| <!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/positions.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>positions.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="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="kw">use </span>std::fmt::{<span class="self">self</span>, Debug}; |
| |
| <span class="doccomment">/// `Positions` takes a predicate `predicate` and filters out elements that match, |
| /// yielding their indices. |
| /// |
| /// This struct is created by the [`positions()`] method on [`IndexedParallelIterator`] |
| /// |
| /// [`positions()`]: trait.IndexedParallelIterator.html#method.positions |
| /// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html |
| </span><span class="attribute">#[must_use = <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>] |
| #[derive(Clone)] |
| </span><span class="kw">pub struct </span>Positions<I: IndexedParallelIterator, P> { |
| base: I, |
| predicate: P, |
| } |
| |
| <span class="kw">impl</span><I: IndexedParallelIterator + Debug, P> Debug <span class="kw">for </span>Positions<I, P> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.debug_struct(<span class="string">"Positions"</span>) |
| .field(<span class="string">"base"</span>, <span class="kw-2">&</span><span class="self">self</span>.base) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><I, P> Positions<I, P> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| { |
| <span class="doccomment">/// Create a new `Positions` iterator. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(base: I, predicate: P) -> <span class="self">Self </span>{ |
| Positions { base, predicate } |
| } |
| } |
| |
| <span class="kw">impl</span><I, P> ParallelIterator <span class="kw">for </span>Positions<I, P> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| P: Fn(I::Item) -> bool + Sync + Send, |
| { |
| <span class="kw">type </span>Item = usize; |
| |
| <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>consumer1 = PositionsConsumer::new(consumer, <span class="kw-2">&</span><span class="self">self</span>.predicate, <span class="number">0</span>); |
| <span class="self">self</span>.base.drive(consumer1) |
| } |
| } |
| |
| <span class="doccomment">/// //////////////////////////////////////////////////////////////////////// |
| /// Consumer implementation |
| |
| </span><span class="kw">struct </span>PositionsConsumer<<span class="lifetime">'p</span>, C, P> { |
| base: C, |
| predicate: <span class="kw-2">&</span><span class="lifetime">'p </span>P, |
| offset: usize, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'p</span>, C, P> PositionsConsumer<<span class="lifetime">'p</span>, C, P> { |
| <span class="kw">fn </span>new(base: C, predicate: <span class="kw-2">&</span><span class="lifetime">'p </span>P, offset: usize) -> <span class="self">Self </span>{ |
| PositionsConsumer { |
| base, |
| predicate, |
| offset, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'p</span>, T, C, P> Consumer<T> <span class="kw">for </span>PositionsConsumer<<span class="lifetime">'p</span>, C, P> |
| <span class="kw">where |
| </span>C: Consumer<usize>, |
| P: Fn(T) -> bool + Sync, |
| { |
| <span class="kw">type </span>Folder = PositionsFolder<<span class="lifetime">'p</span>, C::Folder, P>; |
| <span class="kw">type </span>Reducer = C::Reducer; |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= C::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>, C::Reducer) { |
| <span class="kw">let </span>(left, right, reducer) = <span class="self">self</span>.base.split_at(index); |
| ( |
| PositionsConsumer::new(left, <span class="self">self</span>.predicate, <span class="self">self</span>.offset), |
| PositionsConsumer::new(right, <span class="self">self</span>.predicate, <span class="self">self</span>.offset + index), |
| reducer, |
| ) |
| } |
| |
| <span class="kw">fn </span>into_folder(<span class="self">self</span>) -> <span class="self">Self</span>::Folder { |
| PositionsFolder { |
| base: <span class="self">self</span>.base.into_folder(), |
| predicate: <span class="self">self</span>.predicate, |
| offset: <span class="self">self</span>.offset, |
| } |
| } |
| |
| <span class="kw">fn </span>full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.base.full() |
| } |
| } |
| |
| <span class="kw">struct </span>PositionsFolder<<span class="lifetime">'p</span>, F, P> { |
| base: F, |
| predicate: <span class="kw-2">&</span><span class="lifetime">'p </span>P, |
| offset: usize, |
| } |
| |
| <span class="kw">impl</span><F, P, T> Folder<T> <span class="kw">for </span>PositionsFolder<<span class="lifetime">'_</span>, F, P> |
| <span class="kw">where |
| </span>F: Folder<usize>, |
| P: Fn(T) -> bool, |
| { |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= F::Result; |
| |
| <span class="kw">fn </span>consume(<span class="kw-2">mut </span><span class="self">self</span>, item: T) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>index = <span class="self">self</span>.offset; |
| <span class="self">self</span>.offset += <span class="number">1</span>; |
| <span class="kw">if </span>(<span class="self">self</span>.predicate)(item) { |
| <span class="self">self</span>.base = <span class="self">self</span>.base.consume(index); |
| } |
| <span class="self">self |
| </span>} |
| |
| <span class="comment">// This cannot easily specialize `consume_iter` to be better than |
| // the default, because that requires checking `self.base.full()` |
| // during a call to `self.base.consume_iter()`. (#632) |
| |
| </span><span class="kw">fn </span>complete(<span class="self">self</span>) -> <span class="self">Self</span>::Result { |
| <span class="self">self</span>.base.complete() |
| } |
| |
| <span class="kw">fn </span>full(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.base.full() |
| } |
| } |
| </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> |
