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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="A convenience for streams that return `Result` values that includes a variety of adapters tailored to such futures."><title>TryStream in futures_util::stream - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-492a78a4a87dcc01.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="futures_util" data-themes="" data-resource-suffix="" data-rustdoc-version="1.82.0 (f6e511eec 2024-10-15)" data-channel="1.82.0" data-search-js="search-a99f1315e7cc5121.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-921df33f47b8780c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-3b12f09e550e0385.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.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]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../futures_util/index.html">futures_<wbr>util</a><span class="version">0.3.31</span></h2></div><h2 class="location"><a href="#">TryStream</a></h2><div class="sidebar-elems"><section><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Error">Error</a></li><li><a href="#associatedtype.Ok">Ok</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.try_poll_next">try_poll_next</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In futures_<wbr>util::<wbr>stream</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="../index.html">futures_util</a>::<wbr><a href="index.html">stream</a>::<wbr><a class="trait" href="#">TryStream</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/futures_core/stream.rs.html#177">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub trait TryStream: <a class="trait" href="trait.Stream.html" title="trait futures_util::stream::Stream">Stream</a> + Sealed {
type <a href="#associatedtype.Ok" class="associatedtype">Ok</a>;
type <a href="#associatedtype.Error" class="associatedtype">Error</a>;
// Required method
fn <a href="#tymethod.try_poll_next" class="fn">try_poll_next</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="associatedtype" href="trait.TryStream.html#associatedtype.Ok" title="type futures_util::stream::TryStream::Ok">Ok</a>, Self::<a class="associatedtype" href="trait.TryStream.html#associatedtype.Error" title="type futures_util::stream::TryStream::Error">Error</a>&gt;&gt;&gt;;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A convenience for streams that return <code>Result</code> values that includes
a variety of adapters tailored to such futures.</p>
</div></details><h2 id="required-associated-types" class="section-header">Required Associated Types<a href="#required-associated-types" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedtype.Ok" class="method"><a class="src rightside" href="../../src/futures_core/stream.rs.html#179">source</a><h4 class="code-header">type <a href="#associatedtype.Ok" class="associatedtype">Ok</a></h4></section></summary><div class="docblock"><p>The type of successful values yielded by this future</p>
</div></details><details class="toggle" open><summary><section id="associatedtype.Error" class="method"><a class="src rightside" href="../../src/futures_core/stream.rs.html#182">source</a><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a></h4></section></summary><div class="docblock"><p>The type of failures yielded by this future</p>
</div></details></div><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.try_poll_next" class="method"><a class="src rightside" href="../../src/futures_core/stream.rs.html#189-192">source</a><h4 class="code-header">fn <a href="#tymethod.try_poll_next" class="fn">try_poll_next</a>(
self: <a class="struct" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="associatedtype" href="trait.TryStream.html#associatedtype.Ok" title="type futures_util::stream::TryStream::Ok">Ok</a>, Self::<a class="associatedtype" href="trait.TryStream.html#associatedtype.Error" title="type futures_util::stream::TryStream::Error">Error</a>&gt;&gt;&gt;</h4></section></summary><div class="docblock"><p>Poll this <code>TryStream</code> as if it were a <code>Stream</code>.</p>
<p>This method is a stopgap for a compiler limitation that prevents us from
directly inheriting from the <code>Stream</code> trait; in the future it wont be
needed.</p>
</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><details class="toggle implementors-toggle"><summary><section id="impl-TryStream-for-S" class="impl"><a class="src rightside" href="../../src/futures_core/stream.rs.html#195-197">source</a><a href="#impl-TryStream-for-S" class="anchor">§</a><h3 class="code-header">impl&lt;S, T, E&gt; <a class="trait" href="trait.TryStream.html" title="trait futures_util::stream::TryStream">TryStream</a> for S<div class="where">where
S: <a class="trait" href="trait.Stream.html" title="trait futures_util::stream::Stream">Stream</a>&lt;Item = <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, E&gt;&gt; + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Ok-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/futures_core/stream.rs.html#199">source</a><a href="#associatedtype.Ok-1" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Ok" class="associatedtype">Ok</a> = T</h4></section><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/futures_core/stream.rs.html#200">source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a> = E</h4></section></div></details></div><script src="../../trait.impl/futures_core/stream/trait.TryStream.js" async></script></section></div></main></body></html>