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<!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="Asynchronous I/O"><title>futures_io - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="futures_io" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Crate futures_io</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../futures_io/index.html">futures_<wbr>io</a><span class="version">0.3.32</span></h2></div><div class="sidebar-elems"><ul class="block"><li><a id="all-types" href="all.html">All Items</a></li></ul><section id="rustdoc-toc"><h3><a href="#reexports">Crate Items</a></h3><ul class="block"><li><a href="#reexports" title="Re-exports">Re-exports</a></li><li><a href="#traits" title="Traits">Traits</a></li></ul></section><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><h1>Crate <span>futures_<wbr>io</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/futures_io/lib.rs.html#1-561">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Asynchronous I/O</p>
<p>This crate contains the <code>AsyncRead</code>, <code>AsyncWrite</code>, <code>AsyncSeek</code>, and
<code>AsyncBufRead</code> traits, the asynchronous analogs to
<code>std::io::{Read, Write, Seek, BufRead}</code>. The primary difference is
that these traits integrate with the asynchronous task system.</p>
<p>All items of this library are only available when the <code>std</code> feature of this
library is activated, and it is activated by default.</p>
</div></details><h2 id="reexports" class="section-header">Re-exports<a href="#reexports" class="anchor">§</a></h2><dl class="item-table reexports"><dt id="reexport.Error"><code>pub use io::<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>;</code></dt><dt id="reexport.ErrorKind"><code>pub use io::<a class="enum" href="https://doc.rust-lang.org/1.93.1/std/io/error/enum.ErrorKind.html" title="enum std::io::error::ErrorKind">ErrorKind</a>;</code></dt><dt id="reexport.IoSlice"><code>pub use io::<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>;</code></dt><dt id="reexport.IoSliceMut"><code>pub use io::<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSliceMut.html" title="struct std::io::IoSliceMut">IoSliceMut</a>;</code></dt><dt id="reexport.Result"><code>pub use io::<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>;</code></dt><dt id="reexport.SeekFrom"><code>pub use io::<a class="enum" href="https://doc.rust-lang.org/1.93.1/std/io/enum.SeekFrom.html" title="enum std::io::SeekFrom">SeekFrom</a>;</code></dt></dl><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><dl class="item-table"><dt><a class="trait" href="trait.AsyncBufRead.html" title="trait futures_io::AsyncBufRead">Async<wbr>BufRead</a></dt><dd>Read bytes asynchronously.</dd><dt><a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">Async<wbr>Read</a></dt><dd>Read bytes asynchronously.</dd><dt><a class="trait" href="trait.AsyncSeek.html" title="trait futures_io::AsyncSeek">Async<wbr>Seek</a></dt><dd>Seek bytes asynchronously.</dd><dt><a class="trait" href="trait.AsyncWrite.html" title="trait futures_io::AsyncWrite">Async<wbr>Write</a></dt><dd>Write bytes asynchronously.</dd></dl></section></div></main></body></html>

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<!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="Read bytes asynchronously."><title>AsyncBufRead in futures_io - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="futures_io" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">AsyncBufRead</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../futures_io/index.html">futures_<wbr>io</a><span class="version">0.3.32</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Async<wbr>BufRead</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.consume" title="consume">consume</a></li><li><a href="#tymethod.poll_fill_buf" title="poll_fill_buf">poll_fill_buf</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-AsyncBufRead-for-%26%5Bu8%5D" title="&#38;[u8]">&#38;[u8]</a></li><li><a href="#impl-AsyncBufRead-for-%26mut+T" title="&#38;mut T">&#38;mut T</a></li><li><a href="#impl-AsyncBufRead-for-Box%3CT%3E" title="Box&#60;T&#62;">Box&#60;T&#62;</a></li><li><a href="#impl-AsyncBufRead-for-Pin%3CP%3E" title="Pin&#60;P&#62;">Pin&#60;P&#62;</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate futures_<wbr>io</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">futures_io</a></div><h1>Trait <span class="trait">Async<wbr>BufRead</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/futures_io/lib.rs.html#254-301">Source</a> </span></div><pre class="rust item-decl"><code>pub trait AsyncBufRead: <a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">AsyncRead</a> {
// Required methods
fn <a href="#tymethod.poll_fill_buf" class="fn">poll_fill_buf</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;&amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]&gt;&gt;;
<span class="item-spacer"></span> fn <a href="#tymethod.consume" class="fn">consume</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, amt: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>);
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Read bytes asynchronously.</p>
<p>This trait is analogous to the <code>std::io::BufRead</code> trait, but integrates
with the asynchronous task system. In particular, the <code>poll_fill_buf</code>
method, unlike <code>BufRead::fill_buf</code>, will automatically queue the current task
for wakeup and return if data is not yet available, rather than blocking
the calling thread.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.poll_fill_buf" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#283">Source</a><h4 class="code-header">fn <a href="#tymethod.poll_fill_buf" class="fn">poll_fill_buf</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;&amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]&gt;&gt;</h4></section></summary><div class="docblock"><p>Attempt to return the contents of the internal buffer, filling it with more data
from the inner reader if it is empty.</p>
<p>On success, returns <code>Poll::Ready(Ok(buf))</code>.</p>
<p>If no data is available for reading, the method returns
<code>Poll::Pending</code> and arranges for the current task (via
<code>cx.waker().wake_by_ref()</code>) to receive a notification when the object becomes
readable or is closed.</p>
<p>This function is a lower-level call. It needs to be paired with the
<a href="trait.AsyncBufRead.html#tymethod.consume" title="method futures_io::AsyncBufRead::consume"><code>consume</code></a> method to function properly. When calling this
method, none of the contents will be “read” in the sense that later
calling <a href="trait.AsyncRead.html#tymethod.poll_read" title="method futures_io::AsyncRead::poll_read"><code>poll_read</code></a> may return the same contents. As such, <a href="trait.AsyncBufRead.html#tymethod.consume" title="method futures_io::AsyncBufRead::consume"><code>consume</code></a> must
be called with the number of bytes that are consumed from this buffer to
ensure that the bytes are never returned twice.</p>
<p>An empty buffer returned indicates that the stream has reached EOF.</p>
<h5 id="implementation"><a class="doc-anchor" href="#implementation">§</a>Implementation</h5>
<p>This function may not return errors of kind <code>WouldBlock</code> or
<code>Interrupted</code>. Implementations must convert <code>WouldBlock</code> into
<code>Poll::Pending</code> and either internally retry or convert
<code>Interrupted</code> into another error kind.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.consume" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#300">Source</a><h4 class="code-header">fn <a href="#tymethod.consume" class="fn">consume</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, amt: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Tells this buffer that <code>amt</code> bytes have been consumed from the buffer,
so they should no longer be returned in calls to <a href="trait.AsyncRead.html#tymethod.poll_read" title="method futures_io::AsyncRead::poll_read"><code>poll_read</code></a>.</p>
<p>This function is a lower-level call. It needs to be paired with the
<a href="trait.AsyncBufRead.html#tymethod.poll_fill_buf" title="method futures_io::AsyncBufRead::poll_fill_buf"><code>poll_fill_buf</code></a> method to function properly. This function does
not perform any I/O, it simply informs this object that some amount of
its buffer, returned from <a href="trait.AsyncBufRead.html#tymethod.poll_fill_buf" title="method futures_io::AsyncBufRead::poll_fill_buf"><code>poll_fill_buf</code></a>, has been consumed and should
no longer be returned. As such, this function may do odd things if
<a href="trait.AsyncBufRead.html#tymethod.poll_fill_buf" title="method futures_io::AsyncBufRead::poll_fill_buf"><code>poll_fill_buf</code></a> isnt called before calling it.</p>
<p>The <code>amt</code> must be <code>&lt;=</code> the number of bytes in the buffer returned by
<a href="trait.AsyncBufRead.html#tymethod.poll_fill_buf" title="method futures_io::AsyncBufRead::poll_fill_buf"><code>poll_fill_buf</code></a>.</p>
</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-AsyncBufRead-for-%26%5Bu8%5D" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#555-557">Source</a><a href="#impl-AsyncBufRead-for-%26%5Bu8%5D" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.AsyncBufRead.html" title="trait futures_io::AsyncBufRead">AsyncBufRead</a> for &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]</h3></section></summary><div class="impl-items"><section id="method.poll_fill_buf" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#556">Source</a><a href="#method.poll_fill_buf" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_fill_buf" class="fn">poll_fill_buf</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
_: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;&amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]&gt;&gt;</h4></section><section id="method.consume" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#556">Source</a><a href="#method.consume" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.consume" class="fn">consume</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, amt: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncBufRead-for-Pin%3CP%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#529-541">Source</a><a href="#impl-AsyncBufRead-for-Pin%3CP%3E" class="anchor">§</a><h3 class="code-header">impl&lt;P&gt; <a class="trait" href="trait.AsyncBufRead.html" title="trait futures_io::AsyncBufRead">AsyncBufRead</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;P&gt;<div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
P::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a>: <a class="trait" href="trait.AsyncBufRead.html" title="trait futures_io::AsyncBufRead">AsyncBufRead</a>,</div></h3></section></summary><div class="impl-items"><section id="method.poll_fill_buf-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#534-536">Source</a><a href="#method.poll_fill_buf-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_fill_buf" class="fn">poll_fill_buf</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;&amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]&gt;&gt;</h4></section><section id="method.consume-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#538-540">Source</a><a href="#method.consume-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.consume" class="fn">consume</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, amt: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncBufRead-for-%26mut+T" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#525-527">Source</a><a href="#impl-AsyncBufRead-for-%26mut+T" class="anchor">§</a><h3 class="code-header">impl&lt;T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.AsyncBufRead.html" title="trait futures_io::AsyncBufRead">AsyncBufRead</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>&gt; <a class="trait" href="trait.AsyncBufRead.html" title="trait futures_io::AsyncBufRead">AsyncBufRead</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut T</a></h3></section></summary><div class="impl-items"><section id="method.poll_fill_buf-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#526">Source</a><a href="#method.poll_fill_buf-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_fill_buf" class="fn">poll_fill_buf</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;&amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]&gt;&gt;</h4></section><section id="method.consume-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#526">Source</a><a href="#method.consume-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.consume" class="fn">consume</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, amt: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncBufRead-for-Box%3CT%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#521-523">Source</a><a href="#impl-AsyncBufRead-for-Box%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.AsyncBufRead.html" title="trait futures_io::AsyncBufRead">AsyncBufRead</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>&gt; <a class="trait" href="trait.AsyncBufRead.html" title="trait futures_io::AsyncBufRead">AsyncBufRead</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><section id="method.poll_fill_buf-3" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#522">Source</a><a href="#method.poll_fill_buf-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_fill_buf" class="fn">poll_fill_buf</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;&amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]&gt;&gt;</h4></section><section id="method.consume-3" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#522">Source</a><a href="#method.consume-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.consume" class="fn">consume</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, amt: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>)</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/futures_io/if_std/trait.AsyncBufRead.js" data-ignore-extern-crates="alloc,core,std" async></script></section></div></main></body></html>

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<!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="Read bytes asynchronously."><title>AsyncRead in futures_io - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="futures_io" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">AsyncRead</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../futures_io/index.html">futures_<wbr>io</a><span class="version">0.3.32</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Async<wbr>Read</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.poll_read" title="poll_read">poll_read</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.poll_read_vectored" title="poll_read_vectored">poll_read_vectored</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-AsyncRead-for-%26%5Bu8%5D" title="&#38;[u8]">&#38;[u8]</a></li><li><a href="#impl-AsyncRead-for-%26mut+T" title="&#38;mut T">&#38;mut T</a></li><li><a href="#impl-AsyncRead-for-Box%3CT%3E" title="Box&#60;T&#62;">Box&#60;T&#62;</a></li><li><a href="#impl-AsyncRead-for-Pin%3CP%3E" title="Pin&#60;P&#62;">Pin&#60;P&#62;</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate futures_<wbr>io</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">futures_io</a></div><h1>Trait <span class="trait">Async<wbr>Read</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/futures_io/lib.rs.html#47-104">Source</a> </span></div><pre class="rust item-decl"><code>pub trait AsyncRead {
// Required method
fn <a href="#tymethod.poll_read" class="fn">poll_read</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;mut [<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;;
// Provided method
fn <a href="#method.poll_read_vectored" class="fn">poll_read_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;mut [<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSliceMut.html" title="struct std::io::IoSliceMut">IoSliceMut</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt; { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Read bytes asynchronously.</p>
<p>This trait is analogous to the <code>std::io::Read</code> trait, but integrates
with the asynchronous task system. In particular, the <code>poll_read</code>
method, unlike <code>Read::read</code>, will automatically queue the current task
for wakeup and return if data is not yet available, rather than blocking
the calling thread.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.poll_read" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#63-67">Source</a><h4 class="code-header">fn <a href="#tymethod.poll_read" class="fn">poll_read</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;mut [<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section></summary><div class="docblock"><p>Attempt to read from the <code>AsyncRead</code> into <code>buf</code>.</p>
<p>On success, returns <code>Poll::Ready(Ok(num_bytes_read))</code>.</p>
<p>If no data is available for reading, the method returns
<code>Poll::Pending</code> and arranges for the current task (via
<code>cx.waker().wake_by_ref()</code>) to receive a notification when the object becomes
readable or is closed.</p>
<h5 id="implementation"><a class="doc-anchor" href="#implementation">§</a>Implementation</h5>
<p>This function may not return errors of kind <code>WouldBlock</code> or
<code>Interrupted</code>. Implementations must convert <code>WouldBlock</code> into
<code>Poll::Pending</code> and either internally retry or convert
<code>Interrupted</code> into another error kind.</p>
</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.poll_read_vectored" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#91-103">Source</a><h4 class="code-header">fn <a href="#method.poll_read_vectored" class="fn">poll_read_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;mut [<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSliceMut.html" title="struct std::io::IoSliceMut">IoSliceMut</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section></summary><div class="docblock"><p>Attempt to read from the <code>AsyncRead</code> into <code>bufs</code> using vectored
IO operations.</p>
<p>This method is similar to <code>poll_read</code>, but allows data to be read
into multiple buffers using a single operation.</p>
<p>On success, returns <code>Poll::Ready(Ok(num_bytes_read))</code>.</p>
<p>If no data is available for reading, the method returns
<code>Poll::Pending</code> and arranges for the current task (via
<code>cx.waker().wake_by_ref()</code>) to receive a notification when the object becomes
readable or is closed.
By default, this method delegates to using <code>poll_read</code> on the first
nonempty buffer in <code>bufs</code>, or an empty one if none exists. Objects which
support vectored IO should override this method.</p>
<h5 id="implementation-1"><a class="doc-anchor" href="#implementation-1">§</a>Implementation</h5>
<p>This function may not return errors of kind <code>WouldBlock</code> or
<code>Interrupted</code>. Implementations must convert <code>WouldBlock</code> into
<code>Poll::Pending</code> and either internally retry or convert
<code>Interrupted</code> into another error kind.</p>
</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-AsyncRead-for-%26%5Bu8%5D" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#373-375">Source</a><a href="#impl-AsyncRead-for-%26%5Bu8%5D" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">AsyncRead</a> for &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]</h3></section></summary><div class="impl-items"><section id="method.poll_read" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#374">Source</a><a href="#method.poll_read" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_read" class="fn">poll_read</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
_: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;mut [<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_read_vectored-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#374">Source</a><a href="#method.poll_read_vectored-1" class="anchor">§</a><h4 class="code-header">fn <a href="#method.poll_read_vectored" class="fn">poll_read_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
_: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;mut [<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSliceMut.html" title="struct std::io::IoSliceMut">IoSliceMut</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncRead-for-Pin%3CP%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#331-351">Source</a><a href="#impl-AsyncRead-for-Pin%3CP%3E" class="anchor">§</a><h3 class="code-header">impl&lt;P&gt; <a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">AsyncRead</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;P&gt;<div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
P::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a>: <a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">AsyncRead</a>,</div></h3></section></summary><div class="impl-items"><section id="method.poll_read-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#336-342">Source</a><a href="#method.poll_read-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_read" class="fn">poll_read</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;mut [<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_read_vectored-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#344-350">Source</a><a href="#method.poll_read_vectored-2" class="anchor">§</a><h4 class="code-header">fn <a href="#method.poll_read_vectored" class="fn">poll_read_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;mut [<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSliceMut.html" title="struct std::io::IoSliceMut">IoSliceMut</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncRead-for-%26mut+T" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#327-329">Source</a><a href="#impl-AsyncRead-for-%26mut+T" class="anchor">§</a><h3 class="code-header">impl&lt;T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">AsyncRead</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>&gt; <a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">AsyncRead</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut T</a></h3></section></summary><div class="impl-items"><section id="method.poll_read-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#328">Source</a><a href="#method.poll_read-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_read" class="fn">poll_read</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;mut [<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_read_vectored-3" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#328">Source</a><a href="#method.poll_read_vectored-3" class="anchor">§</a><h4 class="code-header">fn <a href="#method.poll_read_vectored" class="fn">poll_read_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;mut [<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSliceMut.html" title="struct std::io::IoSliceMut">IoSliceMut</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncRead-for-Box%3CT%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#323-325">Source</a><a href="#impl-AsyncRead-for-Box%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">AsyncRead</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>&gt; <a class="trait" href="trait.AsyncRead.html" title="trait futures_io::AsyncRead">AsyncRead</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><section id="method.poll_read-3" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#324">Source</a><a href="#method.poll_read-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_read" class="fn">poll_read</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;mut [<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_read_vectored-4" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#324">Source</a><a href="#method.poll_read_vectored-4" class="anchor">§</a><h4 class="code-header">fn <a href="#method.poll_read_vectored" class="fn">poll_read_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;mut [<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSliceMut.html" title="struct std::io::IoSliceMut">IoSliceMut</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/futures_io/if_std/trait.AsyncRead.js" data-ignore-extern-crates="alloc,core,std" async></script></section></div></main></body></html>

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<!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="Seek bytes asynchronously."><title>AsyncSeek in futures_io - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="futures_io" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">AsyncSeek</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../futures_io/index.html">futures_<wbr>io</a><span class="version">0.3.32</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Async<wbr>Seek</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.poll_seek" title="poll_seek">poll_seek</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-AsyncSeek-for-%26mut+T" title="&#38;mut T">&#38;mut T</a></li><li><a href="#impl-AsyncSeek-for-Box%3CT%3E" title="Box&#60;T&#62;">Box&#60;T&#62;</a></li><li><a href="#impl-AsyncSeek-for-Pin%3CP%3E" title="Pin&#60;P&#62;">Pin&#60;P&#62;</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate futures_<wbr>io</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">futures_io</a></div><h1>Trait <span class="trait">Async<wbr>Seek</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/futures_io/lib.rs.html#220-245">Source</a> </span></div><pre class="rust item-decl"><code>pub trait AsyncSeek {
// Required method
fn <a href="#tymethod.poll_seek" class="fn">poll_seek</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
pos: <a class="enum" href="https://doc.rust-lang.org/1.93.1/std/io/enum.SeekFrom.html" title="enum std::io::SeekFrom">SeekFrom</a>,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u64.html">u64</a>&gt;&gt;;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Seek bytes asynchronously.</p>
<p>This trait is analogous to the <code>std::io::Seek</code> trait, but integrates
with the asynchronous task system. In particular, the <code>poll_seek</code>
method, unlike <code>Seek::seek</code>, will automatically queue the current task
for wakeup and return if data is not yet available, rather than blocking
the calling thread.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.poll_seek" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#240-244">Source</a><h4 class="code-header">fn <a href="#tymethod.poll_seek" class="fn">poll_seek</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
pos: <a class="enum" href="https://doc.rust-lang.org/1.93.1/std/io/enum.SeekFrom.html" title="enum std::io::SeekFrom">SeekFrom</a>,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u64.html">u64</a>&gt;&gt;</h4></section></summary><div class="docblock"><p>Attempt to seek to an offset, in bytes, in a stream.</p>
<p>A seek beyond the end of a stream is allowed, but behavior is defined
by the implementation.</p>
<p>If the seek operation completed successfully,
this method returns the new position from the start of the stream.
That position can be used later with <a href="https://doc.rust-lang.org/1.93.1/std/io/enum.SeekFrom.html#variant.Start" title="variant std::io::SeekFrom::Start"><code>SeekFrom::Start</code></a>.</p>
<h5 id="errors"><a class="doc-anchor" href="#errors">§</a>Errors</h5>
<p>Seeking to a negative offset is considered an error.</p>
<h5 id="implementation"><a class="doc-anchor" href="#implementation">§</a>Implementation</h5>
<p>This function may not return errors of kind <code>WouldBlock</code> or
<code>Interrupted</code>. Implementations must convert <code>WouldBlock</code> into
<code>Poll::Pending</code> and either internally retry or convert
<code>Interrupted</code> into another error kind.</p>
</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-AsyncSeek-for-Pin%3CP%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#495-507">Source</a><a href="#impl-AsyncSeek-for-Pin%3CP%3E" class="anchor">§</a><h3 class="code-header">impl&lt;P&gt; <a class="trait" href="trait.AsyncSeek.html" title="trait futures_io::AsyncSeek">AsyncSeek</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;P&gt;<div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
P::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a>: <a class="trait" href="trait.AsyncSeek.html" title="trait futures_io::AsyncSeek">AsyncSeek</a>,</div></h3></section></summary><div class="impl-items"><section id="method.poll_seek" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#500-506">Source</a><a href="#method.poll_seek" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_seek" class="fn">poll_seek</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
pos: <a class="enum" href="https://doc.rust-lang.org/1.93.1/std/io/enum.SeekFrom.html" title="enum std::io::SeekFrom">SeekFrom</a>,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u64.html">u64</a>&gt;&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncSeek-for-%26mut+T" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#491-493">Source</a><a href="#impl-AsyncSeek-for-%26mut+T" class="anchor">§</a><h3 class="code-header">impl&lt;T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.AsyncSeek.html" title="trait futures_io::AsyncSeek">AsyncSeek</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>&gt; <a class="trait" href="trait.AsyncSeek.html" title="trait futures_io::AsyncSeek">AsyncSeek</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut T</a></h3></section></summary><div class="impl-items"><section id="method.poll_seek-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#492">Source</a><a href="#method.poll_seek-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_seek" class="fn">poll_seek</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
pos: <a class="enum" href="https://doc.rust-lang.org/1.93.1/std/io/enum.SeekFrom.html" title="enum std::io::SeekFrom">SeekFrom</a>,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u64.html">u64</a>&gt;&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncSeek-for-Box%3CT%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#487-489">Source</a><a href="#impl-AsyncSeek-for-Box%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.AsyncSeek.html" title="trait futures_io::AsyncSeek">AsyncSeek</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>&gt; <a class="trait" href="trait.AsyncSeek.html" title="trait futures_io::AsyncSeek">AsyncSeek</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><section id="method.poll_seek-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#488">Source</a><a href="#method.poll_seek-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_seek" class="fn">poll_seek</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
pos: <a class="enum" href="https://doc.rust-lang.org/1.93.1/std/io/enum.SeekFrom.html" title="enum std::io::SeekFrom">SeekFrom</a>,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u64.html">u64</a>&gt;&gt;</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/futures_io/if_std/trait.AsyncSeek.js" data-ignore-extern-crates="alloc,core" async></script></section></div></main></body></html>

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<!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="Write bytes asynchronously."><title>AsyncWrite in futures_io - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="futures_io" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">AsyncWrite</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../futures_io/index.html">futures_<wbr>io</a><span class="version">0.3.32</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Async<wbr>Write</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.poll_close" title="poll_close">poll_close</a></li><li><a href="#tymethod.poll_flush" title="poll_flush">poll_flush</a></li><li><a href="#tymethod.poll_write" title="poll_write">poll_write</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.poll_write_vectored" title="poll_write_vectored">poll_write_vectored</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-AsyncWrite-for-%26mut+T" title="&#38;mut T">&#38;mut T</a></li><li><a href="#impl-AsyncWrite-for-Box%3CT%3E" title="Box&#60;T&#62;">Box&#60;T&#62;</a></li><li><a href="#impl-AsyncWrite-for-Pin%3CP%3E" title="Pin&#60;P&#62;">Pin&#60;P&#62;</a></li><li><a href="#impl-AsyncWrite-for-Vec%3Cu8%3E" title="Vec&#60;u8&#62;">Vec&#60;u8&#62;</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate futures_<wbr>io</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">futures_io</a></div><h1>Trait <span class="trait">Async<wbr>Write</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/futures_io/lib.rs.html#113-211">Source</a> </span></div><pre class="rust item-decl"><code>pub trait AsyncWrite {
// Required methods
fn <a href="#tymethod.poll_write" class="fn">poll_write</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;;
<span class="item-spacer"></span> fn <a href="#tymethod.poll_flush" class="fn">poll_flush</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;;
<span class="item-spacer"></span> fn <a href="#tymethod.poll_close" class="fn">poll_close</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;;
// Provided method
fn <a href="#method.poll_write_vectored" class="fn">poll_write_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;[<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt; { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Write bytes asynchronously.</p>
<p>This trait is analogous to the <code>std::io::Write</code> trait, but integrates
with the asynchronous task system. In particular, the <code>poll_write</code>
method, unlike <code>Write::write</code>, will automatically queue the current task
for wakeup and return if the writer cannot take more data, rather than blocking
the calling thread.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.poll_write" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#132-136">Source</a><h4 class="code-header">fn <a href="#tymethod.poll_write" class="fn">poll_write</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section></summary><div class="docblock"><p>Attempt to write bytes from <code>buf</code> into the object.</p>
<p>On success, returns <code>Poll::Ready(Ok(num_bytes_written))</code>.</p>
<p>If the object is not ready for writing, the method returns
<code>Poll::Pending</code> and arranges for the current task (via
<code>cx.waker().wake_by_ref()</code>) to receive a notification when the object becomes
writable or is closed.</p>
<h5 id="implementation"><a class="doc-anchor" href="#implementation">§</a>Implementation</h5>
<p>This function may not return errors of kind <code>WouldBlock</code> or
<code>Interrupted</code>. Implementations must convert <code>WouldBlock</code> into
<code>Poll::Pending</code> and either internally retry or convert
<code>Interrupted</code> into another error kind.</p>
<p><code>poll_write</code> must try to make progress by flushing the underlying object if
that is the only way the underlying object can become writable again.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.poll_flush" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#193">Source</a><h4 class="code-header">fn <a href="#tymethod.poll_flush" class="fn">poll_flush</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section></summary><div class="docblock"><p>Attempt to flush the object, ensuring that any buffered data reach
their destination.</p>
<p>On success, returns <code>Poll::Ready(Ok(()))</code>.</p>
<p>If flushing cannot immediately complete, this method returns
<code>Poll::Pending</code> and arranges for the current task (via
<code>cx.waker().wake_by_ref()</code>) to receive a notification when the object can make
progress towards flushing.</p>
<h5 id="implementation-1"><a class="doc-anchor" href="#implementation-1">§</a>Implementation</h5>
<p>This function may not return errors of kind <code>WouldBlock</code> or
<code>Interrupted</code>. Implementations must convert <code>WouldBlock</code> into
<code>Poll::Pending</code> and either internally retry or convert
<code>Interrupted</code> into another error kind.</p>
<p>It only makes sense to do anything here if you actually buffer data.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.poll_close" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#210">Source</a><h4 class="code-header">fn <a href="#tymethod.poll_close" class="fn">poll_close</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section></summary><div class="docblock"><p>Attempt to close the object.</p>
<p>On success, returns <code>Poll::Ready(Ok(()))</code>.</p>
<p>If closing cannot immediately complete, this function returns
<code>Poll::Pending</code> and arranges for the current task (via
<code>cx.waker().wake_by_ref()</code>) to receive a notification when the object can make
progress towards closing.</p>
<h5 id="implementation-2"><a class="doc-anchor" href="#implementation-2">§</a>Implementation</h5>
<p>This function may not return errors of kind <code>WouldBlock</code> or
<code>Interrupted</code>. Implementations must convert <code>WouldBlock</code> into
<code>Poll::Pending</code> and either internally retry or convert
<code>Interrupted</code> into another error kind.</p>
</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.poll_write_vectored" class="method"><a class="src rightside" href="../src/futures_io/lib.rs.html#161-173">Source</a><h4 class="code-header">fn <a href="#method.poll_write_vectored" class="fn">poll_write_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;[<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section></summary><div class="docblock"><p>Attempt to write bytes from <code>bufs</code> into the object using vectored
IO operations.</p>
<p>This method is similar to <code>poll_write</code>, but allows data from multiple buffers to be written
using a single operation.</p>
<p>On success, returns <code>Poll::Ready(Ok(num_bytes_written))</code>.</p>
<p>If the object is not ready for writing, the method returns
<code>Poll::Pending</code> and arranges for the current task (via
<code>cx.waker().wake_by_ref()</code>) to receive a notification when the object becomes
writable or is closed.</p>
<p>By default, this method delegates to using <code>poll_write</code> on the first
nonempty buffer in <code>bufs</code>, or an empty one if none exists. Objects which
support vectored IO should override this method.</p>
<h5 id="implementation-3"><a class="doc-anchor" href="#implementation-3">§</a>Implementation</h5>
<p>This function may not return errors of kind <code>WouldBlock</code> or
<code>Interrupted</code>. Implementations must convert <code>WouldBlock</code> into
<code>Poll::Pending</code> and either internally retry or convert
<code>Interrupted</code> into another error kind.</p>
</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-AsyncWrite-for-Vec%3Cu8%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#471-473">Source</a><a href="#impl-AsyncWrite-for-Vec%3Cu8%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.AsyncWrite.html" title="trait futures_io::AsyncWrite">AsyncWrite</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;</h3></section></summary><div class="impl-items"><section id="method.poll_write" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#472">Source</a><a href="#method.poll_write" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_write" class="fn">poll_write</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
_: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_write_vectored-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#472">Source</a><a href="#method.poll_write_vectored-1" class="anchor">§</a><h4 class="code-header">fn <a href="#method.poll_write_vectored" class="fn">poll_write_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
_: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;[<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_flush" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#472">Source</a><a href="#method.poll_flush" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_flush" class="fn">poll_flush</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, _: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section><section id="method.poll_close" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#472">Source</a><a href="#method.poll_close" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_close" class="fn">poll_close</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncWrite-for-Pin%3CP%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#413-441">Source</a><a href="#impl-AsyncWrite-for-Pin%3CP%3E" class="anchor">§</a><h3 class="code-header">impl&lt;P&gt; <a class="trait" href="trait.AsyncWrite.html" title="trait futures_io::AsyncWrite">AsyncWrite</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;P&gt;<div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
P::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a>: <a class="trait" href="trait.AsyncWrite.html" title="trait futures_io::AsyncWrite">AsyncWrite</a>,</div></h3></section></summary><div class="impl-items"><section id="method.poll_write-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#418-424">Source</a><a href="#method.poll_write-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_write" class="fn">poll_write</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_write_vectored-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#426-432">Source</a><a href="#method.poll_write_vectored-2" class="anchor">§</a><h4 class="code-header">fn <a href="#method.poll_write_vectored" class="fn">poll_write_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;[<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_flush-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#434-436">Source</a><a href="#method.poll_flush-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_flush" class="fn">poll_flush</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section><section id="method.poll_close-1" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#438-440">Source</a><a href="#method.poll_close-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_close" class="fn">poll_close</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncWrite-for-%26mut+T" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#409-411">Source</a><a href="#impl-AsyncWrite-for-%26mut+T" class="anchor">§</a><h3 class="code-header">impl&lt;T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.AsyncWrite.html" title="trait futures_io::AsyncWrite">AsyncWrite</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>&gt; <a class="trait" href="trait.AsyncWrite.html" title="trait futures_io::AsyncWrite">AsyncWrite</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut T</a></h3></section></summary><div class="impl-items"><section id="method.poll_write-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#410">Source</a><a href="#method.poll_write-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_write" class="fn">poll_write</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_write_vectored-3" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#410">Source</a><a href="#method.poll_write_vectored-3" class="anchor">§</a><h4 class="code-header">fn <a href="#method.poll_write_vectored" class="fn">poll_write_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;[<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_flush-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#410">Source</a><a href="#method.poll_flush-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_flush" class="fn">poll_flush</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section><section id="method.poll_close-2" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#410">Source</a><a href="#method.poll_close-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_close" class="fn">poll_close</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-AsyncWrite-for-Box%3CT%3E" class="impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#405-407">Source</a><a href="#impl-AsyncWrite-for-Box%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.AsyncWrite.html" title="trait futures_io::AsyncWrite">AsyncWrite</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>&gt; <a class="trait" href="trait.AsyncWrite.html" title="trait futures_io::AsyncWrite">AsyncWrite</a> for <a class="struct" href="https://doc.rust-lang.org/1.93.1/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><section id="method.poll_write-3" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#406">Source</a><a href="#method.poll_write-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_write" class="fn">poll_write</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
buf: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_write_vectored-4" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#406">Source</a><a href="#method.poll_write_vectored-4" class="anchor">§</a><h4 class="code-header">fn <a href="#method.poll_write_vectored" class="fn">poll_write_vectored</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;,
cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;,
bufs: &amp;[<a class="struct" href="https://doc.rust-lang.org/1.93.1/std/io/struct.IoSlice.html" title="struct std::io::IoSlice">IoSlice</a>&lt;'_&gt;],
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>&gt;&gt;</h4></section><section id="method.poll_flush-3" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#406">Source</a><a href="#method.poll_flush-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_flush" class="fn">poll_flush</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section><section id="method.poll_close-3" class="method trait-impl"><a class="src rightside" href="../src/futures_io/lib.rs.html#406">Source</a><a href="#method.poll_close-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.poll_close" class="fn">poll_close</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;&amp;mut Self&gt;, cx: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.93.1/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>&gt;&gt;</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/futures_io/if_std/trait.AsyncWrite.js" data-ignore-extern-crates="alloc,core" async></script></section></div></main></body></html>