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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="Extension trait for `Spawn`."><title>SpawnExt in futures::task - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="futures" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><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">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../futures/index.html">futures</a><span class="version">0.3.28</span></h2></div><h2 class="location"><a href="#">SpawnExt</a></h2><div class="sidebar-elems"><section><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.spawn">spawn</a></li><li><a href="#method.spawn_with_handle">spawn_with_handle</a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In futures::task</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../futures/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="../index.html">futures</a>::<wbr><a href="index.html">task</a>::<wbr><a class="trait" href="#">SpawnExt</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/futures_util/task/spawn.rs.html#20">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait SpawnExt: <a class="trait" href="trait.Spawn.html" title="trait futures::task::Spawn">Spawn</a> {
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// Provided methods
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fn <a href="#method.spawn" class="fn">spawn</a><Fut>(&self, future: Fut) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.unit.html">()</a>, <a class="struct" href="struct.SpawnError.html" title="struct futures::task::SpawnError">SpawnError</a>>
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<span class="where">where Fut: <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a><Output = <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.unit.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static</span> { ... }
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<span class="item-spacer"></span> fn <a href="#method.spawn_with_handle" class="fn">spawn_with_handle</a><Fut>(
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&self,
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future: Fut
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) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../future/struct.RemoteHandle.html" title="struct futures::future::RemoteHandle">RemoteHandle</a><<Fut as <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a>>::<a class="associatedtype" href="../future/trait.Future.html#associatedtype.Output" title="type futures::future::Future::Output">Output</a>>, <a class="struct" href="struct.SpawnError.html" title="struct futures::task::SpawnError">SpawnError</a>>
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<span class="where">where Fut: <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static,
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<Fut as <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a>>::<a class="associatedtype" href="../future/trait.Future.html#associatedtype.Output" title="type futures::future::Future::Output">Output</a>: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a></span> { ... }
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Extension trait for <code>Spawn</code>.</p>
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</div></details><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.spawn" class="method"><a class="src rightside" href="../../src/futures_util/task/spawn.rs.html#49-51">source</a><h4 class="code-header">fn <a href="#method.spawn" class="fn">spawn</a><Fut>(&self, future: Fut) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.unit.html">()</a>, <a class="struct" href="struct.SpawnError.html" title="struct futures::task::SpawnError">SpawnError</a>><div class="where">where
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Fut: <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a><Output = <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.unit.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static,</div></h4></section></summary><div class="docblock"><p>Spawns a task that polls the given future with output <code>()</code> to
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completion.</p>
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<p>This method returns a <a href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result"><code>Result</code></a> that contains a <a href="struct.SpawnError.html" title="struct futures::task::SpawnError"><code>SpawnError</code></a> if
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spawning fails.</p>
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<p>You can use <a href="trait.SpawnExt.html#method.spawn_with_handle" title="method futures::task::SpawnExt::spawn_with_handle"><code>spawn_with_handle</code></a> if
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you want to spawn a future with output other than <code>()</code> or if you want
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to be able to await its completion.</p>
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<p>Note this method will eventually be replaced with the upcoming
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<code>Spawn::spawn</code> method which will take a <code>dyn Future</code> as input.
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Technical limitations prevent <code>Spawn::spawn</code> from being implemented
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today. Feel free to use this method in the meantime.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>futures::executor::ThreadPool;
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<span class="kw">use </span>futures::task::SpawnExt;
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<span class="kw">let </span>executor = ThreadPool::new().unwrap();
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<span class="kw">let </span>future = <span class="kw">async </span>{ <span class="comment">/* ... */ </span>};
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executor.spawn(future).unwrap();</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.spawn_with_handle" class="method"><a class="src rightside" href="../../src/futures_util/task/spawn.rs.html#80-83">source</a><h4 class="code-header">fn <a href="#method.spawn_with_handle" class="fn">spawn_with_handle</a><Fut>(
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&self,
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future: Fut
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) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../future/struct.RemoteHandle.html" title="struct futures::future::RemoteHandle">RemoteHandle</a><<Fut as <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a>>::<a class="associatedtype" href="../future/trait.Future.html#associatedtype.Output" title="type futures::future::Future::Output">Output</a>>, <a class="struct" href="struct.SpawnError.html" title="struct futures::task::SpawnError">SpawnError</a>><div class="where">where
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Fut: <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static,
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<Fut as <a class="trait" href="../future/trait.Future.html" title="trait futures::future::Future">Future</a>>::<a class="associatedtype" href="../future/trait.Future.html#associatedtype.Output" title="type futures::future::Future::Output">Output</a>: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h4></section></summary><div class="docblock"><p>Spawns a task that polls the given future to completion and returns a
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future that resolves to the spawned future’s output.</p>
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<p>This method returns a <a href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result"><code>Result</code></a> that contains a <a href="../future/struct.RemoteHandle.html" title="struct futures::future::RemoteHandle"><code>RemoteHandle</code></a>, or, if
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spawning fails, a <a href="struct.SpawnError.html" title="struct futures::task::SpawnError"><code>SpawnError</code></a>. <a href="../future/struct.RemoteHandle.html" title="struct futures::future::RemoteHandle"><code>RemoteHandle</code></a> is a future that
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resolves to the output of the spawned future.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>futures::executor::{block_on, ThreadPool};
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<span class="kw">use </span>futures::future;
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<span class="kw">use </span>futures::task::SpawnExt;
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<span class="kw">let </span>executor = ThreadPool::new().unwrap();
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<span class="kw">let </span>future = future::ready(<span class="number">1</span>);
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<span class="kw">let </span>join_handle_fut = executor.spawn_with_handle(future).unwrap();
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<span class="macro">assert_eq!</span>(block_on(join_handle_fut), <span class="number">1</span>);</code></pre></div>
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</div></details></div><h2 id="object-safety" class="section-header">Object Safety<a href="#object-safety" class="anchor">§</a></h2><div class="object-safety-info">This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.76.0/reference/items/traits.html#object-safety">object safe</a>.</div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-SpawnExt-for-Sp" class="impl"><a class="src rightside" href="../../src/futures_util/task/spawn.rs.html#16">source</a><a href="#impl-SpawnExt-for-Sp" class="anchor">§</a><h3 class="code-header">impl<Sp> <a class="trait" href="trait.SpawnExt.html" title="trait futures::task::SpawnExt">SpawnExt</a> for Sp<div class="where">where
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Sp: <a class="trait" href="trait.Spawn.html" title="trait futures::task::Spawn">Spawn</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></div><script src="../../trait.impl/futures_util/task/spawn/trait.SpawnExt.js" async></script></section></div></main></body></html> |