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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_utils`."><meta name="keywords" content="rust, rustlang, rust-lang, ShardedLock"><title>crossbeam_utils::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">&#9776;</div><a href='../../crossbeam_utils/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&lt;T&gt;</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&lt;T&gt;</a><a href="#impl-BorrowMut%3CT%3E">BorrowMut&lt;T&gt;</a><a href="#impl-From%3CT%3E">From&lt;T&gt;</a><a href="#impl-Into%3CU%3E">Into&lt;U&gt;</a><a href="#impl-TryFrom%3CU%3E">TryFrom&lt;U&gt;</a><a href="#impl-TryInto%3CU%3E">TryInto&lt;U&gt;</a></div></div><p class='location'><a href='../index.html'>crossbeam_utils</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'>&#x2212;</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_utils</a>::<wbr><a href='index.html'>sync</a>::<wbr><a class="struct" href=''>ShardedLock</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust struct'>pub struct ShardedLock&lt;T:&nbsp;?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt; { /* fields omitted */ }</pre></div><div class='docblock'><p>A sharded reader-writer lock.</p>
<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
are slower.</p>
<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
single cache line. Read operations will pick one of the shards depending on the current thread
and lock it. Write operations need to lock all shards in succession.</p>
<p>By splitting the lock into shards, concurrent read operations will in most cases choose
different shards and thus update different cache lines, which is good for scalability. However,
write operations need to do more work and are therefore slower than usual.</p>
<p>The priority policy of the lock is dependent on the underlying operating system's
implementation, and this type does not guarantee that any particular policy will be used.</p>
<h1 id="poisoning" class="section-header"><a href="#poisoning">Poisoning</a></h1>
<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
poisoned if a panic occurs while a write operation is in progress. If a panic occurs in any
read operation, the lock will not be poisoned.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<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>);
<span class="comment">// Any number of read locks can be held at once.</span>
{
<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>();
<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>();
<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>);
<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>);
} <span class="comment">// Read locks are dropped at this point.</span>
<span class="comment">// However, only one write lock may be held.</span>
{
<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>();
<span class="kw-2">*</span><span class="ident">w</span> <span class="op">+</span><span class="op">=</span> <span class="number">1</span>;
<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>);
} <span class="comment">// Write lock is dropped here.</span></pre></div>
</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&lt;T&gt; <a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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) -&gt; <a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<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>
</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) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/type.LockResult.html" title="type std::sys_common::poison::LockResult">LockResult</a>&lt;T&gt;</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>
<p>This method will return an error if the lock is poisoned. A lock gets poisoned when a write
operation panics.</p>
<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<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>());
{
<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>();
<span class="kw-2">*</span><span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;modified&quot;</span>.<span class="ident">to_owned</span>();
}
<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">&quot;modified&quot;</span>);</pre></div>
</div></div><h3 id='impl-1' class='impl'><code class='in-band'>impl&lt;T:&nbsp;?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt; <a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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>(&amp;self) -&gt; <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>
<p>If another thread can still access the lock, it may become poisoned at any time. A <code>false</code>
result should not be trusted without additional synchronization.</p>
<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
<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>));
<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>();
<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> {
<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>();
<span class="macro">panic</span><span class="macro">!</span>(); <span class="comment">// the lock gets poisoned</span>
}).<span class="ident">join</span>();
<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>
</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>(&amp;mut self) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/type.LockResult.html" title="type std::sys_common::poison::LockResult">LockResult</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>T&gt;</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>
<p>Since this call borrows the lock mutably, no actual locking needs to take place.</p>
<p>This method will return an error if the lock is poisoned. A lock gets poisoned when a write
operation panics.</p>
<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<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>);
<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>;
<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>
</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>(&amp;self) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/type.TryLockResult.html" title="type std::sys_common::poison::TryLockResult">TryLockResult</a>&lt;<a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLockReadGuard.html" title="struct crossbeam_utils::sync::ShardedLockReadGuard">ShardedLockReadGuard</a>&lt;T&gt;&gt;</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>
<p>If the access could not be granted at this time, an error is returned. Otherwise, a guard
is returned which will release the shared access when it is dropped. This method does not
provide any guarantees with respect to the ordering of whether contentious readers or
writers will acquire the lock first.</p>
<p>This method will return an error if the lock is poisoned. A lock gets poisoned when a write
operation panics.</p>
<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<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>);
<span class="kw">match</span> <span class="ident">lock</span>.<span class="ident">try_read</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=</span><span class="op">&gt;</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>),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
};</pre></div>
</div><h4 id='method.read' class="method"><code id='read.v'>pub fn <a href='#method.read' class='fnname'>read</a>(&amp;self) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/type.LockResult.html" title="type std::sys_common::poison::LockResult">LockResult</a>&lt;<a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLockReadGuard.html" title="struct crossbeam_utils::sync::ShardedLockReadGuard">ShardedLockReadGuard</a>&lt;T&gt;&gt;</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>
<p>The calling thread will be blocked until there are no more writers which hold the lock.
There may be other readers currently inside the lock when this method returns. This method
does not provide any guarantees with respect to the ordering of whether contentious readers
or writers will acquire the lock first.</p>
<p>Returns a guard which will release the shared access when dropped.</p>
<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
<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>));
<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>();
<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>();
<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>);
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">|</span><span class="op">|</span> {
<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="macro">assert</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">is_ok</span>());
}).<span class="ident">join</span>().<span class="ident">unwrap</span>();</pre></div>
</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>(&amp;self) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/type.TryLockResult.html" title="type std::sys_common::poison::TryLockResult">TryLockResult</a>&lt;<a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLockWriteGuard.html" title="struct crossbeam_utils::sync::ShardedLockWriteGuard">ShardedLockWriteGuard</a>&lt;T&gt;&gt;</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>
<p>If the access could not be granted at this time, an error is returned. Otherwise, a guard
is returned which will release the exclusive access when it is dropped. This method does
not provide any guarantees with respect to the ordering of whether contentious readers or
writers will acquire the lock first.</p>
<p>This method will return an error if the lock is poisoned. A lock gets poisoned when a write
operation panics.</p>
<h1 id="examples-7" class="section-header"><a href="#examples-7">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<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>);
<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>();
<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>);
<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>
</div><h4 id='method.write' class="method"><code id='write.v'>pub fn <a href='#method.write' class='fnname'>write</a>(&amp;self) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/sys_common/poison/type.LockResult.html" title="type std::sys_common::poison::LockResult">LockResult</a>&lt;<a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLockWriteGuard.html" title="struct crossbeam_utils::sync::ShardedLockWriteGuard">ShardedLockWriteGuard</a>&lt;T&gt;&gt;</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>
<p>The calling thread will be blocked until there are no more writers which hold the lock.
There may be other readers currently inside the lock when this method returns. This method
does not provide any guarantees with respect to the ordering of whether contentious readers
or writers will acquire the lock first.</p>
<p>Returns a guard which will release the exclusive access when dropped.</p>
<h1 id="examples-8" class="section-header"><a href="#examples-8">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">crossbeam_utils</span>::<span class="ident">sync</span>::<span class="ident">ShardedLock</span>;
<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>);
<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>();
<span class="kw-2">*</span><span class="ident">n</span> <span class="op">=</span> <span class="number">2</span>;
<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>
</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-Send' class='impl'><code class='in-band'>impl&lt;T:&nbsp;?<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>&gt; <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_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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><h3 id='impl-Default' class='impl'><code class='in-band'>impl&lt;T:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a>&gt; <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_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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>() -&gt; <a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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 &quot;default value&quot; 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-Sync' class='impl'><code class='in-band'>impl&lt;T:&nbsp;?<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> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>&gt; <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_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for <a class="struct" href="../../crossbeam_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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) -&gt; Self</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>
</div></div><h3 id='impl-Debug' class='impl'><code class='in-band'>impl&lt;T:&nbsp;?<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>&gt; <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_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <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/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>
</div></div><h3 id='impl-UnwindSafe' class='impl'><code class='in-band'>impl&lt;T:&nbsp;?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt; <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_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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-RefUnwindSafe' class='impl'><code class='in-band'>impl&lt;T:&nbsp;?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt; <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_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt;</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></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&lt;T:&nbsp;?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt; <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_utils/sync/struct.ShardedLock.html" title="struct crossbeam_utils::sync::ShardedLock">ShardedLock</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,&nbsp;</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&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,&nbsp;</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) -&gt; 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>
</div></div><h3 id='impl-From%3CT%3E-1' class='impl'><code class='in-band'>impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; 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) -&gt; 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>
</div></div><h3 id='impl-TryFrom%3CU%3E' class='impl'><code class='in-band'>impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,&nbsp;</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>
</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) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<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>&gt;</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>
</div></div><h3 id='impl-TryInto%3CU%3E' class='impl'><code class='in-band'>impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,&nbsp;</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> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<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>
</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) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<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>&gt;</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>
</div></div><h3 id='impl-BorrowMut%3CT%3E' class='impl'><code class='in-band'>impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</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">&amp;'_ 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">&amp;'_ mut </a>W</h3><code class="content"><span class="where fmt-newline">impl&lt;'_, W&gt; <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">&amp;'_ mut </a>W <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;'_, R&gt; <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">&amp;'_ mut </a>R <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;'_, I&gt; <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">&amp;'_ mut </a>I <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>,&nbsp;</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> = &lt;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>&gt;::<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&lt;'_, F&gt; <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">&amp;'_ mut </a>F <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>,&nbsp;</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> = &lt;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>&gt;::<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></div></div><code id='borrow_mut.v'>fn <a href='https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut' class='fnname'>borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>T</code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#219' 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>
</div></div><h3 id='impl-Borrow%3CT%3E' class='impl'><code class='in-band'>impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</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">&amp;'_ 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">&amp;'_ mut </a>W</h3><code class="content"><span class="where fmt-newline">impl&lt;'_, W&gt; <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">&amp;'_ mut </a>W <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;'_, R&gt; <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">&amp;'_ mut </a>R <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>,&nbsp;</span></span><span class="where fmt-newline">impl&lt;'_, I&gt; <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">&amp;'_ mut </a>I <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>,&nbsp;</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> = &lt;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>&gt;::<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&lt;'_, F&gt; <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">&amp;'_ mut </a>F <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>,&nbsp;</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> = &lt;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>&gt;::<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></div></div><code id='borrow.v'>fn <a href='https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow' class='fnname'>borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>T</code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214' 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>
</div></div><h3 id='impl-Any' class='impl'><code class='in-band'>impl&lt;T&gt; <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>&nbsp;&nbsp;&nbsp;&nbsp;T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</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>(&amp;self) -&gt; <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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