| <!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/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.28/src/stream/stream/zip.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>zip.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="../../../../futures_util/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="../../../../futures_util/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">crate</span>::stream::{Fuse, StreamExt}; |
| <span class="kw">use </span>core::cmp; |
| <span class="kw">use </span>core::pin::Pin; |
| <span class="kw">use </span>futures_core::stream::{FusedStream, Stream}; |
| <span class="kw">use </span>futures_core::task::{Context, Poll}; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="doccomment">/// Stream for the [`zip`](super::StreamExt::zip) method. |
| </span><span class="attribute">#[derive(Debug)] |
| #[must_use = <span class="string">"streams do nothing unless polled"</span>] |
| </span><span class="kw">pub struct </span>Zip<St1: Stream, St2: Stream> { |
| <span class="attribute">#[pin] |
| </span>stream1: Fuse<St1>, |
| <span class="attribute">#[pin] |
| </span>stream2: Fuse<St2>, |
| queued1: <span class="prelude-ty">Option</span><St1::Item>, |
| queued2: <span class="prelude-ty">Option</span><St2::Item>, |
| } |
| } |
| |
| <span class="kw">impl</span><St1: Stream, St2: Stream> Zip<St1, St2> { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(stream1: St1, stream2: St2) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ stream1: stream1.fuse(), stream2: stream2.fuse(), queued1: <span class="prelude-val">None</span>, queued2: <span class="prelude-val">None </span>} |
| } |
| |
| <span class="doccomment">/// Acquires a reference to the underlying streams that this combinator is |
| /// pulling from. |
| </span><span class="kw">pub fn </span>get_ref(<span class="kw-2">&</span><span class="self">self</span>) -> (<span class="kw-2">&</span>St1, <span class="kw-2">&</span>St2) { |
| (<span class="self">self</span>.stream1.get_ref(), <span class="self">self</span>.stream2.get_ref()) |
| } |
| |
| <span class="doccomment">/// Acquires a mutable reference to the underlying streams that this |
| /// combinator is pulling from. |
| /// |
| /// Note that care must be taken to avoid tampering with the state of the |
| /// stream which may otherwise confuse this combinator. |
| </span><span class="kw">pub fn </span>get_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> (<span class="kw-2">&mut </span>St1, <span class="kw-2">&mut </span>St2) { |
| (<span class="self">self</span>.stream1.get_mut(), <span class="self">self</span>.stream2.get_mut()) |
| } |
| |
| <span class="doccomment">/// Acquires a pinned mutable reference to the underlying streams that this |
| /// combinator is pulling from. |
| /// |
| /// Note that care must be taken to avoid tampering with the state of the |
| /// stream which may otherwise confuse this combinator. |
| </span><span class="kw">pub fn </span>get_pin_mut(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>) -> (Pin<<span class="kw-2">&mut </span>St1>, Pin<<span class="kw-2">&mut </span>St2>) { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| (this.stream1.get_pin_mut(), this.stream2.get_pin_mut()) |
| } |
| |
| <span class="doccomment">/// Consumes this combinator, returning the underlying streams. |
| /// |
| /// Note that this may discard intermediate state of this combinator, so |
| /// care should be taken to avoid losing resources when this is called. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> (St1, St2) { |
| (<span class="self">self</span>.stream1.into_inner(), <span class="self">self</span>.stream2.into_inner()) |
| } |
| } |
| |
| <span class="kw">impl</span><St1, St2> FusedStream <span class="kw">for </span>Zip<St1, St2> |
| <span class="kw">where |
| </span>St1: Stream, |
| St2: Stream, |
| { |
| <span class="kw">fn </span>is_terminated(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.stream1.is_terminated() && <span class="self">self</span>.stream2.is_terminated() |
| } |
| } |
| |
| <span class="kw">impl</span><St1, St2> Stream <span class="kw">for </span>Zip<St1, St2> |
| <span class="kw">where |
| </span>St1: Stream, |
| St2: Stream, |
| { |
| <span class="kw">type </span>Item = (St1::Item, St2::Item); |
| |
| <span class="kw">fn </span>poll_next(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Option</span><<span class="self">Self</span>::Item>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>this = <span class="self">self</span>.project(); |
| |
| <span class="kw">if </span>this.queued1.is_none() { |
| <span class="kw">match </span>this.stream1.as_mut().poll_next(cx) { |
| Poll::Ready(<span class="prelude-val">Some</span>(item1)) => <span class="kw-2">*</span>this.queued1 = <span class="prelude-val">Some</span>(item1), |
| Poll::Ready(<span class="prelude-val">None</span>) | Poll::Pending => {} |
| } |
| } |
| <span class="kw">if </span>this.queued2.is_none() { |
| <span class="kw">match </span>this.stream2.as_mut().poll_next(cx) { |
| Poll::Ready(<span class="prelude-val">Some</span>(item2)) => <span class="kw-2">*</span>this.queued2 = <span class="prelude-val">Some</span>(item2), |
| Poll::Ready(<span class="prelude-val">None</span>) | Poll::Pending => {} |
| } |
| } |
| |
| <span class="kw">if </span>this.queued1.is_some() && this.queued2.is_some() { |
| <span class="kw">let </span>pair = (this.queued1.take().unwrap(), this.queued2.take().unwrap()); |
| Poll::Ready(<span class="prelude-val">Some</span>(pair)) |
| } <span class="kw">else if </span>this.stream1.is_done() || this.stream2.is_done() { |
| Poll::Ready(<span class="prelude-val">None</span>) |
| } <span class="kw">else </span>{ |
| Poll::Pending |
| } |
| } |
| |
| <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>queued1_len = usize::from(<span class="self">self</span>.queued1.is_some()); |
| <span class="kw">let </span>queued2_len = usize::from(<span class="self">self</span>.queued2.is_some()); |
| <span class="kw">let </span>(stream1_lower, stream1_upper) = <span class="self">self</span>.stream1.size_hint(); |
| <span class="kw">let </span>(stream2_lower, stream2_upper) = <span class="self">self</span>.stream2.size_hint(); |
| |
| <span class="kw">let </span>stream1_lower = stream1_lower.saturating_add(queued1_len); |
| <span class="kw">let </span>stream2_lower = stream2_lower.saturating_add(queued2_len); |
| |
| <span class="kw">let </span>lower = cmp::min(stream1_lower, stream2_lower); |
| |
| <span class="kw">let </span>upper = <span class="kw">match </span>(stream1_upper, stream2_upper) { |
| (<span class="prelude-val">Some</span>(x), <span class="prelude-val">Some</span>(y)) => { |
| <span class="kw">let </span>x = x.saturating_add(queued1_len); |
| <span class="kw">let </span>y = y.saturating_add(queued2_len); |
| <span class="prelude-val">Some</span>(cmp::min(x, y)) |
| } |
| (<span class="prelude-val">Some</span>(x), <span class="prelude-val">None</span>) => x.checked_add(queued1_len), |
| (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(y)) => y.checked_add(queued2_len), |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => <span class="prelude-val">None</span>, |
| }; |
| |
| (lower, upper) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="futures_util" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
