| <!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/multizip.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>multizip.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="doccomment">/// `MultiZip` is an iterator that zips up a tuple of parallel iterators to |
| /// produce tuples of their items. |
| /// |
| /// It is created by calling `into_par_iter()` on a tuple of types that |
| /// implement `IntoParallelIterator`, or `par_iter()`/`par_iter_mut()` with |
| /// types that are iterable by reference. |
| /// |
| /// The implementation currently support tuples up to length 12. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use rayon::prelude::*; |
| /// |
| /// // This will iterate `r` by mutable reference, like `par_iter_mut()`, while |
| /// // ranges are all iterated by value like `into_par_iter()`. |
| /// // Note that the zipped iterator is only as long as the shortest input. |
| /// let mut r = vec![0; 3]; |
| /// (&mut r, 1..10, 10..100, 100..1000).into_par_iter() |
| /// .for_each(|(r, x, y, z)| *r = x * y + z); |
| /// |
| /// assert_eq!(&r, &[1 * 10 + 100, 2 * 11 + 101, 3 * 12 + 102]); |
| /// ``` |
| /// |
| /// For a group that should all be iterated by reference, you can use a tuple reference. |
| /// |
| /// ``` |
| /// use rayon::prelude::*; |
| /// |
| /// let xs: Vec<_> = (1..10).collect(); |
| /// let ys: Vec<_> = (10..100).collect(); |
| /// let zs: Vec<_> = (100..1000).collect(); |
| /// |
| /// // Reference each input separately with `IntoParallelIterator`: |
| /// let r1: Vec<_> = (&xs, &ys, &zs).into_par_iter() |
| /// .map(|(x, y, z)| x * y + z) |
| /// .collect(); |
| /// |
| /// // Reference them all together with `IntoParallelRefIterator`: |
| /// let r2: Vec<_> = (xs, ys, zs).par_iter() |
| /// .map(|(x, y, z)| x * y + z) |
| /// .collect(); |
| /// |
| /// assert_eq!(r1, r2); |
| /// ``` |
| /// |
| /// Mutable references to a tuple will work similarly. |
| /// |
| /// ``` |
| /// use rayon::prelude::*; |
| /// |
| /// let mut xs: Vec<_> = (1..4).collect(); |
| /// let mut ys: Vec<_> = (-4..-1).collect(); |
| /// let mut zs = vec![0; 3]; |
| /// |
| /// // Mutably reference each input separately with `IntoParallelIterator`: |
| /// (&mut xs, &mut ys, &mut zs).into_par_iter().for_each(|(x, y, z)| { |
| /// *z += *x + *y; |
| /// std::mem::swap(x, y); |
| /// }); |
| /// |
| /// assert_eq!(xs, (vec![-4, -3, -2])); |
| /// assert_eq!(ys, (vec![1, 2, 3])); |
| /// assert_eq!(zs, (vec![-3, -1, 1])); |
| /// |
| /// // Mutably reference them all together with `IntoParallelRefMutIterator`: |
| /// let mut tuple = (xs, ys, zs); |
| /// tuple.par_iter_mut().for_each(|(x, y, z)| { |
| /// *z += *x + *y; |
| /// std::mem::swap(x, y); |
| /// }); |
| /// |
| /// assert_eq!(tuple, (vec![1, 2, 3], vec![-4, -3, -2], vec![-6, -2, 2])); |
| /// ``` |
| </span><span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>MultiZip<T> { |
| tuple: T, |
| } |
| |
| <span class="comment">// These macros greedily consume 4 or 2 items first to achieve log2 nesting depth. |
| // For example, 5 => 4,1 => (2,2),1. |
| // |
| // The tuples go up to 12, so we might want to greedily consume 8 too, but |
| // the depth works out the same if we let that expand on the right: |
| // 9 => 4,5 => (2,2),(4,1) => (2,2),((2,2),1) |
| // 12 => 4,8 => (2,2),(4,4) => (2,2),((2,2),(2,2)) |
| // |
| // But if we ever increase to 13, we would want to split 8,5 rather than 4,9. |
| |
| </span><span class="macro">macro_rules! </span>reduce { |
| (<span class="macro-nonterminal">$a</span>:expr, <span class="macro-nonterminal">$b</span>:expr, <span class="macro-nonterminal">$c</span>:expr, <span class="macro-nonterminal">$d</span>:expr, $( <span class="macro-nonterminal">$x</span>:expr ),+ => <span class="macro-nonterminal">$</span><span class="kw">fn</span>:<span class="macro-nonterminal">path</span>) => { |
| <span class="macro">reduce!</span>(<span class="macro">reduce!</span>(<span class="macro-nonterminal">$a</span>, <span class="macro-nonterminal">$b</span>, <span class="macro-nonterminal">$c</span>, <span class="macro-nonterminal">$d </span>=> <span class="macro-nonterminal">$</span><span class="kw">fn</span>), |
| <span class="macro">reduce!</span>($( <span class="macro-nonterminal">$x </span>),+ => <span class="macro-nonterminal">$</span><span class="kw">fn</span>) |
| => <span class="macro-nonterminal">$</span><span class="kw">fn</span>) |
| }; |
| (<span class="macro-nonterminal">$a</span>:expr, <span class="macro-nonterminal">$b</span>:expr, $( <span class="macro-nonterminal">$x</span>:expr ),+ => <span class="macro-nonterminal">$</span><span class="kw">fn</span>:<span class="macro-nonterminal">path</span>) => { |
| <span class="macro">reduce!</span>(<span class="macro">reduce!</span>(<span class="macro-nonterminal">$a</span>, <span class="macro-nonterminal">$b </span>=> <span class="macro-nonterminal">$</span><span class="kw">fn</span>), |
| <span class="macro">reduce!</span>($( <span class="macro-nonterminal">$x </span>),+ => <span class="macro-nonterminal">$</span><span class="kw">fn</span>) |
| => <span class="macro-nonterminal">$</span><span class="kw">fn</span>) |
| }; |
| (<span class="macro-nonterminal">$a</span>:expr, <span class="macro-nonterminal">$b</span>:expr => <span class="macro-nonterminal">$</span><span class="kw">fn</span>:<span class="macro-nonterminal">path</span>) => { <span class="macro-nonterminal">$</span><span class="kw">fn</span>(<span class="macro-nonterminal">$a</span>, <span class="macro-nonterminal">$b</span>) }; |
| (<span class="macro-nonterminal">$a</span>:expr => <span class="macro-nonterminal">$</span><span class="kw">fn</span>:<span class="macro-nonterminal">path</span>) => { <span class="macro-nonterminal">$a </span>}; |
| } |
| |
| <span class="macro">macro_rules! </span>nest { |
| (<span class="macro-nonterminal">$A</span>:tt, <span class="macro-nonterminal">$B</span>:tt, <span class="macro-nonterminal">$C</span>:tt, <span class="macro-nonterminal">$D</span>:tt, $( <span class="macro-nonterminal">$X</span>:tt ),+) => { |
| (<span class="macro">nest!</span>(<span class="macro-nonterminal">$A</span>, <span class="macro-nonterminal">$B</span>, <span class="macro-nonterminal">$C</span>, <span class="macro-nonterminal">$D</span>), <span class="macro">nest!</span>($( <span class="macro-nonterminal">$X </span>),+)) |
| }; |
| (<span class="macro-nonterminal">$A</span>:tt, <span class="macro-nonterminal">$B</span>:tt, $( <span class="macro-nonterminal">$X</span>:tt ),+) => { |
| ((<span class="macro-nonterminal">$A</span>, <span class="macro-nonterminal">$B</span>), <span class="macro">nest!</span>($( <span class="macro-nonterminal">$X </span>),+)) |
| }; |
| (<span class="macro-nonterminal">$A</span>:tt, <span class="macro-nonterminal">$B</span>:tt) => { (<span class="macro-nonterminal">$A</span>, <span class="macro-nonterminal">$B</span>) }; |
| (<span class="macro-nonterminal">$A</span>:tt) => { <span class="macro-nonterminal">$A </span>}; |
| } |
| |
| <span class="macro">macro_rules! </span>flatten { |
| ($( <span class="macro-nonterminal">$T</span>:ident ),+) => {{ |
| <span class="attribute">#[allow(non_snake_case)] |
| </span><span class="kw">fn </span>flatten<$( <span class="macro-nonterminal">$T </span>),+>(<span class="macro">nest!</span>($( <span class="macro-nonterminal">$T </span>),+) : <span class="macro">nest!</span>($( <span class="macro-nonterminal">$T </span>),+)) -> ($( <span class="macro-nonterminal">$T</span>, )+) { |
| ($( <span class="macro-nonterminal">$T</span>, )+) |
| } |
| flatten |
| }}; |
| } |
| |
| <span class="macro">macro_rules! </span>multizip_impls { |
| ($( |
| <span class="macro-nonterminal">$Tuple</span>:ident { |
| $((<span class="macro-nonterminal">$idx</span>:tt) -> <span class="macro-nonterminal">$T</span>:ident)+ |
| } |
| )+) => { |
| $( |
| <span class="kw">impl</span><$( <span class="macro-nonterminal">$T</span>, )+> IntoParallelIterator <span class="kw">for </span>($( <span class="macro-nonterminal">$T</span>, )+) |
| <span class="kw">where |
| </span>$( |
| <span class="macro-nonterminal">$T</span>: IntoParallelIterator, |
| <span class="macro-nonterminal">$T::Iter</span>: IndexedParallelIterator, |
| )+ |
| { |
| <span class="kw">type </span>Item = ($( <span class="macro-nonterminal">$T::Item</span>, )+); |
| <span class="kw">type </span>Iter = MultiZip<($( <span class="macro-nonterminal">$T::Iter</span>, )+)>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| MultiZip { |
| tuple: ( $( <span class="self">self</span>.<span class="macro-nonterminal">$idx</span>.into_par_iter(), )+ ), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, $( <span class="macro-nonterminal">$T</span>, )+> IntoParallelIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>($( <span class="macro-nonterminal">$T</span>, )+) |
| <span class="kw">where |
| </span>$( |
| <span class="macro-nonterminal">$T</span>: IntoParallelRefIterator<<span class="lifetime">'a</span>>, |
| <span class="macro-nonterminal">$T::Iter</span>: IndexedParallelIterator, |
| )+ |
| { |
| <span class="kw">type </span>Item = ($( <span class="macro-nonterminal">$T::Item</span>, )+); |
| <span class="kw">type </span>Iter = MultiZip<($( <span class="macro-nonterminal">$T::Iter</span>, )+)>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| MultiZip { |
| tuple: ( $( <span class="self">self</span>.<span class="macro-nonterminal">$idx</span>.par_iter(), )+ ), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, $( <span class="macro-nonterminal">$T</span>, )+> IntoParallelIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>($( <span class="macro-nonterminal">$T</span>, )+) |
| <span class="kw">where |
| </span>$( |
| <span class="macro-nonterminal">$T</span>: IntoParallelRefMutIterator<<span class="lifetime">'a</span>>, |
| <span class="macro-nonterminal">$T::Iter</span>: IndexedParallelIterator, |
| )+ |
| { |
| <span class="kw">type </span>Item = ($( <span class="macro-nonterminal">$T::Item</span>, )+); |
| <span class="kw">type </span>Iter = MultiZip<($( <span class="macro-nonterminal">$T::Iter</span>, )+)>; |
| |
| <span class="kw">fn </span>into_par_iter(<span class="self">self</span>) -> <span class="self">Self</span>::Iter { |
| MultiZip { |
| tuple: ( $( <span class="self">self</span>.<span class="macro-nonterminal">$idx</span>.par_iter_mut(), )+ ), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><$( <span class="macro-nonterminal">$T</span>, )+> ParallelIterator <span class="kw">for </span>MultiZip<($( <span class="macro-nonterminal">$T</span>, )+)> |
| <span class="kw">where |
| </span>$( <span class="macro-nonterminal">$T</span>: IndexedParallelIterator, )+ |
| { |
| <span class="kw">type </span>Item = ($( <span class="macro-nonterminal">$T::Item</span>, )+); |
| |
| <span class="kw">fn </span>drive_unindexed<CONSUMER>(<span class="self">self</span>, consumer: CONSUMER) -> CONSUMER::Result |
| <span class="kw">where |
| </span>CONSUMER: UnindexedConsumer<<span class="self">Self</span>::Item>, |
| { |
| <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="kw">impl</span><$( <span class="macro-nonterminal">$T</span>, )+> IndexedParallelIterator <span class="kw">for </span>MultiZip<($( <span class="macro-nonterminal">$T</span>, )+)> |
| <span class="kw">where |
| </span>$( <span class="macro-nonterminal">$T</span>: IndexedParallelIterator, )+ |
| { |
| <span class="kw">fn </span>drive<CONSUMER>(<span class="self">self</span>, consumer: CONSUMER) -> CONSUMER::Result |
| <span class="kw">where |
| </span>CONSUMER: Consumer<<span class="self">Self</span>::Item>, |
| { |
| <span class="macro">reduce!</span>($( <span class="self">self</span>.tuple.<span class="macro-nonterminal">$idx </span>),+ => IndexedParallelIterator::zip) |
| .map(<span class="macro">flatten!</span>($( <span class="macro-nonterminal">$T </span>),+)) |
| .drive(consumer) |
| } |
| |
| <span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="macro">reduce!</span>($( <span class="self">self</span>.tuple.<span class="macro-nonterminal">$idx</span>.len() ),+ => Ord::min) |
| } |
| |
| <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">reduce!</span>($( <span class="self">self</span>.tuple.<span class="macro-nonterminal">$idx </span>),+ => IndexedParallelIterator::zip) |
| .map(<span class="macro">flatten!</span>($( <span class="macro-nonterminal">$T </span>),+)) |
| .with_producer(callback) |
| } |
| } |
| )+ |
| } |
| } |
| |
| <span class="macro">multizip_impls! </span>{ |
| Tuple1 { |
| (<span class="number">0</span>) -> A |
| } |
| Tuple2 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| } |
| Tuple3 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| } |
| Tuple4 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| } |
| Tuple5 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| (<span class="number">4</span>) -> E |
| } |
| Tuple6 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| (<span class="number">4</span>) -> E |
| (<span class="number">5</span>) -> F |
| } |
| Tuple7 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| (<span class="number">4</span>) -> E |
| (<span class="number">5</span>) -> F |
| (<span class="number">6</span>) -> G |
| } |
| Tuple8 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| (<span class="number">4</span>) -> E |
| (<span class="number">5</span>) -> F |
| (<span class="number">6</span>) -> G |
| (<span class="number">7</span>) -> H |
| } |
| Tuple9 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| (<span class="number">4</span>) -> E |
| (<span class="number">5</span>) -> F |
| (<span class="number">6</span>) -> G |
| (<span class="number">7</span>) -> H |
| (<span class="number">8</span>) -> I |
| } |
| Tuple10 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| (<span class="number">4</span>) -> E |
| (<span class="number">5</span>) -> F |
| (<span class="number">6</span>) -> G |
| (<span class="number">7</span>) -> H |
| (<span class="number">8</span>) -> I |
| (<span class="number">9</span>) -> J |
| } |
| Tuple11 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| (<span class="number">4</span>) -> E |
| (<span class="number">5</span>) -> F |
| (<span class="number">6</span>) -> G |
| (<span class="number">7</span>) -> H |
| (<span class="number">8</span>) -> I |
| (<span class="number">9</span>) -> J |
| (<span class="number">10</span>) -> K |
| } |
| Tuple12 { |
| (<span class="number">0</span>) -> A |
| (<span class="number">1</span>) -> B |
| (<span class="number">2</span>) -> C |
| (<span class="number">3</span>) -> D |
| (<span class="number">4</span>) -> E |
| (<span class="number">5</span>) -> F |
| (<span class="number">6</span>) -> G |
| (<span class="number">7</span>) -> H |
| (<span class="number">8</span>) -> I |
| (<span class="number">9</span>) -> J |
| (<span class="number">10</span>) -> K |
| (<span class="number">11</span>) -> L |
| } |
| } |
| </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> |