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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 futures that return `Result` values that includes a variety of adapters tailored to such futures."><title>TryFuture in futures_util::future - 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-b0742ba02757f159.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="1.83.0 (90b35a623 2024-11-26)" data-channel="1.83.0" data-search-js="search-f0d225181b97f9a4.js" data-settings-js="settings-805db61a62df4bd2.js" ><script src="../../static.files/storage-1d39b6787ed640ff.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-f070b9041d14864c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-0111fcff984fae8f.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><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">TryFuture</a></h2><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Error" title="Error">Error</a></li><li><a href="#associatedtype.Ok" title="Ok">Ok</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.try_poll" title="try_poll">try_poll</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In futures_<wbr>util::<wbr>future</a></h2></div></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"><span class="rustdoc-breadcrumbs"><a href="../index.html">futures_util</a>::<wbr><a href="index.html">future</a></span><h1>Trait <span class="trait">TryFuture</span><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_core/future.rs.html#68">source</a> </span></div><pre class="rust item-decl"><code>pub trait TryFuture: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a> + Sealed {
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type <a href="#associatedtype.Ok" class="associatedtype">Ok</a>;
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type <a href="#associatedtype.Error" class="associatedtype">Error</a>;
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// Required method
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fn <a href="#tymethod.try_poll" class="fn">try_poll</a>(
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self: <a class="struct" href="https://doc.rust-lang.org/1.83.0/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut Self>,
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cx: &mut <a class="struct" href="https://doc.rust-lang.org/1.83.0/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a><'_>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.83.0/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a><<a class="enum" href="https://doc.rust-lang.org/1.83.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.TryFuture.html#associatedtype.Ok" title="type futures_util::future::TryFuture::Ok">Ok</a>, Self::<a class="associatedtype" href="trait.TryFuture.html#associatedtype.Error" title="type futures_util::future::TryFuture::Error">Error</a>>>;
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A convenience for futures that return <code>Result</code> values that includes
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a variety of adapters tailored to such futures.</p>
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</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/future.rs.html#70">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>
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</div></details><details class="toggle" open><summary><section id="associatedtype.Error" class="method"><a class="src rightside" href="../../src/futures_core/future.rs.html#73">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>
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</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" class="method"><a class="src rightside" href="../../src/futures_core/future.rs.html#80">source</a><h4 class="code-header">fn <a href="#tymethod.try_poll" class="fn">try_poll</a>(
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self: <a class="struct" href="https://doc.rust-lang.org/1.83.0/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut Self>,
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cx: &mut <a class="struct" href="https://doc.rust-lang.org/1.83.0/core/task/wake/struct.Context.html" title="struct core::task::wake::Context">Context</a><'_>,
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) -> <a class="enum" href="https://doc.rust-lang.org/1.83.0/core/task/poll/enum.Poll.html" title="enum core::task::poll::Poll">Poll</a><<a class="enum" href="https://doc.rust-lang.org/1.83.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.TryFuture.html#associatedtype.Ok" title="type futures_util::future::TryFuture::Ok">Ok</a>, Self::<a class="associatedtype" href="trait.TryFuture.html#associatedtype.Error" title="type futures_util::future::TryFuture::Error">Error</a>>></h4></section></summary><div class="docblock"><p>Poll this <code>TryFuture</code> as if it were a <code>Future</code>.</p>
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<p>This method is a stopgap for a compiler limitation that prevents us from
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directly inheriting from the <code>Future</code> trait; in the future it won’t be
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needed.</p>
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</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-TryFuture-for-F" class="impl"><a class="src rightside" href="../../src/futures_core/future.rs.html#83-85">source</a><a href="#impl-TryFuture-for-F" class="anchor">§</a><h3 class="code-header">impl<F, T, E> <a class="trait" href="trait.TryFuture.html" title="trait futures_util::future::TryFuture">TryFuture</a> for F<div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = <a class="enum" href="https://doc.rust-lang.org/1.83.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, E>> + ?<a class="trait" href="https://doc.rust-lang.org/1.83.0/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/future.rs.html#87">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/future.rs.html#88">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/future/trait.TryFuture.js" async></script></section></div></main></body></html>
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