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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="API documentation for the Rust `TryStream` trait in crate `futures`."><meta name="keywords" content="rust, rustlang, rust-lang, TryStream"><title>futures::stream::TryStream - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../futures/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><p class="location">Trait TryStream</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Error">Error</a><a href="#associatedtype.Ok">Ok</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.try_poll_next">try_poll_next</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class="location"><a href="../index.html">futures</a>::<wbr><a href="index.html">stream</a></p><div id="sidebar-vars" data-name="TryStream" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"></div><button type="button" class="help-button">?</button>
<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Trait <a href="../index.html">futures</a>::<wbr><a href="index.html">stream</a>::<wbr><a class="trait" href="">TryStream</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/futures_core/stream.rs.html#176-190" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust trait">pub trait TryStream: <a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Stream</a> + Sealed {
type <a href="#associatedtype.Ok" class="type">Ok</a>;
type <a href="#associatedtype.Error" class="type">Error</a>;
pub fn <a href="#tymethod.try_poll_next" class="fnname">try_poll_next</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>Self&gt;, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cx: &amp;mut <a class="struct" href="../../futures/task/struct.Context.html" title="struct futures::task::Context">Context</a>&lt;'_&gt;<br>&nbsp;&nbsp;&nbsp;&nbsp;) -&gt; <a class="enum" href="../../futures/task/enum.Poll.html" title="enum futures::task::Poll">Poll</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../futures/stream/trait.TryStream.html#associatedtype.Ok" title="type futures::stream::TryStream::Ok">Ok</a>, Self::<a class="type" href="../../futures/stream/trait.TryStream.html#associatedtype.Error" title="type futures::stream::TryStream::Error">Error</a>&gt;&gt;&gt;;
}</pre></div><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><h2 id="associated-types" class="small-section-header">Associated Types<a href="#associated-types" class="anchor"></a></h2><div class="methods"><h3 id="associatedtype.Ok" class="method"><code>type <a href="#associatedtype.Ok" class="type">Ok</a></code><a class="srclink" href="../../src/futures_core/stream.rs.html#178" title="goto source code">[src]</a></h3><div class="docblock"><p>The type of successful values yielded by this future</p>
</div><h3 id="associatedtype.Error" class="method"><code>type <a href="#associatedtype.Error" class="type">Error</a></code><a class="srclink" href="../../src/futures_core/stream.rs.html#181" title="goto source code">[src]</a></h3><div class="docblock"><p>The type of failures yielded by this future</p>
</div></div><span class="loading-content">Loading content...</span><h2 id="required-methods" class="small-section-header">Required methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><h3 id="tymethod.try_poll_next" class="method"><code>pub fn <a href="#tymethod.try_poll_next" class="fnname">try_poll_next</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>Self&gt;, <br>&nbsp;&nbsp;&nbsp;&nbsp;cx: &amp;mut <a class="struct" href="../../futures/task/struct.Context.html" title="struct futures::task::Context">Context</a>&lt;'_&gt;<br>) -&gt; <a class="enum" href="../../futures/task/enum.Poll.html" title="enum futures::task::Poll">Poll</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../futures/stream/trait.TryStream.html#associatedtype.Ok" title="type futures::stream::TryStream::Ok">Ok</a>, Self::<a class="type" href="../../futures/stream/trait.TryStream.html#associatedtype.Error" title="type futures::stream::TryStream::Error">Error</a>&gt;&gt;&gt;</code><a class="srclink" href="../../src/futures_core/stream.rs.html#188-189" title="goto source code">[src]</a></h3><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 won't be
needed.</p>
</div></div><span class="loading-content">Loading content...</span><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><h3 id="impl-TryStream" class="impl"><code class="in-band">impl&lt;S, T, E&gt; TryStream for S <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;S: <a class="trait" href="../../futures/stream/trait.Stream.html" title="trait futures::stream::Stream">Stream</a>&lt;Item = <a class="enum" href="https://doc.rust-lang.org/nightly/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/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></code><a href="#impl-TryStream" class="anchor"></a><a class="srclink" href="../../src/futures_core/stream.rs.html#192-203" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Ok-1" class="type"><code>type <a href="#associatedtype.Ok-1" class="type">Ok</a> = T</code></h4><h4 id="associatedtype.Error-1" class="type"><code>type <a href="#associatedtype.Error-1" class="type">Error</a> = E</code></h4><h4 id="method.try_poll_next" class="method hidden"><code>pub fn <a href="#method.try_poll_next" class="fnname">try_poll_next</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>S&gt;, <br>&nbsp;&nbsp;&nbsp;&nbsp;cx: &amp;mut <a class="struct" href="../../futures/task/struct.Context.html" title="struct futures::task::Context">Context</a>&lt;'_&gt;<br>) -&gt; <a class="enum" href="../../futures/task/enum.Poll.html" title="enum futures::task::Poll">Poll</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;&lt;S as <a class="trait" href="../../futures/stream/trait.TryStream.html" title="trait futures::stream::TryStream">TryStream</a>&gt;::<a class="type" href="../../futures/stream/trait.TryStream.html#associatedtype.Ok" title="type futures::stream::TryStream::Ok">Ok</a>, &lt;S as <a class="trait" href="../../futures/stream/trait.TryStream.html" title="trait futures::stream::TryStream">TryStream</a>&gt;::<a class="type" href="../../futures/stream/trait.TryStream.html#associatedtype.Error" title="type futures::stream::TryStream::Error">Error</a>&gt;&gt;&gt;</code><a class="srclink" href="../../src/futures_core/stream.rs.html#198-199" title="goto source code">[src]</a></h4></div></div><span class="loading-content">Loading content...</span><script type="text/javascript" src="../../implementors/futures_core/stream/trait.TryStream.js" async></script></section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../" data-current-crate="futures"></div>
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