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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 synchronization primitive for task wakeup."><title>AtomicWaker in futures_util::task - 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-492a78a4a87dcc01.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="1.82.0 (f6e511eec 2024-10-15)" data-channel="1.82.0" data-search-js="search-a99f1315e7cc5121.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-921df33f47b8780c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-3b12f09e550e0385.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 struct"><!--[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><h2 class="location"><a href="#">Atomic<wbr>Waker</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.new">new</a></li><li><a href="#method.register">register</a></li><li><a href="#method.take">take</a></li><li><a href="#method.wake">wake</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-AtomicWaker">Debug</a></li><li><a href="#impl-Default-for-AtomicWaker">Default</a></li><li><a href="#impl-Send-for-AtomicWaker">Send</a></li><li><a href="#impl-Sync-for-AtomicWaker">Sync</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-AtomicWaker">!Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-AtomicWaker">!RefUnwindSafe</a></li><li><a href="#impl-Unpin-for-AtomicWaker">Unpin</a></li><li><a href="#impl-UnwindSafe-for-AtomicWaker">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-T">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto<U></a></li></ul></section><h2><a href="index.html">In futures_<wbr>util::<wbr>task</a></h2></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"><h1>Struct <a href="../index.html">futures_util</a>::<wbr><a href="index.html">task</a>::<wbr><a class="struct" href="#">AtomicWaker</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#96">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub struct AtomicWaker { <span class="comment">/* private fields */</span> }</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A synchronization primitive for task wakeup.</p>
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<p>Sometimes the task interested in a given event will change over time.
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An <code>AtomicWaker</code> can coordinate concurrent notifications with the consumer
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potentially “updating” the underlying task to wake up. This is useful in
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scenarios where a computation completes in another thread and wants to
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notify the consumer, but the consumer is in the process of being migrated to
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a new logical task.</p>
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<p>Consumers should call <code>register</code> before checking the result of a computation
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and producers should call <code>wake</code> after producing the computation (this
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differs from the usual <code>thread::park</code> pattern). It is also permitted for
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<code>wake</code> to be called <strong>before</strong> <code>register</code>. This results in a no-op.</p>
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<p>A single <code>AtomicWaker</code> may be reused for any number of calls to <code>register</code> or
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<code>wake</code>.</p>
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<h2 id="memory-ordering"><a class="doc-anchor" href="#memory-ordering">§</a>Memory ordering</h2>
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<p>Calling <code>register</code> “acquires” all memory “released” by calls to <code>wake</code>
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before the call to <code>register</code>. Later calls to <code>wake</code> will wake the
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registered waker (on contention this wake might be triggered in <code>register</code>).</p>
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<p>For concurrent calls to <code>register</code> (should be avoided) the ordering is only
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guaranteed for the winning call.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<p>Here is a simple example providing a <code>Flag</code> that can be signalled manually
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when it is ready.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>futures::future::Future;
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<span class="kw">use </span>futures::task::{Context, Poll, AtomicWaker};
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<span class="kw">use </span>std::sync::Arc;
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<span class="kw">use </span>std::sync::atomic::AtomicBool;
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<span class="kw">use </span>std::sync::atomic::Ordering::Relaxed;
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<span class="kw">use </span>std::pin::Pin;
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<span class="kw">struct </span>Inner {
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waker: AtomicWaker,
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set: AtomicBool,
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}
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<span class="attr">#[derive(Clone)]
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</span><span class="kw">struct </span>Flag(Arc<Inner>);
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<span class="kw">impl </span>Flag {
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<span class="kw">pub fn </span>new() -> <span class="self">Self </span>{
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<span class="self">Self</span>(Arc::new(Inner {
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waker: AtomicWaker::new(),
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set: AtomicBool::new(<span class="bool-val">false</span>),
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}))
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}
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<span class="kw">pub fn </span>signal(<span class="kw-2">&</span><span class="self">self</span>) {
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<span class="self">self</span>.<span class="number">0</span>.set.store(<span class="bool-val">true</span>, Relaxed);
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<span class="self">self</span>.<span class="number">0</span>.waker.wake();
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}
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}
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<span class="kw">impl </span>Future <span class="kw">for </span>Flag {
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<span class="kw">type </span>Output = ();
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<span class="kw">fn </span>poll(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<()> {
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<span class="comment">// quick check to avoid registration if already done.
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</span><span class="kw">if </span><span class="self">self</span>.<span class="number">0</span>.set.load(Relaxed) {
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<span class="kw">return </span>Poll::Ready(());
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}
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<span class="self">self</span>.<span class="number">0</span>.waker.register(cx.waker());
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<span class="comment">// Need to check condition **after** `register` to avoid a race
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// condition that would result in lost notifications.
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</span><span class="kw">if </span><span class="self">self</span>.<span class="number">0</span>.set.load(Relaxed) {
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Poll::Ready(())
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} <span class="kw">else </span>{
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Poll::Pending
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}
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}
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}</code></pre></div>
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</div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-AtomicWaker" class="impl"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#205">source</a><a href="#impl-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#207">source</a><h4 class="code-header">pub const fn <a href="#method.new" class="fn">new</a>() -> <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h4></section></summary><div class="docblock"><p>Create an <code>AtomicWaker</code>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.register" class="method"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#266">source</a><h4 class="code-header">pub fn <a href="#method.register" class="fn">register</a>(&self, waker: &<a class="struct" href="https://doc.rust-lang.org/1.82.0/core/task/wake/struct.Waker.html" title="struct core::task::wake::Waker">Waker</a>)</h4></section></summary><div class="docblock"><p>Registers the waker to be notified on calls to <code>wake</code>.</p>
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<p>The new task will take place of any previous tasks that were registered
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by previous calls to <code>register</code>. Any calls to <code>wake</code> that happen after
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a call to <code>register</code> (as defined by the memory ordering rules), will
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notify the <code>register</code> caller’s task and deregister the waker from future
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notifications. Because of this, callers should ensure <code>register</code> gets
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invoked with a new <code>Waker</code> <strong>each</strong> time they require a wakeup.</p>
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<p>It is safe to call <code>register</code> with multiple other threads concurrently
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calling <code>wake</code>. This will result in the <code>register</code> caller’s current
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task being notified once.</p>
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<p>This function is safe to call concurrently, but this is generally a bad
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idea. Concurrent calls to <code>register</code> will attempt to register different
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tasks to be notified. One of the callers will win and have its task set,
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but there is no guarantee as to which caller will succeed.</p>
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<h5 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h5>
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<p>Here is how <code>register</code> is used when implementing a flag.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>futures::future::Future;
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<span class="kw">use </span>futures::task::{Context, Poll, AtomicWaker};
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<span class="kw">use </span>std::sync::atomic::AtomicBool;
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<span class="kw">use </span>std::sync::atomic::Ordering::Relaxed;
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<span class="kw">use </span>std::pin::Pin;
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<span class="kw">struct </span>Flag {
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waker: AtomicWaker,
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set: AtomicBool,
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}
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<span class="kw">impl </span>Future <span class="kw">for </span>Flag {
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<span class="kw">type </span>Output = ();
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<span class="kw">fn </span>poll(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<()> {
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<span class="comment">// Register **before** checking `set` to avoid a race condition
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// that would result in lost notifications.
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</span><span class="self">self</span>.waker.register(cx.waker());
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<span class="kw">if </span><span class="self">self</span>.set.load(Relaxed) {
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Poll::Ready(())
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} <span class="kw">else </span>{
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Poll::Pending
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}
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}
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}</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.wake" class="method"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#364">source</a><h4 class="code-header">pub fn <a href="#method.wake" class="fn">wake</a>(&self)</h4></section></summary><div class="docblock"><p>Calls <code>wake</code> on the last <code>Waker</code> passed to <code>register</code>.</p>
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<p>If <code>register</code> has not been called yet, then this does nothing.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.take" class="method"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#378">source</a><h4 class="code-header">pub fn <a href="#method.take" class="fn">take</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="https://doc.rust-lang.org/1.82.0/core/task/wake/struct.Waker.html" title="struct core::task::wake::Waker">Waker</a>></h4></section></summary><div class="docblock"><p>Returns the last <code>Waker</code> passed to <code>register</code>, so that the user can wake it.</p>
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<p>Sometimes, just waking the AtomicWaker is not fine grained enough. This allows the user
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to take the waker and then wake it separately, rather than performing both steps in one
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atomic action.</p>
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<p>If a waker has not been registered, this returns <code>None</code>.</p>
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</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-AtomicWaker" class="impl"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#415">source</a><a href="#impl-Debug-for-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#416">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-AtomicWaker" class="impl"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#409">source</a><a href="#impl-Default-for-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#410">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -> <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><section id="impl-Send-for-AtomicWaker" class="impl"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#421">source</a><a href="#impl-Send-for-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section><section id="impl-Sync-for-AtomicWaker" class="impl"><a class="src rightside" href="../../src/futures_core/task/__internal/atomic_waker.rs.html#422">source</a><a href="#impl-Sync-for-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-AtomicWaker" class="impl"><a href="#impl-Freeze-for-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section><section id="impl-RefUnwindSafe-for-AtomicWaker" class="impl"><a href="#impl-RefUnwindSafe-for-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section><section id="impl-Unpin-for-AtomicWaker" class="impl"><a href="#impl-Unpin-for-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section><section id="impl-UnwindSafe-for-AtomicWaker" class="impl"><a href="#impl-UnwindSafe-for-AtomicWaker" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.AtomicWaker.html" title="struct futures_util::task::AtomicWaker">AtomicWaker</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/any.rs.html#138">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/any.rs.html#139">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.82.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#209">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#211">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#217">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/borrow.rs.html#218">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code><a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#809">source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#794">source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html> |