| <!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/future/either.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>either.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>core::pin::Pin; |
| <span class="kw">use </span>core::task::{Context, Poll}; |
| <span class="kw">use </span>futures_core::future::{FusedFuture, Future}; |
| <span class="kw">use </span>futures_core::stream::{FusedStream, Stream}; |
| <span class="attribute">#[cfg(feature = <span class="string">"sink"</span>)] |
| </span><span class="kw">use </span>futures_sink::Sink; |
| |
| <span class="doccomment">/// Combines two different futures, streams, or sinks having the same associated types into a single type. |
| /// |
| /// This is useful when conditionally choosing between two distinct future types: |
| /// |
| /// ```rust |
| /// use futures::future::Either; |
| /// |
| /// # futures::executor::block_on(async { |
| /// let cond = true; |
| /// |
| /// let fut = if cond { |
| /// Either::Left(async move { 12 }) |
| /// } else { |
| /// Either::Right(async move { 44 }) |
| /// }; |
| /// |
| /// assert_eq!(fut.await, 12); |
| /// # }) |
| /// ``` |
| </span><span class="attribute">#[derive(Debug, Clone)] |
| </span><span class="kw">pub enum </span>Either<A, B> { |
| <span class="doccomment">/// First branch of the type |
| </span>Left(<span class="comment">/* #[pin] */ </span>A), |
| <span class="doccomment">/// Second branch of the type |
| </span>Right(<span class="comment">/* #[pin] */ </span>B), |
| } |
| |
| <span class="kw">impl</span><A, B> Either<A, B> { |
| <span class="doccomment">/// Convert `Pin<&Either<A, B>>` to `Either<Pin<&A>, Pin<&B>>`, |
| /// pinned projections of the inner variants. |
| </span><span class="kw">pub fn </span>as_pin_ref(<span class="self">self</span>: Pin<<span class="kw-2">&</span><span class="self">Self</span>>) -> Either<Pin<<span class="kw-2">&</span>A>, Pin<<span class="kw-2">&</span>B>> { |
| <span class="comment">// SAFETY: We can use `new_unchecked` because the `inner` parts are |
| // guaranteed to be pinned, as they come from `self` which is pinned. |
| </span><span class="kw">unsafe </span>{ |
| <span class="kw">match </span><span class="kw-2">*</span>Pin::get_ref(<span class="self">self</span>) { |
| Either::Left(<span class="kw-2">ref </span>inner) => Either::Left(Pin::new_unchecked(inner)), |
| Either::Right(<span class="kw-2">ref </span>inner) => Either::Right(Pin::new_unchecked(inner)), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Convert `Pin<&mut Either<A, B>>` to `Either<Pin<&mut A>, Pin<&mut B>>`, |
| /// pinned projections of the inner variants. |
| </span><span class="kw">pub fn </span>as_pin_mut(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>) -> Either<Pin<<span class="kw-2">&mut </span>A>, Pin<<span class="kw-2">&mut </span>B>> { |
| <span class="comment">// SAFETY: `get_unchecked_mut` is fine because we don't move anything. |
| // We can use `new_unchecked` because the `inner` parts are guaranteed |
| // to be pinned, as they come from `self` which is pinned, and we never |
| // offer an unpinned `&mut A` or `&mut B` through `Pin<&mut Self>`. We |
| // also don't have an implementation of `Drop`, nor manual `Unpin`. |
| </span><span class="kw">unsafe </span>{ |
| <span class="kw">match </span><span class="kw-2">*</span>Pin::get_unchecked_mut(<span class="self">self</span>) { |
| Either::Left(<span class="kw-2">ref mut </span>inner) => Either::Left(Pin::new_unchecked(inner)), |
| Either::Right(<span class="kw-2">ref mut </span>inner) => Either::Right(Pin::new_unchecked(inner)), |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B, T> Either<(T, A), (T, B)> { |
| <span class="doccomment">/// Factor out a homogeneous type from an either of pairs. |
| /// |
| /// Here, the homogeneous type is the first element of the pairs. |
| </span><span class="kw">pub fn </span>factor_first(<span class="self">self</span>) -> (T, Either<A, B>) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left((x, a)) => (x, Either::Left(a)), |
| Either::Right((x, b)) => (x, Either::Right(b)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B, T> Either<(A, T), (B, T)> { |
| <span class="doccomment">/// Factor out a homogeneous type from an either of pairs. |
| /// |
| /// Here, the homogeneous type is the second element of the pairs. |
| </span><span class="kw">pub fn </span>factor_second(<span class="self">self</span>) -> (Either<A, B>, T) { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left((a, x)) => (Either::Left(a), x), |
| Either::Right((b, x)) => (Either::Right(b), x), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> Either<T, T> { |
| <span class="doccomment">/// Extract the value of an either over two equivalent types. |
| </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(x) => x, |
| Either::Right(x) => x, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B> Future <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: Future, |
| B: Future<Output = A::Output>, |
| { |
| <span class="kw">type </span>Output = A::Output; |
| |
| <span class="kw">fn </span>poll(<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="self">Self</span>::Output> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll(cx), |
| Either::Right(x) => x.poll(cx), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B> FusedFuture <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: FusedFuture, |
| B: FusedFuture<Output = A::Output>, |
| { |
| <span class="kw">fn </span>is_terminated(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(x) => x.is_terminated(), |
| Either::Right(x) => x.is_terminated(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B> Stream <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: Stream, |
| B: Stream<Item = A::Item>, |
| { |
| <span class="kw">type </span>Item = A::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">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_next(cx), |
| Either::Right(x) => x.poll_next(cx), |
| } |
| } |
| |
| <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">match </span><span class="self">self </span>{ |
| Either::Left(x) => x.size_hint(), |
| Either::Right(x) => x.size_hint(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B> FusedStream <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: FusedStream, |
| B: FusedStream<Item = A::Item>, |
| { |
| <span class="kw">fn </span>is_terminated(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::Left(x) => x.is_terminated(), |
| Either::Right(x) => x.is_terminated(), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"sink"</span>)] |
| </span><span class="kw">impl</span><A, B, Item> Sink<Item> <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: Sink<Item>, |
| B: Sink<Item, Error = A::Error>, |
| { |
| <span class="kw">type </span>Error = A::Error; |
| |
| <span class="kw">fn </span>poll_ready(<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">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_ready(cx), |
| Either::Right(x) => x.poll_ready(cx), |
| } |
| } |
| |
| <span class="kw">fn </span>start_send(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, item: Item) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.start_send(item), |
| Either::Right(x) => x.start_send(item), |
| } |
| } |
| |
| <span class="kw">fn </span>poll_flush(<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">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_flush(cx), |
| Either::Right(x) => x.poll_flush(cx), |
| } |
| } |
| |
| <span class="kw">fn </span>poll_close(<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">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_close(cx), |
| Either::Right(x) => x.poll_close(cx), |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"io"</span>)] |
| #[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">mod </span>if_std { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>core::pin::Pin; |
| <span class="kw">use </span>core::task::{Context, Poll}; |
| <span class="kw">use </span>futures_io::{ |
| AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite, IoSlice, IoSliceMut, <span class="prelude-ty">Result</span>, SeekFrom, |
| }; |
| |
| <span class="kw">impl</span><A, B> AsyncRead <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: AsyncRead, |
| B: AsyncRead, |
| { |
| <span class="kw">fn </span>poll_read( |
| <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>>, |
| buf: <span class="kw-2">&mut </span>[u8], |
| ) -> Poll<<span class="prelude-ty">Result</span><usize>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_read(cx, buf), |
| Either::Right(x) => x.poll_read(cx, buf), |
| } |
| } |
| |
| <span class="kw">fn </span>poll_read_vectored( |
| <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>>, |
| bufs: <span class="kw-2">&mut </span>[IoSliceMut<<span class="lifetime">'_</span>>], |
| ) -> Poll<<span class="prelude-ty">Result</span><usize>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_read_vectored(cx, bufs), |
| Either::Right(x) => x.poll_read_vectored(cx, bufs), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B> AsyncWrite <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: AsyncWrite, |
| B: AsyncWrite, |
| { |
| <span class="kw">fn </span>poll_write( |
| <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>>, |
| buf: <span class="kw-2">&</span>[u8], |
| ) -> Poll<<span class="prelude-ty">Result</span><usize>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_write(cx, buf), |
| Either::Right(x) => x.poll_write(cx, buf), |
| } |
| } |
| |
| <span class="kw">fn </span>poll_write_vectored( |
| <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>>, |
| bufs: <span class="kw-2">&</span>[IoSlice<<span class="lifetime">'_</span>>], |
| ) -> Poll<<span class="prelude-ty">Result</span><usize>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_write_vectored(cx, bufs), |
| Either::Right(x) => x.poll_write_vectored(cx, bufs), |
| } |
| } |
| |
| <span class="kw">fn </span>poll_flush(<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">Result</span><()>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_flush(cx), |
| Either::Right(x) => x.poll_flush(cx), |
| } |
| } |
| |
| <span class="kw">fn </span>poll_close(<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">Result</span><()>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_close(cx), |
| Either::Right(x) => x.poll_close(cx), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B> AsyncSeek <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: AsyncSeek, |
| B: AsyncSeek, |
| { |
| <span class="kw">fn </span>poll_seek( |
| <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>>, |
| pos: SeekFrom, |
| ) -> Poll<<span class="prelude-ty">Result</span><u64>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_seek(cx, pos), |
| Either::Right(x) => x.poll_seek(cx, pos), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B> AsyncBufRead <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: AsyncBufRead, |
| B: AsyncBufRead, |
| { |
| <span class="kw">fn </span>poll_fill_buf(<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">Result</span><<span class="kw-2">&</span>[u8]>> { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.poll_fill_buf(cx), |
| Either::Right(x) => x.poll_fill_buf(cx), |
| } |
| } |
| |
| <span class="kw">fn </span>consume(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, amt: usize) { |
| <span class="kw">match </span><span class="self">self</span>.as_pin_mut() { |
| Either::Left(x) => x.consume(amt), |
| Either::Right(x) => x.consume(amt), |
| } |
| } |
| } |
| } |
| </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> |
