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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="API documentation for the Rust `RwLock` struct in crate `tokio`."><meta name="keywords" content="rust, rustlang, rust-lang, RwLock"><title>tokio::sync::RwLock - 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 id="default-settings"></script><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 struct"><!--[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='../../tokio/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><p class="location">Struct RwLock</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#implementations">Methods</a><div class="sidebar-links"><a href="#method.get_mut">get_mut</a><a href="#method.into_inner">into_inner</a><a href="#method.new">new</a><a href="#method.read">read</a><a href="#method.try_read">try_read</a><a href="#method.try_write">try_write</a><a href="#method.write">write</a></div><a class="sidebar-title" href="#trait-implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Default">Default</a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-RefUnwindSafe">!RefUnwindSafe</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">UnwindSafe</a></div><a class="sidebar-title" href="#blanket-implementations">Blanket Implementations</a><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow%3CT%3E">Borrow<T></a><a href="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><a href="#impl-From%3C!%3E">From<!></a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-Into%3CU%3E">Into<U></a><a href="#impl-TryFrom%3CU%3E">TryFrom<U></a><a href="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><p class="location"><a href="../index.html">tokio</a>::<wbr><a href="index.html">sync</a></p><div id="sidebar-vars" data-name="RwLock" data-ty="struct" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></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><button type="button" class="help-button">?</button>
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<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="in-band">Struct <a href="../index.html">tokio</a>::<wbr><a href="index.html">sync</a>::<wbr><a class="struct" href="">RwLock</a></span><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/tokio/sync/rwlock.rs.html#79-85" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust struct">pub struct RwLock<T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> { /* fields omitted */ }</pre></div><div class="docblock"><p>An asynchronous reader-writer lock.</p>
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<p>This type of lock allows a number of readers or at most one writer at any
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point in time. The write portion of this lock typically allows modification
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of the underlying data (exclusive access) and the read portion of this lock
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typically allows for read-only access (shared access).</p>
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<p>In comparison, a <a href="../../tokio/sync/struct.Mutex.html"><code>Mutex</code></a> does not distinguish between readers or writers
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that acquire the lock, therefore causing any tasks waiting for the lock to
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become available to yield. An <code>RwLock</code> will allow any number of readers to
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acquire the lock as long as a writer is not holding the lock.</p>
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<p>The priority policy of Tokio's read-write lock is <em>fair</em> (or
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<a href="https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock#Priority_policies"><em>write-preferring</em></a>), in order to ensure that readers cannot starve
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writers. Fairness is ensured using a first-in, first-out queue for the tasks
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awaiting the lock; if a task that wishes to acquire the write lock is at the
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head of the queue, read locks will not be given out until the write lock has
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been released. This is in contrast to the Rust standard library's
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<code>std::sync::RwLock</code>, where the priority policy is dependent on the
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operating system's implementation.</p>
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<p>The type parameter <code>T</code> represents the data that this lock protects. It is
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required that <code>T</code> satisfies <a href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"><code>Send</code></a> to be shared across threads. The RAII guards
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returned from the locking methods implement <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html"><code>Deref</code></a>
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(and <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html"><code>DerefMut</code></a>
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for the <code>write</code> methods) to allow access to the content of the lock.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">sync</span>::<span class="ident">RwLock</span>;
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<span class="attribute">#[<span class="ident">tokio</span>::<span class="ident">main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">RwLock</span>::<span class="ident">new</span>(<span class="number">5</span>);
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<span class="comment">// many reader locks can be held at once</span>
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{
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<span class="kw">let</span> <span class="ident">r1</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">read</span>().<span class="kw">await</span>;
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<span class="kw">let</span> <span class="ident">r2</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">read</span>().<span class="kw">await</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">r1</span>, <span class="number">5</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">r2</span>, <span class="number">5</span>);
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} <span class="comment">// read locks are dropped at this point</span>
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<span class="comment">// only one write lock may be held, however</span>
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{
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">write</span>().<span class="kw">await</span>;
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<span class="kw-2">*</span><span class="ident">w</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">w</span>, <span class="number">6</span>);
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} <span class="comment">// write lock is dropped here</span>
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}</pre></div>
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</div><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><h3 id="impl" class="impl"><code class="in-band">impl<T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T></code><a href="#impl" class="anchor"></a><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#132-374" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.new" class="method"><code>pub fn <a href="#method.new" class="fnname">new</a>(value: T) -> <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T> <span class="where fmt-newline">where<br> T: <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 class="srclink" href="../../src/tokio/sync/rwlock.rs.html#142-150" title="goto source code">[src]</a></h4><div class="docblock"><p>Creates a new instance of an <code>RwLock<T></code> which is unlocked.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">sync</span>::<span class="ident">RwLock</span>;
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">RwLock</span>::<span class="ident">new</span>(<span class="number">5</span>);</pre></div>
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</div><h4 id="method.read" class="method"><code>pub async fn <a href="#method.read" class="fnname">read</a>(&self) -> <a class="struct" href="../../tokio/sync/struct.RwLockReadGuard.html" title="struct tokio::sync::RwLockReadGuard">RwLockReadGuard</a><'_, T></code><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#212-223" title="goto source code">[src]</a></h4><div class="docblock"><p>Locks this <code>RwLock</code> with shared read access, causing the current task
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to yield until the lock has been acquired.</p>
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<p>The calling task will yield until there are no writers which hold the
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lock. There may be other readers inside the lock when the task resumes.</p>
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<p>Note that under the priority policy of <a href="../../tokio/sync/struct.RwLock.html" title="RwLock"><code>RwLock</code></a>, read locks are not
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granted until prior write locks, to prevent starvation. Therefore
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deadlock may occur if a read lock is held by the current task, a write
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lock attempt is made, and then a subsequent read lock attempt is made
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by the current task.</p>
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<p>Returns an RAII guard which will drop this read access of the <code>RwLock</code>
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when dropped.</p>
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<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">sync</span>::<span class="ident">RwLock</span>;
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<span class="attribute">#[<span class="ident">tokio</span>::<span class="ident">main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">RwLock</span>::<span class="ident">new</span>(<span class="number">1</span>));
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<span class="kw">let</span> <span class="ident">c_lock</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">clone</span>();
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<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">read</span>().<span class="kw">await</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">n</span>, <span class="number">1</span>);
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<span class="ident">tokio</span>::<span class="ident">spawn</span>(<span class="kw">async</span> <span class="kw">move</span> {
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<span class="comment">// While main has an active read lock, we acquire one too.</span>
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<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">c_lock</span>.<span class="ident">read</span>().<span class="kw">await</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">r</span>, <span class="number">1</span>);
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}).<span class="kw">await</span>.<span class="ident">expect</span>(<span class="string">"The spawned task has panicked"</span>);
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<span class="comment">// Drop the guard after the spawned task finishes.</span>
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<span class="ident">drop</span>(<span class="ident">n</span>);
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}</pre></div>
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</div><h4 id="method.try_read" class="method"><code>pub fn <a href="#method.try_read" class="fnname">try_read</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../../tokio/sync/struct.RwLockReadGuard.html" title="struct tokio::sync::RwLockReadGuard">RwLockReadGuard</a><'_, T>, <a class="struct" href="../../tokio/sync/struct.TryLockError.html" title="struct tokio::sync::TryLockError">TryLockError</a>></code><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#257-269" title="goto source code">[src]</a></h4><div class="docblock"><p>Attempts to acquire this <code>RwLock</code> with shared read access.</p>
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<p>If the access couldn't be acquired immediately, returns <a href="../../tokio/sync/struct.TryLockError.html"><code>TryLockError</code></a>.
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Otherwise, an RAII guard is returned which will release read access
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when dropped.</p>
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<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">sync</span>::<span class="ident">RwLock</span>;
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<span class="attribute">#[<span class="ident">tokio</span>::<span class="ident">main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">RwLock</span>::<span class="ident">new</span>(<span class="number">1</span>));
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<span class="kw">let</span> <span class="ident">c_lock</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">clone</span>();
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<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">try_read</span>().<span class="ident">unwrap</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">v</span>, <span class="number">1</span>);
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<span class="ident">tokio</span>::<span class="ident">spawn</span>(<span class="kw">async</span> <span class="kw">move</span> {
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<span class="comment">// While main has an active read lock, we acquire one too.</span>
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<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">c_lock</span>.<span class="ident">read</span>().<span class="kw">await</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">n</span>, <span class="number">1</span>);
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}).<span class="kw">await</span>.<span class="ident">expect</span>(<span class="string">"The spawned task has panicked"</span>);
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<span class="comment">// Drop the guard when spawned task finishes.</span>
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<span class="ident">drop</span>(<span class="ident">v</span>);
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}</pre></div>
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</div><h4 id="method.write" class="method"><code>pub async fn <a href="#method.write" class="fnname">write</a>(&self) -> <a class="struct" href="../../tokio/sync/struct.RwLockWriteGuard.html" title="struct tokio::sync::RwLockWriteGuard">RwLockWriteGuard</a><'_, T></code><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#293-304" title="goto source code">[src]</a></h4><div class="docblock"><p>Locks this <code>RwLock</code> with exclusive write access, causing the current
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task to yield until the lock has been acquired.</p>
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<p>The calling task will yield while other writers or readers currently
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have access to the lock.</p>
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<p>Returns an RAII guard which will drop the write access of this <code>RwLock</code>
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when dropped.</p>
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<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">sync</span>::<span class="ident">RwLock</span>;
|
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<span class="attribute">#[<span class="ident">tokio</span>::<span class="ident">main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">RwLock</span>::<span class="ident">new</span>(<span class="number">1</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">write</span>().<span class="kw">await</span>;
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<span class="kw-2">*</span><span class="ident">n</span> <span class="op">=</span> <span class="number">2</span>;
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}</pre></div>
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</div><h4 id="method.try_write" class="method"><code>pub fn <a href="#method.try_write" class="fnname">try_write</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../../tokio/sync/struct.RwLockWriteGuard.html" title="struct tokio::sync::RwLockWriteGuard">RwLockWriteGuard</a><'_, T>, <a class="struct" href="../../tokio/sync/struct.TryLockError.html" title="struct tokio::sync::TryLockError">TryLockError</a>></code><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#329-341" title="goto source code">[src]</a></h4><div class="docblock"><p>Attempts to acquire this <code>RwLock</code> with exclusive write access.</p>
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<p>If the access couldn't be acquired immediately, returns <a href="../../tokio/sync/struct.TryLockError.html"><code>TryLockError</code></a>.
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Otherwise, an RAII guard is returned which will release write access
|
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when dropped.</p>
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<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
|
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<div class="example-wrap"><pre class="rust rust-example-rendered">
|
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">sync</span>::<span class="ident">RwLock</span>;
|
||
|
||
<span class="attribute">#[<span class="ident">tokio</span>::<span class="ident">main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">rw</span> <span class="op">=</span> <span class="ident">RwLock</span>::<span class="ident">new</span>(<span class="number">1</span>);
|
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<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">rw</span>.<span class="ident">read</span>().<span class="kw">await</span>;
|
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">v</span>, <span class="number">1</span>);
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rw</span>.<span class="ident">try_write</span>().<span class="ident">is_err</span>());
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}</pre></div>
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</div><h4 id="method.get_mut" class="method"><code>pub fn <a href="#method.get_mut" class="fnname">get_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T<span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<div class="notable-traits-tooltiptext"><span class="docblock"><h3 class="notable">Notable traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F</h3><code class="content"><span class="where fmt-newline">impl<'_, F> <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::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="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::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></span><span class="where fmt-newline"> type <a href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" class="type">Output</a> = <F as <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" title="type core::future::future::Future::Output">Output</a>;</span></code></span></div></span></span></code><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#360-365" title="goto source code">[src]</a></h4><div class="docblock"><p>Returns a mutable reference to the underlying data.</p>
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||
<p>Since this call borrows the <code>RwLock</code> mutably, no actual locking needs to
|
||
take place -- the mutable borrow statically guarantees no locks exist.</p>
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||
<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
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||
<div class="example-wrap"><pre class="rust rust-example-rendered">
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||
<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">sync</span>::<span class="ident">RwLock</span>;
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||
|
||
<span class="kw">fn</span> <span class="ident">main</span>() {
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||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">RwLock</span>::<span class="ident">new</span>(<span class="number">1</span>);
|
||
|
||
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">get_mut</span>();
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||
<span class="kw-2">*</span><span class="ident">n</span> <span class="op">=</span> <span class="number">2</span>;
|
||
}</pre></div>
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||
</div><h4 id="method.into_inner" class="method"><code>pub fn <a href="#method.into_inner" class="fnname">into_inner</a>(self) -> T <span class="where fmt-newline">where<br> T: <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 class="srclink" href="../../src/tokio/sync/rwlock.rs.html#368-373" title="goto source code">[src]</a></h4><div class="docblock"><p>Consumes the lock, returning the underlying data.</p>
|
||
</div></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><h3 id="impl-Debug" class="impl"><code class="in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</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/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T></code><a href="#impl-Debug" class="anchor"></a><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#78" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.fmt" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt" class="fnname">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#78" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
|
||
</div></div><h3 id="impl-Default" class="impl"><code class="in-band">impl<T: ?<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/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code><a href="#impl-Default" class="anchor"></a><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#382-389" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.default" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default" class="fnname">default</a>() -> Self</code><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#386-388" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Returns the "default value" for a type. <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default">Read more</a></p>
|
||
</div></div><h3 id="impl-From%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T></code><a href="#impl-From%3CT%3E" class="anchor"></a><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#376-380" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(s: T) -> Self</code><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#377-379" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
|
||
</div></div><h3 id="impl-Send" class="impl"><code class="in-band">impl<T: ?<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.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code><a href="#impl-Send" class="anchor"></a><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#116" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Sync" class="impl"><code class="in-band">impl<T: ?<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.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>, </span></code><a href="#impl-Sync" class="anchor"></a><a class="srclink" href="../../src/tokio/sync/rwlock.rs.html#117" title="goto source code">[src]</a></h3><div class="impl-items"></div></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><h3 id="impl-RefUnwindSafe" class="impl"><code class="in-band">impl<T> !<a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.RefUnwindSafe.html" title="trait std::panic::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T></code><a href="#impl-RefUnwindSafe" class="anchor"></a><a class="srclink" href="../../src/tokio/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Unpin" class="impl"><code class="in-band">impl<T: ?<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> for <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>, </span></code><a href="#impl-Unpin" class="anchor"></a><a class="srclink" href="../../src/tokio/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-UnwindSafe" class="impl"><code class="in-band">impl<T: ?<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/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a> for <a class="struct" href="../../tokio/sync/struct.RwLock.html" title="struct tokio::sync::RwLock">RwLock</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a>, </span></code><a href="#impl-UnwindSafe" class="anchor"></a><a class="srclink" href="../../src/tokio/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><h3 id="impl-Any" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br> T: 'static + ?<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-Any" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#131-135" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.type_id" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#132" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
|
||
</div></div><h3 id="impl-Borrow%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T <span class="where fmt-newline">where<br> T: ?<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-Borrow%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#207-211" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T<span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<div class="notable-traits-tooltiptext"><span class="docblock"><h3 class="notable">Notable traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F</h3><code class="content"><span class="where fmt-newline">impl<'_, F> <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::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="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::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></span><span class="where fmt-newline"> type <a href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" class="type">Output</a> = <F as <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" title="type core::future::future::Future::Output">Output</a>;</span></code></span></div></span></span></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#208" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
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||
</div></div><h3 id="impl-BorrowMut%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <span class="where fmt-newline">where<br> T: ?<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-BorrowMut%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214-218" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow_mut" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T<span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<div class="notable-traits-tooltiptext"><span class="docblock"><h3 class="notable">Notable traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>F</h3><code class="content"><span class="where fmt-newline">impl<'_, F> <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::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="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::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></span><span class="where fmt-newline"> type <a href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" class="type">Output</a> = <F as <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" title="type core::future::future::Future::Output">Output</a>;</span></code></span></div></span></span></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#215" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
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||
</div></div><h3 id="impl-From%3C!%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.never.html">!</a>> for T</code><a href="#impl-From%3C!%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#560-564" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from-1" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.never.html">!</a>) -> T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#561" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
|
||
</div></div><h3 id="impl-From%3CT%3E-1" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</code><a href="#impl-From%3CT%3E-1" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#545-549" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from-2" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#546" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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||
</div></div><h3 id="impl-Into%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>, </span></code><a href="#impl-Into%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#534-541" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> U</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#538" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-TryFrom%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>, </span></code><a href="#impl-TryFrom%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#582-591" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="type">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id="method.try_from" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#588" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-TryInto%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><a href="#impl-TryInto%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#568-577" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error-1" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="type">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id="method.try_into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#574" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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