| <!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/result.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>result.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> |
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| </pre><pre class="rust"><code><span class="doccomment">//! Parallel iterator types for [results][std::result] |
| //! |
| //! You will rarely need to interact with this module directly unless you need |
| //! to name one of the iterator types. |
| //! |
| //! [std::result]: https://doc.rust-lang.org/stable/std/result/ |
| |
| </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::sync::Mutex; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::option; |
| |
| <span class="doccomment">/// Parallel iterator over a result |
| </span><span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>IntoIter<T: Send> { |
| inner: option::IntoIter<T>, |
| } |
| |
| <span class="kw">impl</span><T: Send, E> IntoParallelIterator <span class="kw">for </span><span class="prelude-ty">Result</span><T, E> { |
| <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 { |
| inner: <span class="self">self</span>.ok().into_par_iter(), |
| } |
| } |
| } |
| |
| <span class="macro">delegate_indexed_iterator! </span>{ |
| IntoIter<T> => T, |
| <span class="kw">impl</span><T: Send> |
| } |
| |
| <span class="doccomment">/// Parallel iterator over an immutable reference to a result |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Iter<<span class="lifetime">'a</span>, T: Sync> { |
| inner: option::IntoIter<<span class="kw-2">&</span><span class="lifetime">'a </span>T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: Sync> Clone <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, T> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| Iter { |
| inner: <span class="self">self</span>.inner.clone(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: Sync, E> IntoParallelIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>T; |
| <span class="kw">type </span>Iter = Iter<<span class="lifetime">'a</span>, T>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| Iter { |
| inner: <span class="self">self</span>.as_ref().ok().into_par_iter(), |
| } |
| } |
| } |
| |
| <span class="macro">delegate_indexed_iterator! </span>{ |
| Iter<<span class="lifetime">'a</span>, T> => <span class="kw-2">&</span><span class="lifetime">'a </span>T, |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: Sync + <span class="lifetime">'a</span>> |
| } |
| |
| <span class="doccomment">/// Parallel iterator over a mutable reference to a result |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>IterMut<<span class="lifetime">'a</span>, T: Send> { |
| inner: option::IntoIter<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: Send, E> IntoParallelIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="prelude-ty">Result</span><T, E> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T; |
| <span class="kw">type </span>Iter = IterMut<<span class="lifetime">'a</span>, T>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| IterMut { |
| inner: <span class="self">self</span>.as_mut().ok().into_par_iter(), |
| } |
| } |
| } |
| |
| <span class="macro">delegate_indexed_iterator! </span>{ |
| IterMut<<span class="lifetime">'a</span>, T> => <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T, |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T: Send + <span class="lifetime">'a</span>> |
| } |
| |
| <span class="doccomment">/// Collect an arbitrary `Result`-wrapped collection. |
| /// |
| /// If any item is `Err`, then all previous `Ok` items collected are |
| /// discarded, and it returns that error. If there are multiple errors, the |
| /// one returned is not deterministic. |
| </span><span class="kw">impl</span><C, T, E> FromParallelIterator<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span><span class="prelude-ty">Result</span><C, E> |
| <span class="kw">where |
| </span>C: FromParallelIterator<T>, |
| T: Send, |
| E: Send, |
| { |
| <span class="kw">fn </span>from_par_iter<I>(par_iter: I) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>I: IntoParallelIterator<Item = <span class="prelude-ty">Result</span><T, E>>, |
| { |
| <span class="kw">fn </span>ok<T, E>(saved: <span class="kw-2">&</span>Mutex<<span class="prelude-ty">Option</span><E>>) -> <span class="kw">impl </span>Fn(<span class="prelude-ty">Result</span><T, E>) -> <span class="prelude-ty">Option</span><T> + <span class="lifetime">'_ </span>{ |
| <span class="kw">move </span>|item| <span class="kw">match </span>item { |
| <span class="prelude-val">Ok</span>(item) => <span class="prelude-val">Some</span>(item), |
| <span class="prelude-val">Err</span>(error) => { |
| <span class="comment">// We don't need a blocking `lock()`, as anybody |
| // else holding the lock will also be writing |
| // `Some(error)`, and then ours is irrelevant. |
| </span><span class="kw">if let </span><span class="prelude-val">Ok</span>(<span class="kw-2">mut </span>guard) = saved.try_lock() { |
| <span class="kw">if </span>guard.is_none() { |
| <span class="kw-2">*</span>guard = <span class="prelude-val">Some</span>(error); |
| } |
| } |
| <span class="prelude-val">None |
| </span>} |
| } |
| } |
| |
| <span class="kw">let </span>saved_error = Mutex::new(<span class="prelude-val">None</span>); |
| <span class="kw">let </span>collection = par_iter |
| .into_par_iter() |
| .map(ok(<span class="kw-2">&</span>saved_error)) |
| .while_some() |
| .collect(); |
| |
| <span class="kw">match </span>saved_error.into_inner().unwrap() { |
| <span class="prelude-val">Some</span>(error) => <span class="prelude-val">Err</span>(error), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Ok</span>(collection), |
| } |
| } |
| } |
| </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> |
