<!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 `Future` trait in crate `futures_core`."><meta name="keywords" content="rust, rustlang, rust-lang, Future"><title>futures_core::future::Future - 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 Future</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.Output">Output</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.poll">poll</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-Future-for-%26%27_%20mut%20F">&'_ mut F</a><a href="#impl-Future-for-AssertUnwindSafe%3CF%3E">AssertUnwindSafe<F></a><a href="#impl-Future-for-Box%3CF%3E">Box<F></a><a href="#impl-Future-for-Pending%3CT%3E">Pending<T></a><a href="#impl-Future-for-Pin%3CP%3E">Pin<P></a><a href="#impl-Future-for-PollFn%3CF%3E">PollFn<F></a><a href="#impl-Future-for-Ready%3CT%3E">Ready<T></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: 'Future', 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 class='since' title='Stable since Rust version 1.36.0'>1.36.0</span><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='https://doc.rust-lang.org/nightly/src/core/future/future.rs.html#32-100' 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=''>Future</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'><span class="docblock attributes top-attr">#[must_use = "futures do nothing unless you `.await` or poll them"]
#[lang = "future_trait"]</span>pub trait Future {
type <a href='#associatedtype.Output' class="type">Output</a>;
<span class="docblock attributes">#[lang = "poll"]</span> fn <a href='#tymethod.poll' class='fnname'>poll</a>(self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self>, cx: &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><Self::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a>>;
}</pre></div><div class='docblock'><p>A future represents an asynchronous computation.</p>
<p>A future is a value that may not have finished computing yet. This kind of
"asynchronous value" makes it possible for a thread to continue doing useful
work while it waits for the value to become available.</p>
<h1 id="the-poll-method" class="section-header"><a href="#the-poll-method">The <code>poll</code> method</a></h1>
<p>The core method of future, <code>poll</code>, <em>attempts</em> to resolve the future into a
final value. This method does not block if the value is not ready. Instead,
the current task is scheduled to be woken up when it's possible to make
further progress by <code>poll</code>ing again. The <code>context</code> passed to the <code>poll</code>
method can provide a <a href="../../futures_core/task/struct.Waker.html"><code>Waker</code></a>, which is a handle for waking up the current
task.</p>
<p>When using a future, you generally won't call <code>poll</code> directly, but instead
<code>.await</code> the value.</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.Output' class='method'><code>type <a href='#associatedtype.Output' class="type">Output</a></code></h3><div class='docblock'><p>The type of value produced on completion.</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.poll' class='method'><code><span class="docblock attributes">#[lang = "poll"]</span>fn <a href='#tymethod.poll' class='fnname'>poll</a>(self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>Self>, cx: &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><Self::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a>></code></h3><div class='docblock'><p>Attempt to resolve the future to a final value, registering
the current task for wakeup if the value is not yet available.</p>
<h1 id="return-value" class="section-header"><a href="#return-value">Return value</a></h1>
<p>This function returns:</p>
<ul>
<li><a href="../../futures_core/task/enum.Poll.html#variant.Pending" title="Poll::Pending"><code>Poll::Pending</code></a> if the future is not ready yet</li>
<li><a href="../../futures_core/task/enum.Poll.html#variant.Ready"><code>Poll::Ready(val)</code></a> with the result <code>val</code> of this future if it
finished successfully.</li>
</ul>
<p>Once a future has finished, clients should not <code>poll</code> it again.</p>
<p>When a future is not ready yet, <code>poll</code> returns <code>Poll::Pending</code> and
stores a clone of the <a href="../../futures_core/task/struct.Waker.html"><code>Waker</code></a> copied from the current <a href="../../futures_core/task/struct.Context.html" title="Context"><code>Context</code></a>.
This <a href="../../futures_core/task/struct.Waker.html"><code>Waker</code></a> is then woken once the future can make progress.
For example, a future waiting for a socket to become
readable would call <code>.clone()</code> on the <a href="../../futures_core/task/struct.Waker.html"><code>Waker</code></a> and store it.
When a signal arrives elsewhere indicating that the socket is readable,
<a href="../../futures_core/task/struct.Waker.html#method.wake"><code>Waker::wake</code></a> is called and the socket future's task is awoken.
Once a task has been woken up, it should attempt to <code>poll</code> the future
again, which may or may not produce a final value.</p>
<p>Note that on multiple calls to <code>poll</code>, only the <a href="../../futures_core/task/struct.Waker.html"><code>Waker</code></a> from the
<a href="../../futures_core/task/struct.Context.html" title="Context"><code>Context</code></a> passed to the most recent call should be scheduled to
receive a wakeup.</p>
<h1 id="runtime-characteristics" class="section-header"><a href="#runtime-characteristics">Runtime characteristics</a></h1>
<p>Futures alone are <em>inert</em>; they must be <em>actively</em> <code>poll</code>ed to make
progress, meaning that each time the current task is woken up, it should
actively re-<code>poll</code> pending futures that it still has an interest in.</p>
<p>The <code>poll</code> function is not called repeatedly in a tight loop -- instead,
it should only be called when the future indicates that it is ready to
make progress (by calling <code>wake()</code>). If you're familiar with the
<code>poll(2)</code> or <code>select(2)</code> syscalls on Unix it's worth noting that futures
typically do <em>not</em> suffer the same problems of "all wakeups must poll
all events"; they are more like <code>epoll(4)</code>.</p>
<p>An implementation of <code>poll</code> should strive to return quickly, and should
not block. Returning quickly prevents unnecessarily clogging up
threads or event loops. If it is known ahead of time that a call to
<code>poll</code> may end up taking awhile, the work should be offloaded to a
thread pool (or something similar) to ensure that <code>poll</code> can return
quickly.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>Once a future has completed (returned <code>Ready</code> from <code>poll</code>), calling its
<code>poll</code> method again may panic, block forever, or cause other kinds of
problems; the <code>Future</code> trait places no requirements on the effects of
such a call. However, as the <code>poll</code> method is not marked <code>unsafe</code>,
Rust's usual rules apply: calls must never cause undefined behavior
(memory corruption, incorrect use of <code>unsafe</code> functions, or the like),
regardless of the future's state.</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-Future-for-AssertUnwindSafe%3CF%3E' class='impl'><code class='in-band'>impl<F> <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</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> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>, </span></code><a href='#impl-Future-for-AssertUnwindSafe%3CF%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/panic.rs.html#320-327' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Output-1' class="type"><code>type <a href='#associatedtype.Output' class="type">Output</a> = <F as <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>>::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a></code></h4><h4 id='method.poll' class="method hidden"><code>fn <a href='#method.poll' class='fnname'>poll</a>(<br> self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut <a class="struct" href="https://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html" title="struct std::panic::AssertUnwindSafe">AssertUnwindSafe</a><F>>, <br> cx: &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_><br>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><<<a class="struct" href="https://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html" title="struct std::panic::AssertUnwindSafe">AssertUnwindSafe</a><F> as <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>>::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/panic.rs.html#323-326' title='goto source code'>[src]</a></h4></div><h3 id='impl-Future-for-PollFn%3CF%3E' class='impl'><code class='in-band'>impl<T, F> <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/future/poll_fn/struct.PollFn.html" title="struct core::future::poll_fn::PollFn">PollFn</a><F> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><T>, </span></code><a href='#impl-Future-for-PollFn%3CF%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/poll_fn.rs.html#55-64' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Output-2' class="type"><code>type <a href='#associatedtype.Output' class="type">Output</a> = T</code></h4><h4 id='method.poll-1' class="method hidden"><code>fn <a href='#method.poll' class='fnname'>poll</a>(self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/future/poll_fn/struct.PollFn.html" title="struct core::future::poll_fn::PollFn">PollFn</a><F>>, cx: &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><T></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/poll_fn.rs.html#61-63' title='goto source code'>[src]</a></h4></div><h3 id='impl-Future-for-Pending%3CT%3E' class='impl'><code class='in-band'>impl<T> <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/future/pending/struct.Pending.html" title="struct core::future::pending::Pending">Pending</a><T></code><a href='#impl-Future-for-Pending%3CT%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/pending.rs.html#38-44' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Output-3' class="type"><code>type <a href='#associatedtype.Output' class="type">Output</a> = T</code></h4><h4 id='method.poll-2' class="method hidden"><code>fn <a href='#method.poll' class='fnname'>poll</a>(self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/future/pending/struct.Pending.html" title="struct core::future::pending::Pending">Pending</a><T>>, &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><T></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/pending.rs.html#41-43' title='goto source code'>[src]</a></h4></div><h3 id='impl-Future-for-%26%27_%20mut%20F' class='impl'><code class='in-band'>impl<'_, F> <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F <span class="where fmt-newline">where<br> F: <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.Future.html" title="trait futures_core::future::Future">Future</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-Future-for-%26%27_%20mut%20F' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/future.rs.html#103-109' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Output-4' class="type"><code>type <a href='#associatedtype.Output' class="type">Output</a> = <F as <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>>::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a></code></h4><h4 id='method.poll-3' class="method hidden"><code>fn <a href='#method.poll' class='fnname'>poll</a>(<br> self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F>, <br> cx: &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_><br>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><<<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F as <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>>::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/future.rs.html#106-108' title='goto source code'>[src]</a></h4></div><h3 id='impl-Future-for-Pin%3CP%3E' class='impl'><code class='in-band'>impl<P> <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</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/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a>,<br> <P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a>>::<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.Future.html" title="trait futures_core::future::Future">Future</a>, </span></code><a href='#impl-Future-for-Pin%3CP%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/future.rs.html#112-121' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Output-5' class="type"><code>type <a href='#associatedtype.Output' class="type">Output</a> = <<P as <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a>>::<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> as <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>>::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a></code></h4><h4 id='method.poll-4' class="method hidden"><code>fn <a href='#method.poll' class='fnname'>poll</a>(<br> self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><P>>, <br> cx: &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_><br>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><<<a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><P> as <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>>::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/future.rs.html#118-120' title='goto source code'>[src]</a></h4></div><h3 id='impl-Future-for-Ready%3CT%3E' class='impl'><code class='in-band'>impl<T> <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/future/ready/struct.Ready.html" title="struct core::future::ready::Ready">Ready</a><T></code><a href='#impl-Future-for-Ready%3CT%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/ready.rs.html#18-25' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Output-6' class="type"><code>type <a href='#associatedtype.Output' class="type">Output</a> = T</code></h4><h4 id='method.poll-5' class="method hidden"><code>fn <a href='#method.poll' class='fnname'>poll</a>(self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/future/ready/struct.Ready.html" title="struct core::future::ready::Ready">Ready</a><T>>, _cx: &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><T></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/future/ready.rs.html#22-24' title='goto source code'>[src]</a></h4></div><h3 id='impl-Future-for-Box%3CF%3E' class='impl'><code class='in-band'>impl<F> <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</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> <span class="where fmt-newline">where<br> F: <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.Future.html" title="trait futures_core::future::Future">Future</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-Future-for-Box%3CF%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/boxed.rs.html#1162-1168' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Output-7' class="type"><code>type <a href='#associatedtype.Output' class="type">Output</a> = <F as <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>>::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a></code></h4><h4 id='method.poll-6' class="method hidden"><code>fn <a href='#method.poll' class='fnname'>poll</a>(<br> self: <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><F>>, <br> cx: &mut <a class="struct" href="../../futures_core/task/struct.Context.html" title="struct futures_core::task::Context">Context</a><'_><br>) -> <a class="enum" href="../../futures_core/task/enum.Poll.html" title="enum futures_core::task::Poll">Poll</a><<<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><F> as <a class="trait" href="../../futures_core/future/trait.Future.html" title="trait futures_core::future::Future">Future</a>>::<a class="type" href="../../futures_core/future/trait.Future.html#associatedtype.Output" title="type futures_core::future::Future::Output">Output</a>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/boxed.rs.html#1165-1167' 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 type="text/javascript" src="../../implementors/core/future/future/trait.Future.js" async></script></section><section id="search" class="content hidden"></section><section class="footer"></section><script>window.rootPath = "../../";window.currentCrate = "futures_core";</script><script src="../../main.js"></script><script defer src="../../search-index.js"></script></body></html>