| <!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/interleave.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>interleave.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="kw">use </span>std::iter::Fuse; |
| |
| <span class="doccomment">/// `Interleave` is an iterator that interleaves elements of iterators |
| /// `i` and `j` in one continuous iterator. This struct is created by |
| /// the [`interleave()`] method on [`IndexedParallelIterator`] |
| /// |
| /// [`interleave()`]: trait.IndexedParallelIterator.html#method.interleave |
| /// [`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>Interleave<I, J> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| J: IndexedParallelIterator<Item = I::Item>, |
| { |
| i: I, |
| j: J, |
| } |
| |
| <span class="kw">impl</span><I, J> Interleave<I, J> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| J: IndexedParallelIterator<Item = I::Item>, |
| { |
| <span class="doccomment">/// Creates a new `Interleave` iterator |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(i: I, j: J) -> <span class="self">Self </span>{ |
| Interleave { i, j } |
| } |
| } |
| |
| <span class="kw">impl</span><I, J> ParallelIterator <span class="kw">for </span>Interleave<I, J> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| J: IndexedParallelIterator<Item = I::Item>, |
| { |
| <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: Consumer<I::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, J> IndexedParallelIterator <span class="kw">for </span>Interleave<I, J> |
| <span class="kw">where |
| </span>I: IndexedParallelIterator, |
| J: IndexedParallelIterator<Item = I::Item>, |
| { |
| <span class="kw">fn </span>drive<C>(<span class="self">self</span>, consumer: C) -> C::Result |
| <span class="kw">where |
| </span>C: Consumer<<span class="self">Self</span>::Item>, |
| { |
| 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>.i.len().checked_add(<span class="self">self</span>.j.len()).expect(<span class="string">"overflow"</span>) |
| } |
| |
| <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">let </span>(i_len, j_len) = (<span class="self">self</span>.i.len(), <span class="self">self</span>.j.len()); |
| <span class="kw">return </span><span class="self">self</span>.i.with_producer(CallbackI { |
| callback, |
| i_len, |
| j_len, |
| i_next: <span class="bool-val">false</span>, |
| j: <span class="self">self</span>.j, |
| }); |
| |
| <span class="kw">struct </span>CallbackI<CB, J> { |
| callback: CB, |
| i_len: usize, |
| j_len: usize, |
| i_next: bool, |
| j: J, |
| } |
| |
| <span class="kw">impl</span><CB, J> ProducerCallback<J::Item> <span class="kw">for </span>CallbackI<CB, J> |
| <span class="kw">where |
| </span>J: IndexedParallelIterator, |
| CB: ProducerCallback<J::Item>, |
| { |
| <span class="kw">type </span>Output = CB::Output; |
| |
| <span class="kw">fn </span>callback<I>(<span class="self">self</span>, i_producer: I) -> <span class="self">Self</span>::Output |
| <span class="kw">where |
| </span>I: Producer<Item = J::Item>, |
| { |
| <span class="self">self</span>.j.with_producer(CallbackJ { |
| i_producer, |
| i_len: <span class="self">self</span>.i_len, |
| j_len: <span class="self">self</span>.j_len, |
| i_next: <span class="self">self</span>.i_next, |
| callback: <span class="self">self</span>.callback, |
| }) |
| } |
| } |
| |
| <span class="kw">struct </span>CallbackJ<CB, I> { |
| callback: CB, |
| i_len: usize, |
| j_len: usize, |
| i_next: bool, |
| i_producer: I, |
| } |
| |
| <span class="kw">impl</span><CB, I> ProducerCallback<I::Item> <span class="kw">for </span>CallbackJ<CB, I> |
| <span class="kw">where |
| </span>I: Producer, |
| CB: ProducerCallback<I::Item>, |
| { |
| <span class="kw">type </span>Output = CB::Output; |
| |
| <span class="kw">fn </span>callback<J>(<span class="self">self</span>, j_producer: J) -> <span class="self">Self</span>::Output |
| <span class="kw">where |
| </span>J: Producer<Item = I::Item>, |
| { |
| <span class="kw">let </span>producer = InterleaveProducer::new( |
| <span class="self">self</span>.i_producer, |
| j_producer, |
| <span class="self">self</span>.i_len, |
| <span class="self">self</span>.j_len, |
| <span class="self">self</span>.i_next, |
| ); |
| <span class="self">self</span>.callback.callback(producer) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">struct </span>InterleaveProducer<I, J> |
| <span class="kw">where |
| </span>I: Producer, |
| J: Producer<Item = I::Item>, |
| { |
| i: I, |
| j: J, |
| i_len: usize, |
| j_len: usize, |
| i_next: bool, |
| } |
| |
| <span class="kw">impl</span><I, J> InterleaveProducer<I, J> |
| <span class="kw">where |
| </span>I: Producer, |
| J: Producer<Item = I::Item>, |
| { |
| <span class="kw">fn </span>new(i: I, j: J, i_len: usize, j_len: usize, i_next: bool) -> InterleaveProducer<I, J> { |
| InterleaveProducer { |
| i, |
| j, |
| i_len, |
| j_len, |
| i_next, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><I, J> Producer <span class="kw">for </span>InterleaveProducer<I, J> |
| <span class="kw">where |
| </span>I: Producer, |
| J: Producer<Item = I::Item>, |
| { |
| <span class="kw">type </span>Item = I::Item; |
| <span class="kw">type </span>IntoIter = InterleaveSeq<I::IntoIter, J::IntoIter>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| InterleaveSeq { |
| i: <span class="self">self</span>.i.into_iter().fuse(), |
| j: <span class="self">self</span>.j.into_iter().fuse(), |
| i_next: <span class="self">self</span>.i_next, |
| } |
| } |
| |
| <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>.i.min_len(), <span class="self">self</span>.j.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>.i.max_len(), <span class="self">self</span>.j.max_len()) |
| } |
| |
| <span class="doccomment">/// We know 0 < index <= self.i_len + self.j_len |
| /// |
| /// Find a, b satisfying: |
| /// |
| /// (1) 0 < a <= self.i_len |
| /// (2) 0 < b <= self.j_len |
| /// (3) a + b == index |
| /// |
| /// For even splits, set a = b = index/2. |
| /// For odd splits, set a = (index/2)+1, b = index/2, if `i` |
| /// should yield the next element, otherwise, if `j` should yield |
| /// the next element, set a = index/2 and b = (index/2)+1 |
| </span><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="attribute">#[inline] |
| </span><span class="kw">fn </span>odd_offset(flag: bool) -> usize { |
| (!flag) <span class="kw">as </span>usize |
| } |
| |
| <span class="kw">let </span>even = index % <span class="number">2 </span>== <span class="number">0</span>; |
| <span class="kw">let </span>idx = index >> <span class="number">1</span>; |
| |
| <span class="comment">// desired split |
| </span><span class="kw">let </span>(i_idx, j_idx) = ( |
| idx + odd_offset(even || <span class="self">self</span>.i_next), |
| idx + odd_offset(even || !<span class="self">self</span>.i_next), |
| ); |
| |
| <span class="kw">let </span>(i_split, j_split) = <span class="kw">if </span><span class="self">self</span>.i_len >= i_idx && <span class="self">self</span>.j_len >= j_idx { |
| (i_idx, j_idx) |
| } <span class="kw">else if </span><span class="self">self</span>.i_len >= i_idx { |
| <span class="comment">// j too short |
| </span>(index - <span class="self">self</span>.j_len, <span class="self">self</span>.j_len) |
| } <span class="kw">else </span>{ |
| <span class="comment">// i too short |
| </span>(<span class="self">self</span>.i_len, index - <span class="self">self</span>.i_len) |
| }; |
| |
| <span class="kw">let </span>trailing_i_next = even == <span class="self">self</span>.i_next; |
| <span class="kw">let </span>(i_left, i_right) = <span class="self">self</span>.i.split_at(i_split); |
| <span class="kw">let </span>(j_left, j_right) = <span class="self">self</span>.j.split_at(j_split); |
| |
| ( |
| InterleaveProducer::new(i_left, j_left, i_split, j_split, <span class="self">self</span>.i_next), |
| InterleaveProducer::new( |
| i_right, |
| j_right, |
| <span class="self">self</span>.i_len - i_split, |
| <span class="self">self</span>.j_len - j_split, |
| trailing_i_next, |
| ), |
| ) |
| } |
| } |
| |
| <span class="doccomment">/// Wrapper for Interleave to implement DoubleEndedIterator and |
| /// ExactSizeIterator. |
| /// |
| /// This iterator is fused. |
| </span><span class="kw">struct </span>InterleaveSeq<I, J> { |
| i: Fuse<I>, |
| j: Fuse<J>, |
| |
| <span class="doccomment">/// Flag to control which iterator should provide the next element. When |
| /// `false` then `i` produces the next element, otherwise `j` produces the |
| /// next element. |
| </span>i_next: bool, |
| } |
| |
| <span class="doccomment">/// Iterator implementation for InterleaveSeq. This implementation is |
| /// taken more or less verbatim from itertools. It is replicated here |
| /// (instead of calling itertools directly), because we also need to |
| /// implement `DoubledEndedIterator` and `ExactSizeIterator`. |
| </span><span class="kw">impl</span><I, J> Iterator <span class="kw">for </span>InterleaveSeq<I, J> |
| <span class="kw">where |
| </span>I: Iterator, |
| J: Iterator<Item = I::Item>, |
| { |
| <span class="kw">type </span>Item = I::Item; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.i_next = !<span class="self">self</span>.i_next; |
| <span class="kw">if </span><span class="self">self</span>.i_next { |
| <span class="kw">match </span><span class="self">self</span>.i.next() { |
| <span class="prelude-val">None </span>=> <span class="self">self</span>.j.next(), |
| r => r, |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">match </span><span class="self">self</span>.j.next() { |
| <span class="prelude-val">None </span>=> <span class="self">self</span>.i.next(), |
| r => r, |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="kw">let </span>(ih, jh) = (<span class="self">self</span>.i.size_hint(), <span class="self">self</span>.j.size_hint()); |
| <span class="kw">let </span>min = ih.<span class="number">0</span>.saturating_add(jh.<span class="number">0</span>); |
| <span class="kw">let </span>max = <span class="kw">match </span>(ih.<span class="number">1</span>, jh.<span class="number">1</span>) { |
| (<span class="prelude-val">Some</span>(x), <span class="prelude-val">Some</span>(y)) => x.checked_add(y), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| }; |
| (min, max) |
| } |
| } |
| |
| <span class="comment">// The implementation for DoubleEndedIterator requires |
| // ExactSizeIterator to provide `next_back()`. The last element will |
| // come from the iterator that runs out last (ie has the most elements |
| // in it). If the iterators have the same number of elements, then the |
| // last iterator will provide the last element. |
| </span><span class="kw">impl</span><I, J> DoubleEndedIterator <span class="kw">for </span>InterleaveSeq<I, J> |
| <span class="kw">where |
| </span>I: DoubleEndedIterator + ExactSizeIterator, |
| J: DoubleEndedIterator<Item = I::Item> + ExactSizeIterator<Item = I::Item>, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><I::Item> { |
| <span class="kw">match </span><span class="self">self</span>.i.len().cmp(<span class="kw-2">&</span><span class="self">self</span>.j.len()) { |
| Ordering::Less => <span class="self">self</span>.j.next_back(), |
| Ordering::Equal => { |
| <span class="kw">if </span><span class="self">self</span>.i_next { |
| <span class="self">self</span>.i.next_back() |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.j.next_back() |
| } |
| } |
| Ordering::Greater => <span class="self">self</span>.i.next_back(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><I, J> ExactSizeIterator <span class="kw">for </span>InterleaveSeq<I, J> |
| <span class="kw">where |
| </span>I: ExactSizeIterator, |
| J: ExactSizeIterator<Item = I::Item>, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.i.len() + <span class="self">self</span>.j.len() |
| } |
| } |
| </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> |