<!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 `FusedFuture` trait in crate `futures_core`."><meta name="keywords" content="rust, rustlang, rust-lang, FusedFuture"><title>futures_core::future::FusedFuture - 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 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">☰</div><a href='../../futures_core/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><p class='location'>Trait FusedFuture</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.is_terminated">is_terminated</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-FusedFuture-for-%26%27_%20mut%20F">&'_ mut F</a><a href="#impl-FusedFuture-for-AssertUnwindSafe%3CF%3E">AssertUnwindSafe<F></a><a href="#impl-FusedFuture-for-Box%3CF%3E">Box<F></a><a href="#impl-FusedFuture-for-Pin%3CP%3E">Pin<P></a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>futures_core</a>::<wbr><a href='index.html'>future</a></p><script>window.sidebarCurrent = {name: 'FusedFuture', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></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><span class="help-button">?</span>
<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='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/futures_core/future.rs.html#26-29' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>futures_core</a>::<wbr><a href='index.html'>future</a>::<wbr><a class="trait" href=''>FusedFuture</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait FusedFuture: <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a> {
fn <a href='#tymethod.is_terminated' class='fnname'>is_terminated</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>;
}</pre></div><div class='docblock'><p>A future which tracks whether or not the underlying future
should no longer be polled.</p>
<p><code>is_terminated</code> will return <code>true</code> if a future should no longer be polled.
Usually, this state occurs after <code>poll</code> (or <code>try_poll</code>) returned
<code>Poll::Ready</code>. However, <code>is_terminated</code> may also return <code>true</code> if a future
has become inactive and can no longer make progress and should be ignored
or dropped rather than being <code>poll</code>ed again.</p>
</div><h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.is_terminated' class='method'><code>fn <a href='#tymethod.is_terminated' class='fnname'>is_terminated</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></h3><div class='docblock'><p>Returns <code>true</code> if the underlying future should no longer be polled.</p>
</div></div><span class='loading-content'>Loading content...</span><h2 id='foreign-impls' class='small-section-header'>Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a></h2><h3 id='impl-FusedFuture-for-%26%27_%20mut%20F' class='impl'><code class='in-band'>impl<F: <a class="trait" href="../../futures_core/future/trait.FusedFuture.html" title="trait futures_core::future::FusedFuture">FusedFuture</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>, '_> <a class="trait" href="../../futures_core/future/trait.FusedFuture.html" title="trait futures_core::future::FusedFuture">FusedFuture</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F</code><a href='#impl-FusedFuture-for-%26%27_%20mut%20F' class='anchor'></a><a class='srclink' href='../../src/futures_core/future.rs.html#31-35' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.is_terminated' class="method hidden"><code>fn <a href='#method.is_terminated' class='fnname'>is_terminated</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><a class='srclink' href='../../src/futures_core/future.rs.html#32-34' title='goto source code'>[src]</a></h4></div><h3 id='impl-FusedFuture-for-Pin%3CP%3E' class='impl'><code class='in-band'>impl<P> <a class="trait" href="../../futures_core/future/trait.FusedFuture.html" title="trait futures_core::future::FusedFuture">FusedFuture</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><P> <span class="where fmt-newline">where<br> P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,<br> P::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a>: <a class="trait" href="../../futures_core/future/trait.FusedFuture.html" title="trait futures_core::future::FusedFuture">FusedFuture</a>, </span></code><a href='#impl-FusedFuture-for-Pin%3CP%3E' class='anchor'></a><a class='srclink' href='../../src/futures_core/future.rs.html#37-45' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.is_terminated-1' class="method hidden"><code>fn <a href='#method.is_terminated' class='fnname'>is_terminated</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><a class='srclink' href='../../src/futures_core/future.rs.html#42-44' title='goto source code'>[src]</a></h4></div><h3 id='impl-FusedFuture-for-Box%3CF%3E' class='impl'><code class='in-band'>impl<F: <a class="trait" href="../../futures_core/future/trait.FusedFuture.html" title="trait futures_core::future::FusedFuture">FusedFuture</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>> <a class="trait" href="../../futures_core/future/trait.FusedFuture.html" title="trait futures_core::future::FusedFuture">FusedFuture</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><F></code><a href='#impl-FusedFuture-for-Box%3CF%3E' class='anchor'></a><a class='srclink' href='../../src/futures_core/future.rs.html#92-96' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.is_terminated-2' class="method hidden"><code>fn <a href='#method.is_terminated' class='fnname'>is_terminated</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><a class='srclink' href='../../src/futures_core/future.rs.html#93-95' title='goto source code'>[src]</a></h4></div><h3 id='impl-FusedFuture-for-AssertUnwindSafe%3CF%3E' class='impl'><code class='in-band'>impl<F: <a class="trait" href="../../futures_core/future/trait.FusedFuture.html" title="trait futures_core::future::FusedFuture">FusedFuture</a>> <a class="trait" href="../../futures_core/future/trait.FusedFuture.html" title="trait futures_core::future::FusedFuture">FusedFuture</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html" title="struct std::panic::AssertUnwindSafe">AssertUnwindSafe</a><F></code><a href='#impl-FusedFuture-for-AssertUnwindSafe%3CF%3E' class='anchor'></a><a class='srclink' href='../../src/futures_core/future.rs.html#99-103' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.is_terminated-3' class="method hidden"><code>fn <a href='#method.is_terminated' class='fnname'>is_terminated</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><a class='srclink' href='../../src/futures_core/future.rs.html#100-102' title='goto source code'>[src]</a></h4></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'></div><span class='loading-content'>Loading content...</span><script 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