0</span>); |
| result.<span class="number">1 |
| </span>} |
| |
| <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="kw">if </span>OP::indexable() { |
| <span class="self">self</span>.base.opt_len() |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="doccomment">/// `Consumer` that unzips into two other `Consumer`s |
| </span><span class="kw">struct </span>UnzipConsumer<<span class="lifetime">'a</span>, OP, CA, CB> { |
| op: <span class="kw-2">&</span><span class="lifetime">'a </span>OP, |
| left: CA, |
| right: CB, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, OP, CA, CB> Consumer<T> <span class="kw">for </span>UnzipConsumer<<span class="lifetime">'a</span>, OP, CA, CB> |
| <span class="kw">where |
| </span>OP: UnzipOp<T>, |
| CA: Consumer<OP::Left>, |
| CB: Consumer<OP::Right>, |
| { |
| <span class="kw">type </span>Folder = UnzipFolder<<span class="lifetime">'a</span>, OP, CA::Folder, CB::Folder>; |
| <span class="kw">type </span>Reducer = UnzipReducer<CA::Reducer, CB::Reducer>; |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= (CA::Result, CB::Result); |
| |
| <span class="kw">fn </span>split_at(<span class="self">self</span>, index: usize) -> (<span class="self">Self</span>, <span class="self">Self</span>, <span class="self">Self</span>::Reducer) { |
| <span class="kw">let </span>(left1, left2, left_reducer) = <span class="self">self</span>.left.split_at(index); |
| <span class="kw">let </span>(right1, right2, right_reducer) = <span class="self">self</span>.right.split_at(index); |
| |
| ( |
| UnzipConsumer { |
| op: <span class="self">self</span>.op, |
| left: left1, |
| right: right1, |
| }, |
| UnzipConsumer { |
| op: <span class="self">self</span>.op, |
| left: left2, |
| right: right2, |
| }, |
| UnzipReducer { |
| left: left_reducer, |
| right: right_reducer, |
| }, |
| ) |
| } |
| |
| <span class="kw">fn </span>into_folder(<span class="self">self</span>) -> <span class="self">Self</span>::Folder { |
| UnzipFolder { |
| op: <span class="self">self</span>.op, |
| left: <span class="self">self</span>.left.into_folder(), |
| right: <span class="self">self</span>.right.into_folder(), |
| } |
| } |
| |
| <span class="kw">fn </span>full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="comment">// don't stop until everyone is full |
| </span><span class="self">self</span>.left.full() && <span class="self">self</span>.right.full() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, OP, CA, CB> UnindexedConsumer<T> <span class="kw">for </span>UnzipConsumer<<span class="lifetime">'a</span>, OP, CA, CB> |
| <span class="kw">where |
| </span>OP: UnzipOp<T>, |
| CA: UnindexedConsumer<OP::Left>, |
| CB: UnindexedConsumer<OP::Right>, |
| { |
| <span class="kw">fn </span>split_off_left(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| UnzipConsumer { |
| op: <span class="self">self</span>.op, |
| left: <span class="self">self</span>.left.split_off_left(), |
| right: <span class="self">self</span>.right.split_off_left(), |
| } |
| } |
| |
| <span class="kw">fn </span>to_reducer(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Reducer { |
| UnzipReducer { |
| left: <span class="self">self</span>.left.to_reducer(), |
| right: <span class="self">self</span>.right.to_reducer(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// `Folder` that unzips into two other `Folder`s |
| </span><span class="kw">struct </span>UnzipFolder<<span class="lifetime">'a</span>, OP, FA, FB> { |
| op: <span class="kw-2">&</span><span class="lifetime">'a </span>OP, |
| left: FA, |
| right: FB, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T, OP, FA, FB> Folder<T> <span class="kw">for </span>UnzipFolder<<span class="lifetime">'a</span>, OP, FA, FB> |
| <span class="kw">where |
| </span>OP: UnzipOp<T>, |
| FA: Folder<OP::Left>, |
| FB: Folder<OP::Right>, |
| { |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= (FA::Result, FB::Result); |
| |
| <span class="kw">fn </span>consume(<span class="self">self</span>, item: T) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>(left, right) = <span class="self">self</span>.op.consume(item, <span class="self">self</span>.left, <span class="self">self</span>.right); |
| UnzipFolder { |
| op: <span class="self">self</span>.op, |
| left, |
| right, |
| } |
| } |
| |
| <span class="kw">fn </span>complete(<span class="self">self</span>) -> <span class="self">Self</span>::Result { |
| (<span class="self">self</span>.left.complete(), <span class="self">self</span>.right.complete()) |
| } |
| |
| <span class="kw">fn </span>full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="comment">// don't stop until everyone is full |
| </span><span class="self">self</span>.left.full() && <span class="self">self</span>.right.full() |
| } |
| } |
| |
| <span class="doccomment">/// `Reducer` that unzips into two other `Reducer`s |
| </span><span class="kw">struct </span>UnzipReducer<RA, RB> { |
| left: RA, |
| right: RB, |
| } |
| |
| <span class="kw">impl</span><A, B, RA, RB> Reducer<(A, B)> <span class="kw">for </span>UnzipReducer<RA, RB> |
| <span class="kw">where |
| </span>RA: Reducer<A>, |
| RB: Reducer<B>, |
| { |
| <span class="kw">fn </span>reduce(<span class="self">self</span>, left: (A, B), right: (A, B)) -> (A, B) { |
| ( |
| <span class="self">self</span>.left.reduce(left.<span class="number">0</span>, right.<span class="number">0</span>), |
| <span class="self">self</span>.right.reduce(left.<span class="number">1</span>, right.<span class="number">1</span>), |
| ) |
| } |
| } |
| |
| <span class="kw">impl</span><A, B, FromA, FromB> ParallelExtend<(A, B)> <span class="kw">for </span>(FromA, FromB) |
| <span class="kw">where |
| </span>A: Send, |
| B: Send, |
| FromA: Send + ParallelExtend<A>, |
| FromB: Send + ParallelExtend<B>, |
| { |
| <span class="kw">fn </span>par_extend<I>(<span class="kw-2">&mut </span><span class="self">self</span>, pi: I) |
| <span class="kw">where |
| </span>I: IntoParallelIterator<Item = (A, B)>, |
| { |
| execute_into(<span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">0</span>, <span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">1</span>, pi.into_par_iter(), Unzip); |
| } |
| } |
| |
| <span class="kw">impl</span><L, R, A, B> ParallelExtend<Either<L, R>> <span class="kw">for </span>(A, B) |
| <span class="kw">where |
| </span>L: Send, |
| R: Send, |
| A: Send + ParallelExtend<L>, |
| B: Send + ParallelExtend<R>, |
| { |
| <span class="kw">fn </span>par_extend<I>(<span class="kw-2">&mut </span><span class="self">self</span>, pi: I) |
| <span class="kw">where |
| </span>I: IntoParallelIterator<Item = Either<L, R>>, |
| { |
| execute_into(<span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">0</span>, <span class="kw-2">&mut </span><span class="self">self</span>.<span class="number">1</span>, pi.into_par_iter(), UnEither); |
| } |
| } |
| |
| <span class="doccomment">/// An `UnzipOp` that routes items depending on their `Either` variant. |
| </span><span class="kw">struct </span>UnEither; |
| |
| <span class="kw">impl</span><L, R> UnzipOp<Either<L, R>> <span class="kw">for </span>UnEither |
| <span class="kw">where |
| </span>L: Send, |
| R: Send, |
| { |
| <span class="kw">type </span>Left = L; |
| <span class="kw">type </span>Right = R; |
| |
| <span class="kw">fn </span>consume<FL, FR>(<span class="kw-2">&</span><span class="self">self</span>, item: Either<L, R>, left: FL, right: FR) -> (FL, FR) |
| <span class="kw">where |
| </span>FL: Folder<L>, |
| FR: Folder<R>, |
| { |
| <span class="kw">match </span>item { |
| Either::Left(item) => (left.consume(item), right), |
| Either::Right(item) => (left, right.consume(item)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B, FromA, FromB> FromParallelIterator<(A, B)> <span class="kw">for </span>(FromA, FromB) |
| <span class="kw">where |
| </span>A: Send, |
| B: Send, |
| FromA: Send + FromParallelIterator<A>, |
| FromB: Send + FromParallelIterator<B>, |
| { |
| <span class="kw">fn </span>from_par_iter<I>(pi: I) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>I: IntoParallelIterator<Item = (A, B)>, |
| { |
| <span class="kw">let </span>(a, b): (Collector<FromA>, Collector<FromB>) = pi.into_par_iter().unzip(); |
| (a.result.unwrap(), b.result.unwrap()) |
| } |
| } |
| |
| <span class="kw">impl</span><L, R, A, B> FromParallelIterator<Either<L, R>> <span class="kw">for </span>(A, B) |
| <span class="kw">where |
| </span>L: Send, |
| R: Send, |
| A: Send + FromParallelIterator<L>, |
| B: Send + FromParallelIterator<R>, |
| { |
| <span class="kw">fn </span>from_par_iter<I>(pi: I) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>I: IntoParallelIterator<Item = Either<L, R>>, |
| { |
| <span class="kw">fn </span>identity<T>(x: T) -> T { |
| x |
| } |
| |
| <span class="kw">let </span>(a, b): (Collector<A>, Collector<B>) = pi.into_par_iter().partition_map(identity); |
| (a.result.unwrap(), b.result.unwrap()) |
| } |
| } |
| |
| <span class="doccomment">/// Shim to implement a one-time `ParallelExtend` using `FromParallelIterator`. |
| </span><span class="kw">struct </span>Collector<FromT> { |
| result: <span class="prelude-ty">Option</span><FromT>, |
| } |
| |
| <span class="kw">impl</span><FromT> Default <span class="kw">for </span>Collector<FromT> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| Collector { result: <span class="prelude-val">None </span>} |
| } |
| } |
| |
| <span class="kw">impl</span><T, FromT> ParallelExtend<T> <span class="kw">for </span>Collector<FromT> |
| <span class="kw">where |
| </span>T: Send, |
| FromT: Send + FromParallelIterator<T>, |
| { |
| <span class="kw">fn </span>par_extend<I>(<span class="kw-2">&mut </span><span class="self">self</span>, pi: I) |
| <span class="kw">where |
| </span>I: IntoParallelIterator<Item = T>, |
| { |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.result.is_none()); |
| <span class="self">self</span>.result = <span class="prelude-val">Some</span>(pi.into_par_iter().collect()); |
| } |
| } |
| </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> |
