| <!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/fold.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fold.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="kw">impl</span><U, I, ID, F> Fold<I, ID, F> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| F: Fn(U, I::Item) -> U + Sync + Send, |
| ID: Fn() -> U + Sync + Send, |
| U: Send, |
| { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(base: I, identity: ID, fold_op: F) -> <span class="self">Self </span>{ |
| Fold { |
| base, |
| identity, |
| fold_op, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// `Fold` is an iterator that applies a function over an iterator producing a single value. |
| /// This struct is created by the [`fold()`] method on [`ParallelIterator`] |
| /// |
| /// [`fold()`]: trait.ParallelIterator.html#method.fold |
| /// [`ParallelIterator`]: trait.ParallelIterator.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>Fold<I, ID, F> { |
| base: I, |
| identity: ID, |
| fold_op: F, |
| } |
| |
| <span class="kw">impl</span><I: ParallelIterator + Debug, ID, F> Debug <span class="kw">for </span>Fold<I, ID, F> { |
| <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">"Fold"</span>).field(<span class="string">"base"</span>, <span class="kw-2">&</span><span class="self">self</span>.base).finish() |
| } |
| } |
| |
| <span class="kw">impl</span><U, I, ID, F> ParallelIterator <span class="kw">for </span>Fold<I, ID, F> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| F: Fn(U, I::Item) -> U + Sync + Send, |
| ID: Fn() -> U + Sync + Send, |
| U: Send, |
| { |
| <span class="kw">type </span>Item = U; |
| |
| <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 = FoldConsumer { |
| base: consumer, |
| fold_op: <span class="kw-2">&</span><span class="self">self</span>.fold_op, |
| identity: <span class="kw-2">&</span><span class="self">self</span>.identity, |
| }; |
| <span class="self">self</span>.base.drive_unindexed(consumer1) |
| } |
| } |
| |
| <span class="kw">struct </span>FoldConsumer<<span class="lifetime">'c</span>, C, ID, F> { |
| base: C, |
| fold_op: <span class="kw-2">&</span><span class="lifetime">'c </span>F, |
| identity: <span class="kw-2">&</span><span class="lifetime">'c </span>ID, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, U, T, C, ID, F> Consumer<T> <span class="kw">for </span>FoldConsumer<<span class="lifetime">'r</span>, C, ID, F> |
| <span class="kw">where |
| </span>C: Consumer<U>, |
| F: Fn(U, T) -> U + Sync, |
| ID: Fn() -> U + Sync, |
| U: Send, |
| { |
| <span class="kw">type </span>Folder = FoldFolder<<span class="lifetime">'r</span>, C::Folder, U, F>; |
| <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>, <span class="self">Self</span>::Reducer) { |
| <span class="kw">let </span>(left, right, reducer) = <span class="self">self</span>.base.split_at(index); |
| ( |
| FoldConsumer { base: left, ..<span class="self">self </span>}, |
| FoldConsumer { |
| base: right, |
| ..<span class="self">self |
| </span>}, |
| reducer, |
| ) |
| } |
| |
| <span class="kw">fn </span>into_folder(<span class="self">self</span>) -> <span class="self">Self</span>::Folder { |
| FoldFolder { |
| base: <span class="self">self</span>.base.into_folder(), |
| item: (<span class="self">self</span>.identity)(), |
| fold_op: <span class="self">self</span>.fold_op, |
| } |
| } |
| |
| <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">impl</span><<span class="lifetime">'r</span>, U, T, C, ID, F> UnindexedConsumer<T> <span class="kw">for </span>FoldConsumer<<span class="lifetime">'r</span>, C, ID, F> |
| <span class="kw">where |
| </span>C: UnindexedConsumer<U>, |
| F: Fn(U, T) -> U + Sync, |
| ID: Fn() -> U + Sync, |
| U: Send, |
| { |
| <span class="kw">fn </span>split_off_left(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| FoldConsumer { |
| base: <span class="self">self</span>.base.split_off_left(), |
| ..<span class="kw-2">*</span><span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">fn </span>to_reducer(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Reducer { |
| <span class="self">self</span>.base.to_reducer() |
| } |
| } |
| |
| <span class="kw">struct </span>FoldFolder<<span class="lifetime">'r</span>, C, ID, F> { |
| base: C, |
| fold_op: <span class="kw-2">&</span><span class="lifetime">'r </span>F, |
| item: ID, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, C, ID, F, T> Folder<T> <span class="kw">for </span>FoldFolder<<span class="lifetime">'r</span>, C, ID, F> |
| <span class="kw">where |
| </span>C: Folder<ID>, |
| F: Fn(ID, T) -> ID + Sync, |
| { |
| <span class="kw">type </span><span class="prelude-ty">Result </span>= C::Result; |
| |
| <span class="kw">fn </span>consume(<span class="self">self</span>, item: T) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>item = (<span class="self">self</span>.fold_op)(<span class="self">self</span>.item, item); |
| FoldFolder { |
| base: <span class="self">self</span>.base, |
| fold_op: <span class="self">self</span>.fold_op, |
| item, |
| } |
| } |
| |
| <span class="kw">fn </span>consume_iter<I>(<span class="self">self</span>, iter: I) -> <span class="self">Self |
| </span><span class="kw">where |
| </span>I: IntoIterator<Item = T>, |
| { |
| <span class="kw">fn </span>not_full<C, ID, T>(base: <span class="kw-2">&</span>C) -> <span class="kw">impl </span>Fn(<span class="kw-2">&</span>T) -> bool + <span class="lifetime">'_ |
| </span><span class="kw">where |
| </span>C: Folder<ID>, |
| { |
| <span class="kw">move </span>|<span class="kw">_</span>| !base.full() |
| } |
| |
| <span class="kw">let </span>base = <span class="self">self</span>.base; |
| <span class="kw">let </span>item = iter |
| .into_iter() |
| <span class="comment">// stop iterating if another thread has finished |
| </span>.take_while(not_full(<span class="kw-2">&</span>base)) |
| .fold(<span class="self">self</span>.item, <span class="self">self</span>.fold_op); |
| |
| FoldFolder { |
| base, |
| item, |
| fold_op: <span class="self">self</span>.fold_op, |
| } |
| } |
| |
| <span class="kw">fn </span>complete(<span class="self">self</span>) -> C::Result { |
| <span class="self">self</span>.base.consume(<span class="self">self</span>.item).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() |
| } |
| } |
| |
| <span class="comment">// /////////////////////////////////////////////////////////////////////////// |
| |
| </span><span class="kw">impl</span><U, I, F> FoldWith<I, U, F> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| F: Fn(U, I::Item) -> U + Sync + Send, |
| U: Send + Clone, |
| { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(base: I, item: U, fold_op: F) -> <span class="self">Self </span>{ |
| FoldWith { |
| base, |
| item, |
| fold_op, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// `FoldWith` is an iterator that applies a function over an iterator producing a single value. |
| /// This struct is created by the [`fold_with()`] method on [`ParallelIterator`] |
| /// |
| /// [`fold_with()`]: trait.ParallelIterator.html#method.fold_with |
| /// [`ParallelIterator`]: trait.ParallelIterator.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>FoldWith<I, U, F> { |
| base: I, |
| item: U, |
| fold_op: F, |
| } |
| |
| <span class="kw">impl</span><I: ParallelIterator + Debug, U: Debug, F> Debug <span class="kw">for </span>FoldWith<I, U, F> { |
| <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">"FoldWith"</span>) |
| .field(<span class="string">"base"</span>, <span class="kw-2">&</span><span class="self">self</span>.base) |
| .field(<span class="string">"item"</span>, <span class="kw-2">&</span><span class="self">self</span>.item) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><U, I, F> ParallelIterator <span class="kw">for </span>FoldWith<I, U, F> |
| <span class="kw">where |
| </span>I: ParallelIterator, |
| F: Fn(U, I::Item) -> U + Sync + Send, |
| U: Send + Clone, |
| { |
| <span class="kw">type </span>Item = U; |
| |
| <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 = FoldWithConsumer { |
| base: consumer, |
| item: <span class="self">self</span>.item, |
| fold_op: <span class="kw-2">&</span><span class="self">self</span>.fold_op, |
| }; |
| <span class="self">self</span>.base.drive_unindexed(consumer1) |
| } |
| } |
| |
| <span class="kw">struct </span>FoldWithConsumer<<span class="lifetime">'c</span>, C, U, F> { |
| base: C, |
| item: U, |
| fold_op: <span class="kw-2">&</span><span class="lifetime">'c </span>F, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'r</span>, U, T, C, F> Consumer<T> <span class="kw">for </span>FoldWithConsumer<<span class="lifetime">'r</span>, C, U, F> |
| <span class="kw">where |
| </span>C: Consumer<U>, |
| F: Fn(U, T) -> U + Sync, |
| U: Send + Clone, |
| { |
| <span class="kw">type </span>Folder = FoldFolder<<span class="lifetime">'r</span>, C::Folder, U, F>; |
| <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>, <span class="self">Self</span>::Reducer) { |
| <span class="kw">let </span>(left, right, reducer) = <span class="self">self</span>.base.split_at(index); |
| ( |
| FoldWithConsumer { |
| base: left, |
| item: <span class="self">self</span>.item.clone(), |
| ..<span class="self">self |
| </span>}, |
| FoldWithConsumer { |
| base: right, |
| ..<span class="self">self |
| </span>}, |
| reducer, |
| ) |
| } |
| |
| <span class="kw">fn </span>into_folder(<span class="self">self</span>) -> <span class="self">Self</span>::Folder { |
| FoldFolder { |
| base: <span class="self">self</span>.base.into_folder(), |
| item: <span class="self">self</span>.item, |
| fold_op: <span class="self">self</span>.fold_op, |
| } |
| } |
| |
| <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">impl</span><<span class="lifetime">'r</span>, U, T, C, F> UnindexedConsumer<T> <span class="kw">for </span>FoldWithConsumer<<span class="lifetime">'r</span>, C, U, F> |
| <span class="kw">where |
| </span>C: UnindexedConsumer<U>, |
| F: Fn(U, T) -> U + Sync, |
| U: Send + Clone, |
| { |
| <span class="kw">fn </span>split_off_left(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| FoldWithConsumer { |
| base: <span class="self">self</span>.base.split_off_left(), |
| item: <span class="self">self</span>.item.clone(), |
| ..<span class="kw-2">*</span><span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">fn </span>to_reducer(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self</span>::Reducer { |
| <span class="self">self</span>.base.to_reducer() |
| } |
| } |
| </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> |