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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 `ShardedLock` struct in crate `crossbeam`."><meta name="keywords" content="rust, rustlang, rust-lang, ShardedLock"><title>crossbeam::sync::ShardedLock - 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="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><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='../../crossbeam/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a><p class='location'>Struct ShardedLock</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">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.is_poisoned">is_poisoned</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="#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-RefUnwindSafe">RefUnwindSafe</a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a><a href="#impl-UnwindSafe">UnwindSafe</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Unpin">Unpin</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%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'>crossbeam</a>::<wbr><a href='index.html'>sync</a></p><script>window.sidebarCurrent = {name: 'ShardedLock', ty: 'struct', 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 js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#75-81' title='goto source code'>[src]</a></span><span class='in-band'>Struct <a href='../index.html'>crossbeam</a>:
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<p>This lock is equivalent to <a href="https://doc.rust-lang.org/std/sync/struct.RwLock.html"><code>RwLock</code></a>, except read operations are faster and write operations
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are slower.</p>
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<p>A <code>ShardedLock</code> is internally made of a list of <em>shards</em>, each being a <a href="https://doc.rust-lang.org/std/sync/struct.RwLock.html"><code>RwLock</code></a> occupying a
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single cache line. Read operations will pick one of the shards depending on the current thread
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and lock it. Write operations need to lock all shards in succession.</p>
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<p>By splitting the lock into shards, concurrent read operations will in most cases choose
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different shards and thus update different cache lines, which is good for scalability. However,
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write operations need to do more work and are therefore slower than usual.</p>
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<p>The priority policy of the lock is dependent on the underlying operating system's
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implementation, and this type does not guarantee that any particular policy will be used.</p>
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<h1 id="poisoning" class="section-header"><a href="#poisoning">Poisoning</a></h1>
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<p>A <code>ShardedLock</code>, like <a href="https://doc.rust-lang.org/std/sync/struct.RwLock.html"><code>RwLock</code></a>, will become poisoned on a panic. Note that it may only be
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poisoned if a panic occurs while a write operation is in progress. If a panic occurs in any
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read operation, the lock will not be poisoned.</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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">ShardedLock</span>::<span class="ident">new</span>(<span class="number">5</span>);
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<span class="comment">// Any number of read 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="ident">unwrap</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="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">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">// However, only one write lock may be held.</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="ident">unwrap</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></pre></div>
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</div><h2 id='methods' class='small-section-header'>Methods<a href='#methods' class='anchor'></a></h2><h3 id='impl' class='impl'><code class='in-band'>impl<T> <a class="struct" href="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</a><T></code><a href='#impl' class='anchor'></a><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#89-139' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.new' class="method"><code id='new.v'>pub fn <a href='#method.new' class='fnname'>new</a>(value: T) -> <a class="struct" href="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</a><T></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#99-110' title='goto source code'>[src]</a></h4><div class='docblock'><p>Creates a new sharded reader-writer lock.</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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">ShardedLock</span>::<span class="ident">new</span>(<span class="number">5</span>);</pre></div>
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</div><h4 id='method.into_inner' class="method"><code id='into_inner.v'>pub fn <a href='#method.into_inner' class='fnname'>into_inner</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/struct.PoisonError.html" title="struct std::sys_common::poison::PoisonError">PoisonError</a><T>></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#129-138' title='goto source code'>[src]</a></h4><div class='docblock'><p>Consumes this lock, returning the underlying data.</p>
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<p>This method will return an error if the lock is poisoned. A lock gets poisoned when a write
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operation panics.</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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">ShardedLock</span>::<span class="ident">new</span>(<span class="ident">String</span>::<span class="ident">new</span>());
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{
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">write</span>().<span class="ident">unwrap</span>();
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<span class="kw-2">*</span><span class="ident">s</span> <span class="op">=</span> <span class="string">"modified"</span>.<span class="ident">to_owned</span>();
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}
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">lock</span>.<span class="ident">into_inner</span>().<span class="ident">unwrap</span>(), <span class="string">"modified"</span>);</pre></div>
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</div></div><h3 id='impl-1' class='impl'><code class='in-band'>impl<T> <a class="struct" href="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</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 href='#impl-1' class='anchor'></a><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#141-414' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.is_poisoned' class="method"><code id='is_poisoned.v'>pub fn <a href='#method.is_poisoned' class='fnname'>is_poisoned</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#163-165' title='goto source code'>[src]</a></h4><div class='docblock'><p>Returns <code>true</code> if the lock is poisoned.</p>
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<p>If another thread can still access the lock, it may become poisoned at any time. A <code>false</code>
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result should not be trusted without additional synchronization.</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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
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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">std</span>::<span class="ident">thread</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">ShardedLock</span>::<span class="ident">new</span>(<span class="number">0</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="kw">_</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">|</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="ident">_lock</span> <span class="op">=</span> <span class="ident">c_lock</span>.<span class="ident">write</span>().<span class="ident">unwrap</span>();
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<span class="macro">panic</span><span class="macro">!</span>(); <span class="comment">// the lock gets poisoned</span>
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}).<span class="ident">join</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">lock</span>.<span class="ident">is_poisoned</span>(), <span class="bool-val">true</span>);</pre></div>
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</div><h4 id='method.get_mut' class="method"><code id='get_mut.v'>pub fn <a href='#method.get_mut' class='fnname'>get_mut</a>(&mut 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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T, <a class="struct" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/struct.PoisonError.html" title="struct std::sys_common::poison::PoisonError">PoisonError</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T>></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#183-192' 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 lock mutably, no actual locking needs to take place.</p>
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<p>This method will return an error if the lock is poisoned. A lock gets poisoned when a write
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operation panics.</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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</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">ShardedLock</span>::<span class="ident">new</span>(<span class="number">0</span>);
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<span class="kw-2">*</span><span class="ident">lock</span>.<span class="ident">get_mut</span>().<span class="ident">unwrap</span>() <span class="op">=</span> <span class="number">10</span>;
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">lock</span>.<span class="ident">read</span>().<span class="ident">unwrap</span>(), <span class="number">10</span>);</pre></div>
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</div><h4 id='method.try_read' class="method"><code id='try_read.v'>pub fn <a href='#method.try_read' class='fnname'>try_read</a>(<br> &self<br>) -> <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="../../crossbeam/sync/struct.ShardedLockReadGuard.html" title="struct crossbeam::sync::ShardedLockReadGuard">ShardedLockReadGuard</a><T>, <a class="enum" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/enum.TryLockError.html" title="enum std::sys_common::poison::TryLockError">TryLockError</a><<a class="struct" href="../../crossbeam/sync/struct.ShardedLockReadGuard.html" title="struct crossbeam::sync::ShardedLockReadGuard">ShardedLockReadGuard</a><T>>></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#216-238' title='goto source code'>[src]</a></h4><div class='docblock'><p>Attempts to acquire this lock with shared read access.</p>
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<p>If the access could not be granted at this time, an error is returned. Otherwise, a guard
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is returned which will release the shared access when it is dropped. This method does not
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provide any guarantees with respect to the ordering of whether contentious readers or
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writers will acquire the lock first.</p>
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<p>This method will return an error if the lock is poisoned. A lock gets poisoned when a write
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operation panics.</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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">ShardedLock</span>::<span class="ident">new</span>(<span class="number">1</span>);
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<span class="kw">match</span> <span class="ident">lock</span>.<span class="ident">try_read</span>() {
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<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=</span><span class="op">></span> <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="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
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};</pre></div>
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</div><h4 id='method.read' class="method"><code id='read.v'>pub fn <a href='#method.read' class='fnname'>read</a>(<br> &self<br>) -> <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="../../crossbeam/sync/struct.ShardedLockReadGuard.html" title="struct crossbeam::sync::ShardedLockReadGuard">ShardedLockReadGuard</a><T>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/struct.PoisonError.html" title="struct std::sys_common::poison::PoisonError">PoisonError</a><<a class="struct" href="../../crossbeam/sync/struct.ShardedLockReadGuard.html" title="struct crossbeam::sync::ShardedLockReadGuard">ShardedLockReadGuard</a><T>>></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#267-285' title='goto source code'>[src]</a></h4><div class='docblock'><p>Locks with shared read access, blocking the current thread until it can be acquired.</p>
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<p>The calling thread will be blocked until there are no more writers which hold the lock.
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There may be other readers currently inside the lock when this method returns. This method
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does not provide any guarantees with respect to the ordering of whether contentious readers
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or writers will acquire the lock first.</p>
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<p>Returns a guard which will release the shared access when dropped.</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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
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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">std</span>::<span class="ident">thread</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">ShardedLock</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="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">n</span>, <span class="number">1</span>);
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<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">|</span><span class="op">|</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>();
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">is_ok</span>());
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}).<span class="ident">join</span>().<span class="ident">unwrap</span>();</pre></div>
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</div><h4 id='method.try_write' class="method"><code id='try_write.v'>pub fn <a href='#method.try_write' class='fnname'>try_write</a>(<br> &self<br>) -> <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="../../crossbeam/sync/struct.ShardedLockWriteGuard.html" title="struct crossbeam::sync::ShardedLockWriteGuard">ShardedLockWriteGuard</a><T>, <a class="enum" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/enum.TryLockError.html" title="enum std::sys_common::poison::TryLockError">TryLockError</a><<a class="struct" href="../../crossbeam/sync/struct.ShardedLockWriteGuard.html" title="struct crossbeam::sync::ShardedLockWriteGuard">ShardedLockWriteGuard</a><T>>></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#309-357' title='goto source code'>[src]</a></h4><div class='docblock'><p>Attempts to acquire this lock with exclusive write access.</p>
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<p>If the access could not be granted at this time, an error is returned. Otherwise, a guard
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is returned which will release the exclusive access when it is dropped. This method does
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not provide any guarantees with respect to the ordering of whether contentious readers or
|
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writers will acquire the lock first.</p>
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<p>This method will return an error if the lock is poisoned. A lock gets poisoned when a write
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operation panics.</p>
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<h1 id="examples-7" class="section-header"><a href="#examples-7">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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">ShardedLock</span>::<span class="ident">new</span>(<span class="number">1</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="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">n</span>, <span class="number">1</span>);
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">lock</span>.<span class="ident">try_write</span>().<span class="ident">is_err</span>());</pre></div>
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</div><h4 id='method.write' class="method"><code id='write.v'>pub fn <a href='#method.write' class='fnname'>write</a>(<br> &self<br>) -> <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="../../crossbeam/sync/struct.ShardedLockWriteGuard.html" title="struct crossbeam::sync::ShardedLockWriteGuard">ShardedLockWriteGuard</a><T>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/struct.PoisonError.html" title="struct std::sys_common::poison::PoisonError">PoisonError</a><<a class="struct" href="../../crossbeam/sync/struct.ShardedLockWriteGuard.html" title="struct crossbeam::sync::ShardedLockWriteGuard">ShardedLockWriteGuard</a><T>>></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#380-413' title='goto source code'>[src]</a></h4><div class='docblock'><p>Locks with exclusive write access, blocking the current thread until it can be acquired.</p>
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<p>The calling thread will be blocked until there are no more writers which hold the lock.
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There may be other readers currently inside the lock when this method returns. This method
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does not provide any guarantees with respect to the ordering of whether contentious readers
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or writers will acquire the lock first.</p>
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<p>Returns a guard which will release the exclusive access when dropped.</p>
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<h1 id="examples-8" class="section-header"><a href="#examples-8">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">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
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<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">ShardedLock</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="ident">unwrap</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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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">lock</span>.<span class="ident">try_read</span>().<span class="ident">is_err</span>());</pre></div>
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</div></div><h2 id='implementations' class='small-section-header'>Trait Implementations<a href='#implementations' class='anchor'></a></h2><div id='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> for <a class="struct" href="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</a><T> <span class="where fmt-newline">where<br> 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>, </span></code><a href='#impl-Debug' class='anchor'></a><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#416-434' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt' class="method hidden"><code id='fmt.v'>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="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#417-433' 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>
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</div></div><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="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</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 href='#impl-RefUnwindSafe' class='anchor'></a><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#87' title='goto source code'>[src]</a></h3><div class='impl-items'></div><h3 id='impl-Default' class='impl'><code class='in-band'>impl<T> <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="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</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/crossbeam_utils/sync/sharded_lock.rs.html#436-440' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.default' class="method hidden"><code id='default.v'>fn <a href='https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> <a class="struct" href="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</a><T></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#437-439' 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>
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</div></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.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</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> + ?<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-Sync' class='anchor'></a><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#84' title='goto source code'>[src]</a></h3><div class='impl-items'></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="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</a><T></code><a href='#impl-From%3CT%3E' class='anchor'></a><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#442-446' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from' class="method hidden"><code id='from.v'>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(t: T) -> <a class="struct" href="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</a><T></code><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#443-445' 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-UnwindSafe' class='impl'><code class='in-band'>impl<T> <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="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</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 href='#impl-UnwindSafe' class='anchor'></a><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#86' title='goto source code'>[src]</a></h3><div class='impl-items'></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.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</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.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-Send' class='anchor'></a><a class='srclink' href='../../src/crossbeam_utils/sync/sharded_lock.rs.html#83' 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-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="../../crossbeam/sync/struct.ShardedLock.html" title="struct crossbeam::sync::ShardedLock">ShardedLock</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></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-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.rs.html#544-549' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.into' class="method hidden"><code id='into.v'>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.rs.html#546-548' 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-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.rs.html#553-555' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from-1' class="method hidden"><code id='from.v-1'>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.rs.html#554' 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.rs.html#572-578' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error' class="type"><code id='Error.t'>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 id='try_from.v'>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.rs.html#575-577' 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.rs.html#560-567' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error-1' class="type"><code id='Error.t-1'>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 id='try_into.v'>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.rs.html#564-566' 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-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#218-220' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow_mut' class="method hidden"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>W</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>W</h3><code class="content"><span class="where fmt-newline">impl<'_, W> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>W <span class="where fmt-newline">where<br> W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</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">impl<'_, R> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>R <span class="where fmt-newline">where<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</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">impl<'_, I> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</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/iter/traits/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>;</span><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://d
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</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#213-215' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow' class="method hidden"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>W</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>W</h3><code class="content"><span class="where fmt-newline">impl<'_, W> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>W <span class="where fmt-newline">where<br> W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</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">impl<'_, R> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>R <span class="where fmt-newline">where<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</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">impl<'_, I> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'_ mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</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/iter/traits/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>;</span><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/ni
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</div></div><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#100-102' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.type_id' class="method hidden"><code id='type_id.v'>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#101' 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>
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