| <!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/select_all.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>select_all.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="doccomment">//! An unbounded set of streams |
| |
| </span><span class="kw">use </span>core::fmt::{<span class="self">self</span>, Debug}; |
| <span class="kw">use </span>core::iter::FromIterator; |
| <span class="kw">use </span>core::pin::Pin; |
| |
| <span class="kw">use </span>futures_core::ready; |
| <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><span class="kw">super</span>::assert_stream; |
| <span class="kw">use </span><span class="kw">crate</span>::stream::{futures_unordered, FuturesUnordered, StreamExt, StreamFuture}; |
| |
| <span class="doccomment">/// An unbounded set of streams |
| /// |
| /// This "combinator" provides the ability to maintain a set of streams |
| /// and drive them all to completion. |
| /// |
| /// Streams are pushed into this set and their realized values are |
| /// yielded as they become ready. Streams will only be polled when they |
| /// generate notifications. This allows to coordinate a large number of streams. |
| /// |
| /// Note that you can create a ready-made `SelectAll` via the |
| /// `select_all` function in the `stream` module, or you can start with an |
| /// empty set with the `SelectAll::new` constructor. |
| </span><span class="attribute">#[must_use = <span class="string">"streams do nothing unless polled"</span>] |
| </span><span class="kw">pub struct </span>SelectAll<St> { |
| inner: FuturesUnordered<StreamFuture<St>>, |
| } |
| |
| <span class="kw">impl</span><St: Debug> Debug <span class="kw">for </span>SelectAll<St> { |
| <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 { |
| <span class="macro">write!</span>(f, <span class="string">"SelectAll {{ ... }}"</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> SelectAll<St> { |
| <span class="doccomment">/// Constructs a new, empty `SelectAll` |
| /// |
| /// The returned `SelectAll` does not contain any streams and, in this |
| /// state, `SelectAll::poll` will return `Poll::Ready(None)`. |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ inner: FuturesUnordered::new() } |
| } |
| |
| <span class="doccomment">/// Returns the number of streams contained in the set. |
| /// |
| /// This represents the total number of in-flight streams. |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.inner.len() |
| } |
| |
| <span class="doccomment">/// Returns `true` if the set contains no streams |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.inner.is_empty() |
| } |
| |
| <span class="doccomment">/// Push a stream into the set. |
| /// |
| /// This function submits the given stream to the set for managing. This |
| /// function will not call `poll` on the submitted stream. The caller must |
| /// ensure that `SelectAll::poll` is called in order to receive task |
| /// notifications. |
| </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, stream: St) { |
| <span class="self">self</span>.inner.push(stream.into_future()); |
| } |
| |
| <span class="doccomment">/// Returns an iterator that allows inspecting each stream in the set. |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> Iter<<span class="lifetime">'_</span>, St> { |
| Iter(<span class="self">self</span>.inner.iter()) |
| } |
| |
| <span class="doccomment">/// Returns an iterator that allows modifying each stream in the set. |
| </span><span class="kw">pub fn </span>iter_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> IterMut<<span class="lifetime">'_</span>, St> { |
| IterMut(<span class="self">self</span>.inner.iter_mut()) |
| } |
| |
| <span class="doccomment">/// Clears the set, removing all streams. |
| </span><span class="kw">pub fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.inner.clear() |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> Default <span class="kw">for </span>SelectAll<St> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::new() |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> Stream <span class="kw">for </span>SelectAll<St> { |
| <span class="kw">type </span>Item = St::Item; |
| |
| <span class="kw">fn </span>poll_next(<span class="kw-2">mut </span><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">loop </span>{ |
| <span class="kw">match </span><span class="macro">ready!</span>(<span class="self">self</span>.inner.poll_next_unpin(cx)) { |
| <span class="prelude-val">Some</span>((<span class="prelude-val">Some</span>(item), remaining)) => { |
| <span class="self">self</span>.push(remaining); |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(item)); |
| } |
| <span class="prelude-val">Some</span>((<span class="prelude-val">None</span>, <span class="kw">_</span>)) => { |
| <span class="comment">// `FuturesUnordered` thinks it isn't terminated |
| // because it yielded a Some. |
| // We do not return, but poll `FuturesUnordered` |
| // in the next loop iteration. |
| </span>} |
| <span class="prelude-val">None </span>=> <span class="kw">return </span>Poll::Ready(<span class="prelude-val">None</span>), |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> FusedStream <span class="kw">for </span>SelectAll<St> { |
| <span class="kw">fn </span>is_terminated(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.inner.is_terminated() |
| } |
| } |
| |
| <span class="doccomment">/// Convert a list of streams into a `Stream` of results from the streams. |
| /// |
| /// This essentially takes a list of streams (e.g. a vector, an iterator, etc.) |
| /// and bundles them together into a single stream. |
| /// The stream will yield items as they become available on the underlying |
| /// streams internally, in the order they become available. |
| /// |
| /// Note that the returned set can also be used to dynamically push more |
| /// streams into the set as they become available. |
| /// |
| /// This function is only available when the `std` or `alloc` feature of this |
| /// library is activated, and it is activated by default. |
| </span><span class="kw">pub fn </span>select_all<I>(streams: I) -> SelectAll<I::Item> |
| <span class="kw">where |
| </span>I: IntoIterator, |
| I::Item: Stream + Unpin, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>set = SelectAll::new(); |
| |
| <span class="kw">for </span>stream <span class="kw">in </span>streams { |
| set.push(stream); |
| } |
| |
| assert_stream::<<I::Item <span class="kw">as </span>Stream>::Item, <span class="kw">_</span>>(set) |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> FromIterator<St> <span class="kw">for </span>SelectAll<St> { |
| <span class="kw">fn </span>from_iter<T: IntoIterator<Item = St>>(iter: T) -> <span class="self">Self </span>{ |
| select_all(iter) |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> Extend<St> <span class="kw">for </span>SelectAll<St> { |
| <span class="kw">fn </span>extend<T: IntoIterator<Item = St>>(<span class="kw-2">&mut </span><span class="self">self</span>, iter: T) { |
| <span class="kw">for </span>st <span class="kw">in </span>iter { |
| <span class="self">self</span>.push(st) |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> IntoIterator <span class="kw">for </span>SelectAll<St> { |
| <span class="kw">type </span>Item = St; |
| <span class="kw">type </span>IntoIter = IntoIter<St>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| IntoIter(<span class="self">self</span>.inner.into_iter()) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, St: Stream + Unpin> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span>SelectAll<St> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>St; |
| <span class="kw">type </span>IntoIter = Iter<<span class="lifetime">'a</span>, St>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.iter() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, St: Stream + Unpin> IntoIterator <span class="kw">for </span><span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>SelectAll<St> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>St; |
| <span class="kw">type </span>IntoIter = IterMut<<span class="lifetime">'a</span>, St>; |
| |
| <span class="kw">fn </span>into_iter(<span class="self">self</span>) -> <span class="self">Self</span>::IntoIter { |
| <span class="self">self</span>.iter_mut() |
| } |
| } |
| |
| <span class="doccomment">/// Immutable iterator over all streams in the unordered set. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>Iter<<span class="lifetime">'a</span>, St: Unpin>(futures_unordered::Iter<<span class="lifetime">'a</span>, StreamFuture<St>>); |
| |
| <span class="doccomment">/// Mutable iterator over all streams in the unordered set. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>IterMut<<span class="lifetime">'a</span>, St: Unpin>(futures_unordered::IterMut<<span class="lifetime">'a</span>, StreamFuture<St>>); |
| |
| <span class="doccomment">/// Owned iterator over all streams in the unordered set. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>IntoIter<St: Unpin>(futures_unordered::IntoIter<StreamFuture<St>>); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, St: Stream + Unpin> Iterator <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, St> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>St; |
| |
| <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="kw">let </span>st = <span class="self">self</span>.<span class="number">0</span>.next()<span class="question-mark">?</span>; |
| <span class="kw">let </span>next = st.get_ref(); |
| <span class="comment">// This should always be true because FuturesUnordered removes completed futures. |
| </span><span class="macro">debug_assert!</span>(next.is_some()); |
| next |
| } |
| |
| <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="self">self</span>.<span class="number">0</span>.size_hint() |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> ExactSizeIterator <span class="kw">for </span>Iter<<span class="lifetime">'_</span>, St> {} |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, St: Stream + Unpin> Iterator <span class="kw">for </span>IterMut<<span class="lifetime">'a</span>, St> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>St; |
| |
| <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="kw">let </span>st = <span class="self">self</span>.<span class="number">0</span>.next()<span class="question-mark">?</span>; |
| <span class="kw">let </span>next = st.get_mut(); |
| <span class="comment">// This should always be true because FuturesUnordered removes completed futures. |
| </span><span class="macro">debug_assert!</span>(next.is_some()); |
| next |
| } |
| |
| <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="self">self</span>.<span class="number">0</span>.size_hint() |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> ExactSizeIterator <span class="kw">for </span>IterMut<<span class="lifetime">'_</span>, St> {} |
| |
| <span class="kw">impl</span><St: Stream + Unpin> Iterator <span class="kw">for </span>IntoIter<St> { |
| <span class="kw">type </span>Item = St; |
| |
| <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="kw">let </span>st = <span class="self">self</span>.<span class="number">0</span>.next()<span class="question-mark">?</span>; |
| <span class="kw">let </span>next = st.into_inner(); |
| <span class="comment">// This should always be true because FuturesUnordered removes completed futures. |
| </span><span class="macro">debug_assert!</span>(next.is_some()); |
| next |
| } |
| |
| <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="self">self</span>.<span class="number">0</span>.size_hint() |
| } |
| } |
| |
| <span class="kw">impl</span><St: Stream + Unpin> ExactSizeIterator <span class="kw">for </span>IntoIter<St> {} |
| </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> |
