| <!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/range_inclusive.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>range_inclusive.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> |
| </pre><pre class="rust"><code><span class="doccomment">//! Parallel iterator types for [inclusive ranges][std::range], |
| //! the type for values created by `a..=b` expressions |
| //! |
| //! You will rarely need to interact with this module directly unless you have |
| //! need to name one of the iterator types. |
| //! |
| //! ``` |
| //! use rayon::prelude::*; |
| //! |
| //! let r = (0..=100u64).into_par_iter() |
| //! .sum(); |
| //! |
| //! // compare result with sequential calculation |
| //! assert_eq!((0..=100).sum::<u64>(), r); |
| //! ``` |
| //! |
| //! [std::range]: https://doc.rust-lang.org/core/ops/struct.RangeInclusive.html |
| |
| </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>std::char; |
| <span class="kw">use </span>std::ops::RangeInclusive; |
| |
| <span class="doccomment">/// Parallel iterator over an inclusive range, implemented for all integer types and `char`. |
| /// |
| /// **Note:** The `zip` operation requires `IndexedParallelIterator` |
| /// which is only implemented for `u8`, `i8`, `u16`, `i16`, and `char`. |
| /// |
| /// ``` |
| /// use rayon::prelude::*; |
| /// |
| /// let p = (0..=25u16).into_par_iter() |
| /// .zip(0..=25u16) |
| /// .filter(|&(x, y)| x % 5 == 0 || y % 5 == 0) |
| /// .map(|(x, y)| x * y) |
| /// .sum::<u16>(); |
| /// |
| /// let s = (0..=25u16).zip(0..=25u16) |
| /// .filter(|&(x, y)| x % 5 == 0 || y % 5 == 0) |
| /// .map(|(x, y)| x * y) |
| /// .sum(); |
| /// |
| /// assert_eq!(p, s); |
| /// ``` |
| </span><span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>Iter<T> { |
| range: RangeInclusive<T>, |
| } |
| |
| <span class="kw">impl</span><T> Iter<T> |
| <span class="kw">where |
| </span>RangeInclusive<T>: Eq, |
| T: Ord + Copy, |
| { |
| <span class="doccomment">/// Returns `Some((start, end))` for `start..=end`, or `None` if it is exhausted. |
| /// |
| /// Note that `RangeInclusive` does not specify the bounds of an exhausted iterator, |
| /// so this is a way for us to figure out what we've got. Thankfully, all of the |
| /// integer types we care about can be trivially cloned. |
| </span><span class="kw">fn </span>bounds(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><(T, T)> { |
| <span class="kw">let </span>start = <span class="kw-2">*</span><span class="self">self</span>.range.start(); |
| <span class="kw">let </span>end = <span class="kw-2">*</span><span class="self">self</span>.range.end(); |
| <span class="kw">if </span>start <= end && <span class="self">self</span>.range == (start..=end) { |
| <span class="comment">// If the range is still nonempty, this is obviously true |
| // If the range is exhausted, either start > end or |
| // the range does not equal start..=end. |
| </span><span class="prelude-val">Some</span>((start, end)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="doccomment">/// Implemented for ranges of all primitive integer types and `char`. |
| </span><span class="kw">impl</span><T> IntoParallelIterator <span class="kw">for </span>RangeInclusive<T> |
| <span class="kw">where |
| </span>Iter<T>: ParallelIterator, |
| { |
| <span class="kw">type </span>Item = <Iter<T> <span class="kw">as </span>ParallelIterator>::Item; |
| <span class="kw">type </span>Iter = Iter<T>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| Iter { range: <span class="self">self </span>} |
| } |
| } |
| |
| <span class="doccomment">/// These traits help drive integer type inference. Without them, an unknown `{integer}` type only |
| /// has constraints on `Iter<{integer}>`, which will probably give up and use `i32`. By adding |
| /// these traits on the item type, the compiler can see a more direct constraint to infer like |
| /// `{integer}: RangeInteger`, which works better. See `test_issue_833` for an example. |
| /// |
| /// They have to be `pub` since they're seen in the public `impl ParallelIterator` constraints, but |
| /// we put them in a private modules so they're not actually reachable in our public API. |
| </span><span class="kw">mod </span>private { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Implementation details of `ParallelIterator for Iter<Self>` |
| </span><span class="kw">pub trait </span>RangeInteger: Sized + Send { |
| <span class="macro">private_decl! </span>{} |
| |
| <span class="kw">fn </span>drive_unindexed<C>(iter: Iter<<span class="self">Self</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="self">Self</span>>; |
| |
| <span class="kw">fn </span>opt_len(iter: <span class="kw-2">&</span>Iter<<span class="self">Self</span>>) -> <span class="prelude-ty">Option</span><usize>; |
| } |
| |
| <span class="doccomment">/// Implementation details of `IndexedParallelIterator for Iter<Self>` |
| </span><span class="kw">pub trait </span>IndexedRangeInteger: RangeInteger { |
| <span class="macro">private_decl! </span>{} |
| |
| <span class="kw">fn </span>drive<C>(iter: Iter<<span class="self">Self</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="self">Self</span>>; |
| |
| <span class="kw">fn </span>len(iter: <span class="kw-2">&</span>Iter<<span class="self">Self</span>>) -> usize; |
| |
| <span class="kw">fn </span>with_producer<CB>(iter: Iter<<span class="self">Self</span>>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="self">Self</span>>; |
| } |
| } |
| <span class="kw">use </span>private::{IndexedRangeInteger, RangeInteger}; |
| |
| <span class="kw">impl</span><T: RangeInteger> ParallelIterator <span class="kw">for </span>Iter<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<T>, |
| { |
| T::drive_unindexed(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="attribute">#[inline] |
| </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> { |
| T::opt_len(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><T: IndexedRangeInteger> IndexedParallelIterator <span class="kw">for </span>Iter<T> { |
| <span class="kw">fn </span>drive<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<T>, |
| { |
| T::drive(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| T::len(<span class="self">self</span>) |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(<span class="self">self</span>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<T>, |
| { |
| T::with_producer(<span class="self">self</span>, callback) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>convert { |
| ( <span class="macro-nonterminal">$iter</span>:ident . <span class="macro-nonterminal">$method</span>:ident ( $( <span class="macro-nonterminal">$arg</span>:expr ),* ) ) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((start, end)) = <span class="macro-nonterminal">$iter</span>.bounds() { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(end) = end.checked_add(<span class="number">1</span>) { |
| (start..end).into_par_iter().<span class="macro-nonterminal">$method</span>($( <span class="macro-nonterminal">$arg </span>),<span class="kw-2">*</span>) |
| } <span class="kw">else </span>{ |
| (start..end).into_par_iter().chain(once(end)).<span class="macro-nonterminal">$method</span>($( <span class="macro-nonterminal">$arg </span>),<span class="kw-2">*</span>) |
| } |
| } <span class="kw">else </span>{ |
| empty::<<span class="self">Self</span>>().<span class="macro-nonterminal">$method</span>($( <span class="macro-nonterminal">$arg </span>),<span class="kw-2">*</span>) |
| } |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>parallel_range_impl { |
| ( <span class="macro-nonterminal">$t</span>:ty ) => { |
| <span class="kw">impl </span>RangeInteger <span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="macro">private_impl! </span>{} |
| |
| <span class="kw">fn </span>drive_unindexed<C>(iter: Iter<<span class="macro-nonterminal">$t</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="macro-nonterminal">$t</span>>, |
| { |
| <span class="macro">convert!</span>(iter.drive_unindexed(consumer)) |
| } |
| |
| <span class="kw">fn </span>opt_len(iter: <span class="kw-2">&</span>Iter<<span class="macro-nonterminal">$t</span>>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="macro">convert!</span>(iter.opt_len()) |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">macro_rules! </span>indexed_range_impl { |
| ( <span class="macro-nonterminal">$t</span>:ty ) => { |
| <span class="macro">parallel_range_impl! </span>{ <span class="macro-nonterminal">$t </span>} |
| |
| <span class="kw">impl </span>IndexedRangeInteger <span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="macro">private_impl! </span>{} |
| |
| <span class="kw">fn </span>drive<C>(iter: Iter<<span class="macro-nonterminal">$t</span>>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="macro-nonterminal">$t</span>>, |
| { |
| <span class="macro">convert!</span>(iter.drive(consumer)) |
| } |
| |
| <span class="kw">fn </span>len(iter: <span class="kw-2">&</span>Iter<<span class="macro-nonterminal">$t</span>>) -> usize { |
| iter.range.len() |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(iter: Iter<<span class="macro-nonterminal">$t</span>>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="macro-nonterminal">$t</span>>, |
| { |
| <span class="macro">convert!</span>(iter.with_producer(callback)) |
| } |
| } |
| }; |
| } |
| |
| <span class="comment">// all RangeInclusive<T> with ExactSizeIterator |
| </span><span class="macro">indexed_range_impl! </span>{u8} |
| <span class="macro">indexed_range_impl! </span>{u16} |
| <span class="macro">indexed_range_impl! </span>{i8} |
| <span class="macro">indexed_range_impl! </span>{i16} |
| |
| <span class="comment">// other RangeInclusive<T> with just Iterator |
| </span><span class="macro">parallel_range_impl! </span>{usize} |
| <span class="macro">parallel_range_impl! </span>{isize} |
| <span class="macro">parallel_range_impl! </span>{u32} |
| <span class="macro">parallel_range_impl! </span>{i32} |
| <span class="macro">parallel_range_impl! </span>{u64} |
| <span class="macro">parallel_range_impl! </span>{i64} |
| <span class="macro">parallel_range_impl! </span>{u128} |
| <span class="macro">parallel_range_impl! </span>{i128} |
| |
| <span class="comment">// char is special |
| </span><span class="macro">macro_rules! </span>convert_char { |
| ( <span class="macro-nonterminal">$self</span>:ident . <span class="macro-nonterminal">$method</span>:ident ( $( <span class="macro-nonterminal">$arg</span>:expr ),* ) ) => { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((start, end)) = <span class="macro-nonterminal">$self</span>.bounds() { |
| <span class="kw">let </span>start = start <span class="kw">as </span>u32; |
| <span class="kw">let </span>end = end <span class="kw">as </span>u32; |
| <span class="kw">if </span>start < <span class="number">0xD800 </span>&& <span class="number">0xE000 </span><= end { |
| <span class="comment">// chain the before and after surrogate range fragments |
| </span>(start..<span class="number">0xD800</span>) |
| .into_par_iter() |
| .chain(<span class="number">0xE000</span>..end + <span class="number">1</span>) <span class="comment">// cannot use RangeInclusive, so add one to end |
| </span>.map(|codepoint| <span class="kw">unsafe </span>{ char::from_u32_unchecked(codepoint) }) |
| .<span class="macro-nonterminal">$method</span>($( <span class="macro-nonterminal">$arg </span>),<span class="kw-2">*</span>) |
| } <span class="kw">else </span>{ |
| <span class="comment">// no surrogate range to worry about |
| </span>(start..end + <span class="number">1</span>) <span class="comment">// cannot use RangeInclusive, so add one to end |
| </span>.into_par_iter() |
| .map(|codepoint| <span class="kw">unsafe </span>{ char::from_u32_unchecked(codepoint) }) |
| .<span class="macro-nonterminal">$method</span>($( <span class="macro-nonterminal">$arg </span>),<span class="kw-2">*</span>) |
| } |
| } <span class="kw">else </span>{ |
| empty::<char>().<span class="macro-nonterminal">$method</span>($( <span class="macro-nonterminal">$arg </span>),<span class="kw-2">*</span>) |
| } |
| }; |
| } |
| |
| <span class="kw">impl </span>ParallelIterator <span class="kw">for </span>Iter<char> { |
| <span class="kw">type </span>Item = char; |
| |
| <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="macro">convert_char!</span>(<span class="self">self</span>.drive(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="comment">// Range<u32> is broken on 16 bit platforms, may as well benefit from it |
| </span><span class="kw">impl </span>IndexedParallelIterator <span class="kw">for </span>Iter<char> { |
| <span class="comment">// Split at the surrogate range first if we're allowed to |
| </span><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>, |
| { |
| <span class="macro">convert_char!</span>(<span class="self">self</span>.drive(consumer)) |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((start, end)) = <span class="self">self</span>.bounds() { |
| <span class="comment">// Taken from <char as Step>::steps_between |
| </span><span class="kw">let </span>start = start <span class="kw">as </span>u32; |
| <span class="kw">let </span>end = end <span class="kw">as </span>u32; |
| <span class="kw">let </span><span class="kw-2">mut </span>count = end - start; |
| <span class="kw">if </span>start < <span class="number">0xD800 </span>&& <span class="number">0xE000 </span><= end { |
| count -= <span class="number">0x800 |
| </span>} |
| (count + <span class="number">1</span>) <span class="kw">as </span>usize <span class="comment">// add one for inclusive |
| </span>} <span class="kw">else </span>{ |
| <span class="number">0 |
| </span>} |
| } |
| |
| <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="macro">convert_char!</span>(<span class="self">self</span>.with_producer(callback)) |
| } |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg(target_pointer_width = <span class="string">"64"</span>)] |
| </span><span class="kw">fn </span>test_u32_opt_len() { |
| <span class="kw">use </span>std::u32; |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">101</span>), (<span class="number">0</span>..=<span class="number">100u32</span>).into_par_iter().opt_len()); |
| <span class="macro">assert_eq!</span>( |
| <span class="prelude-val">Some</span>(u32::MAX <span class="kw">as </span>usize), |
| (<span class="number">0</span>..=u32::MAX - <span class="number">1</span>).into_par_iter().opt_len() |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="prelude-val">Some</span>(u32::MAX <span class="kw">as </span>usize + <span class="number">1</span>), |
| (<span class="number">0</span>..=u32::MAX).into_par_iter().opt_len() |
| ); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_u64_opt_len() { |
| <span class="kw">use </span>std::{u64, usize}; |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">101</span>), (<span class="number">0</span>..=<span class="number">100u64</span>).into_par_iter().opt_len()); |
| <span class="macro">assert_eq!</span>( |
| <span class="prelude-val">Some</span>(usize::MAX), |
| (<span class="number">0</span>..=usize::MAX <span class="kw">as </span>u64 - <span class="number">1</span>).into_par_iter().opt_len() |
| ); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..=usize::MAX <span class="kw">as </span>u64).into_par_iter().opt_len()); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..=u64::MAX).into_par_iter().opt_len()); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_u128_opt_len() { |
| <span class="kw">use </span>std::{u128, usize}; |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">101</span>), (<span class="number">0</span>..=<span class="number">100u128</span>).into_par_iter().opt_len()); |
| <span class="macro">assert_eq!</span>( |
| <span class="prelude-val">Some</span>(usize::MAX), |
| (<span class="number">0</span>..=usize::MAX <span class="kw">as </span>u128 - <span class="number">1</span>).into_par_iter().opt_len() |
| ); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..=usize::MAX <span class="kw">as </span>u128).into_par_iter().opt_len()); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, (<span class="number">0</span>..=u128::MAX).into_par_iter().opt_len()); |
| } |
| |
| <span class="comment">// `usize as i64` can overflow, so make sure to wrap it appropriately |
| // when using the `opt_len` "indexed" mode. |
| </span><span class="attribute">#[test] |
| #[cfg(target_pointer_width = <span class="string">"64"</span>)] |
| </span><span class="kw">fn </span>test_usize_i64_overflow() { |
| <span class="kw">use </span><span class="kw">crate</span>::ThreadPoolBuilder; |
| <span class="kw">use </span>std::i64; |
| |
| <span class="kw">let </span>iter = (-<span class="number">2</span>..=i64::MAX).into_par_iter(); |
| <span class="macro">assert_eq!</span>(iter.opt_len(), <span class="prelude-val">Some</span>(i64::MAX <span class="kw">as </span>usize + <span class="number">3</span>)); |
| |
| <span class="comment">// always run with multiple threads to split into, or this will take forever... |
| </span><span class="kw">let </span>pool = ThreadPoolBuilder::new().num_threads(<span class="number">8</span>).build().unwrap(); |
| pool.install(|| <span class="macro">assert_eq!</span>(iter.find_last(|<span class="kw">_</span>| <span class="bool-val">true</span>), <span class="prelude-val">Some</span>(i64::MAX))); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_issue_833() { |
| <span class="kw">fn </span>is_even(n: i64) -> bool { |
| n % <span class="number">2 </span>== <span class="number">0 |
| </span>} |
| |
| <span class="comment">// The integer type should be inferred from `is_even` |
| </span><span class="kw">let </span>v: Vec<<span class="kw">_</span>> = (<span class="number">1</span>..=<span class="number">100</span>).into_par_iter().filter(|<span class="kw-2">&</span>x| is_even(x)).collect(); |
| <span class="macro">assert!</span>(v.into_iter().eq((<span class="number">2</span>..=<span class="number">100</span>).step_by(<span class="number">2</span>))); |
| |
| <span class="comment">// Try examples with indexed iterators too |
| </span><span class="kw">let </span>pos = (<span class="number">0</span>..=<span class="number">100</span>).into_par_iter().position_any(|x| x == <span class="number">50i16</span>); |
| <span class="macro">assert_eq!</span>(pos, <span class="prelude-val">Some</span>(<span class="number">50usize</span>)); |
| |
| <span class="macro">assert!</span>((<span class="number">0</span>..=<span class="number">100</span>) |
| .into_par_iter() |
| .zip(<span class="number">0</span>..=<span class="number">100</span>) |
| .all(|(a, b)| i16::eq(<span class="kw-2">&</span>a, <span class="kw-2">&</span>b))); |
| } |
| </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> |