| <!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/len.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>len.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::cmp; |
| |
| <span class="doccomment">/// `MinLen` is an iterator that imposes a minimum length on iterator splits. |
| /// This struct is created by the [`with_min_len()`] method on [`IndexedParallelIterator`] |
| /// |
| /// [`with_min_len()`]: trait.IndexedParallelIterator.html#method.with_min_len |
| /// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html |
| </span><span class="attribute">#[must_use = <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>] |
| #[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>MinLen<I: IndexedParallelIterator> { |
| base: I, |
| min: usize, |
| } |
| |
| <span class="kw">impl</span><I> MinLen<I> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| { |
| <span class="doccomment">/// Creates a new `MinLen` iterator. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(base: I, min: usize) -> <span class="self">Self </span>{ |
| MinLen { base, min } |
| } |
| } |
| |
| <span class="kw">impl</span><I> ParallelIterator <span class="kw">for </span>MinLen<I> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| { |
| <span class="kw">type </span>Item = I::Item; |
| |
| <span class="kw">fn </span>drive_unindexed<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="self">Self</span>::Item>, |
| { |
| bridge(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="kw">fn </span>opt_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.len()) |
| } |
| } |
| |
| <span class="kw">impl</span><I> IndexedParallelIterator <span class="kw">for </span>MinLen<I> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| { |
| <span class="kw">fn </span>drive<C: Consumer<<span class="self">Self</span>::Item>>(<span class="self">self</span>, consumer: C) -> C::Result { |
| bridge(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.base.len() |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(<span class="self">self</span>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">return </span><span class="self">self</span>.base.with_producer(Callback { |
| callback, |
| min: <span class="self">self</span>.min, |
| }); |
| |
| <span class="kw">struct </span>Callback<CB> { |
| callback: CB, |
| min: usize, |
| } |
| |
| <span class="kw">impl</span><T, CB> ProducerCallback<T> <span class="kw">for </span>Callback<CB> |
| <span class="kw">where |
| </span>CB: ProducerCallback<T>, |
| { |
| <span class="kw">type </span>Output = CB::Output; |
| <span class="kw">fn </span>callback<P>(<span class="self">self</span>, base: P) -> CB::Output |
| <span class="kw">where |
| </span>P: Producer<Item = T>, |
| { |
| <span class="kw">let </span>producer = MinLenProducer { |
| base, |
| min: <span class="self">self</span>.min, |
| }; |
| <span class="self">self</span>.callback.callback(producer) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// //////////////////////////////////////////////////////////////////////// |
| /// `MinLenProducer` implementation |
| |
| </span><span class="kw">struct </span>MinLenProducer<P> { |
| base: P, |
| min: usize, |
| } |
| |
| <span class="kw">impl</span><P> Producer <span class="kw">for </span>MinLenProducer<P> |
| <span class="kw">where |
| </span>P: Producer, |
| { |
| <span class="kw">type </span>Item = P::Item; |
| <span class="kw">type </span>IntoIter = P::IntoIter; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.base.into_iter() |
| } |
| |
| <span class="kw">fn </span>min_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| cmp::max(<span class="self">self</span>.min, <span class="self">self</span>.base.min_len()) |
| } |
| |
| <span class="kw">fn </span>max_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.base.max_len() |
| } |
| |
| <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="kw">let </span>(left, right) = <span class="self">self</span>.base.split_at(index); |
| ( |
| MinLenProducer { |
| base: left, |
| min: <span class="self">self</span>.min, |
| }, |
| MinLenProducer { |
| base: right, |
| min: <span class="self">self</span>.min, |
| }, |
| ) |
| } |
| |
| <span class="kw">fn </span>fold_with<F>(<span class="self">self</span>, folder: F) -> F |
| <span class="kw">where |
| </span>F: Folder<<span class="self">Self</span>::Item>, |
| { |
| <span class="self">self</span>.base.fold_with(folder) |
| } |
| } |
| |
| <span class="doccomment">/// `MaxLen` is an iterator that imposes a maximum length on iterator splits. |
| /// This struct is created by the [`with_max_len()`] method on [`IndexedParallelIterator`] |
| /// |
| /// [`with_max_len()`]: trait.IndexedParallelIterator.html#method.with_max_len |
| /// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html |
| </span><span class="attribute">#[must_use = <span class="string">"iterator adaptors are lazy and do nothing unless consumed"</span>] |
| #[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>MaxLen<I: IndexedParallelIterator> { |
| base: I, |
| max: usize, |
| } |
| |
| <span class="kw">impl</span><I> MaxLen<I> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| { |
| <span class="doccomment">/// Creates a new `MaxLen` iterator. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(base: I, max: usize) -> <span class="self">Self </span>{ |
| MaxLen { base, max } |
| } |
| } |
| |
| <span class="kw">impl</span><I> ParallelIterator <span class="kw">for </span>MaxLen<I> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| { |
| <span class="kw">type </span>Item = I::Item; |
| |
| <span class="kw">fn </span>drive_unindexed<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: UnindexedConsumer<<span class="self">Self</span>::Item>, |
| { |
| bridge(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="kw">fn </span>opt_len(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.len()) |
| } |
| } |
| |
| <span class="kw">impl</span><I> IndexedParallelIterator <span class="kw">for </span>MaxLen<I> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| { |
| <span class="kw">fn </span>drive<C: Consumer<<span class="self">Self</span>::Item>>(<span class="self">self</span>, consumer: C) -> C::Result { |
| bridge(<span class="self">self</span>, consumer) |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.base.len() |
| } |
| |
| <span class="kw">fn </span>with_producer<CB>(<span class="self">self</span>, callback: CB) -> CB::Output |
| <span class="kw">where |
| </span>CB: ProducerCallback<<span class="self">Self</span>::Item>, |
| { |
| <span class="kw">return </span><span class="self">self</span>.base.with_producer(Callback { |
| callback, |
| max: <span class="self">self</span>.max, |
| }); |
| |
| <span class="kw">struct </span>Callback<CB> { |
| callback: CB, |
| max: usize, |
| } |
| |
| <span class="kw">impl</span><T, CB> ProducerCallback<T> <span class="kw">for </span>Callback<CB> |
| <span class="kw">where |
| </span>CB: ProducerCallback<T>, |
| { |
| <span class="kw">type </span>Output = CB::Output; |
| <span class="kw">fn </span>callback<P>(<span class="self">self</span>, base: P) -> CB::Output |
| <span class="kw">where |
| </span>P: Producer<Item = T>, |
| { |
| <span class="kw">let </span>producer = MaxLenProducer { |
| base, |
| max: <span class="self">self</span>.max, |
| }; |
| <span class="self">self</span>.callback.callback(producer) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// //////////////////////////////////////////////////////////////////////// |
| /// `MaxLenProducer` implementation |
| |
| </span><span class="kw">struct </span>MaxLenProducer<P> { |
| base: P, |
| max: usize, |
| } |
| |
| <span class="kw">impl</span><P> Producer <span class="kw">for </span>MaxLenProducer<P> |
| <span class="kw">where |
| </span>P: Producer, |
| { |
| <span class="kw">type </span>Item = P::Item; |
| <span class="kw">type </span>IntoIter = P::IntoIter; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.base.into_iter() |
| } |
| |
| <span class="kw">fn </span>min_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.base.min_len() |
| } |
| |
| <span class="kw">fn </span>max_len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| cmp::min(<span class="self">self</span>.max, <span class="self">self</span>.base.max_len()) |
| } |
| |
| <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="kw">let </span>(left, right) = <span class="self">self</span>.base.split_at(index); |
| ( |
| MaxLenProducer { |
| base: left, |
| max: <span class="self">self</span>.max, |
| }, |
| MaxLenProducer { |
| base: right, |
| max: <span class="self">self</span>.max, |
| }, |
| ) |
| } |
| |
| <span class="kw">fn </span>fold_with<F>(<span class="self">self</span>, folder: F) -> F |
| <span class="kw">where |
| </span>F: Folder<<span class="self">Self</span>::Item>, |
| { |
| <span class="self">self</span>.base.fold_with(folder) |
| } |
| } |
| </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> |