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<div class="sidebar-menu">☰</div>
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<p class='location'>Struct Sender</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.spawn">spawn</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Executor">Executor</a><a href="#impl-Executor%3CT%3E">Executor<T></a><a href="#impl-Clone">Clone</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='index.html'>tokio_threadpool</a></p><script>window.sidebarCurrent = {name: 'Sender', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>tokio_threadpool</a>::<wbr><a class="struct" href=''>Sender</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#29-31' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Sender { /* fields omitted */ }</pre></div><div class='docblock'><p>Submit futures to the associated thread pool for execution.</p>
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<p>A <code>Sender</code> instance is a handle to a single thread pool, allowing the owner
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of the handle to spawn futures onto the thread pool. New futures are spawned
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using <a href="#method.spawn"><code>Sender::spawn</code></a>.</p>
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<p>The <code>Sender</code> handle is <em>only</em> used for spawning new futures. It does not
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impact the lifecycle of the thread pool in any way.</p>
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<p><code>Sender</code> instances are obtained by calling <a href="struct.ThreadPool.html#method.sender"><code>ThreadPool::sender</code></a>. The
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<code>Sender</code> struct implements the <code>Executor</code> trait.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../tokio_threadpool/struct.Sender.html" title="struct tokio_threadpool::Sender">Sender</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#33-124' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.spawn' class="method"><span id='spawn.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.spawn' class='fnname'>spawn</a><F>(&self, future: F) -> <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="../tokio_executor/struct.SpawnError.html" title="struct tokio_executor::SpawnError">SpawnError</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Error = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#83-88' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Spawn a future onto the thread pool</p>
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<p>This function takes ownership of the future and spawns it onto the
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thread pool, assigning it to a worker thread. The exact strategy used to
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assign a future to a worker depends on if the caller is already on a
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worker thread or external to the thread pool.</p>
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<p>If the caller is currently on the thread pool, the spawned future will
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be assigned to the same worker that the caller is on. If the caller is
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external to the thread pool, the future will be assigned to a random
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worker.</p>
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<p>If <code>spawn</code> returns <code>Ok</code>, this does not mean that the future will be
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executed. The thread pool can be forcibly shutdown between the time
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<code>spawn</code> is called and the future has a chance to execute.</p>
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<p>If <code>spawn</code> returns <code>Err</code>, then the future failed to be spawned. There
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are two possible causes:</p>
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<ul>
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<li>The thread pool is at capacity and is unable to spawn a new future.
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This is a temporary failure. At some point in the future, the thread
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pool might be able to spawn new futures.</li>
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<li>The thread pool is shutdown. This is a permanent failure indicating
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that the handle will never be able to spawn new futures.</li>
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</ul>
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<p>The status of the thread pool can be queried before calling <code>spawn</code>
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using the <code>status</code> function (part of the <code>Executor</code> trait).</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">futures</span>::<span class="ident">future</span>::{<span class="ident">Future</span>, <span class="ident">lazy</span>};
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<span class="comment">// Create a thread pool with default configuration values</span>
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<span class="kw">let</span> <span class="ident">thread_pool</span> <span class="op">=</span> <span class="ident">ThreadPool</span>::<span class="ident">new</span>();
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<span class="ident">thread_pool</span>.<span class="ident">sender</span>().<span class="ident">spawn</span>(<span class="ident">lazy</span>(<span class="op">||</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"called from a worker thread"</span>);
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<span class="prelude-val">Ok</span>(())
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})).<span class="ident">unwrap</span>();
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<span class="comment">// Gracefully shutdown the threadpool</span>
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<span class="ident">thread_pool</span>.<span class="ident">shutdown</span>().<span class="ident">wait</span>().<span class="ident">unwrap</span>();</pre>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<div id='implementations-list'>
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<h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../tokio_threadpool/struct.Sender.html" title="struct tokio_threadpool::Sender">Sender</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#28' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#28' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><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-Executor' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="../tokio_executor/trait.Executor.html" title="trait tokio_executor::Executor">Executor</a> for <a class="struct" href="../tokio_threadpool/struct.Sender.html" title="struct tokio_threadpool::Sender">Sender</a></code><a href='#impl-Executor' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#126-143' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.status' class="method"><span id='status.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../tokio_executor/trait.Executor.html#method.status' class='fnname'>status</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../tokio_executor/struct.SpawnError.html" title="struct tokio_executor::SpawnError">SpawnError</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#127-130' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Provides a best effort hint to whether or not <code>spawn</code> will succeed. <a href="../tokio_executor/trait.Executor.html#method.status">Read more</a></p>
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</div><h4 id='method.spawn-1' class="method"><span id='spawn.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../tokio_executor/trait.Executor.html#tymethod.spawn' class='fnname'>spawn</a>(<br> &mut self, <br> future: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><<a class="trait" href="../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Error = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>><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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../tokio_executor/struct.SpawnError.html" title="struct tokio_executor::SpawnError">SpawnError</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#132-137' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Spawns a future object to run on this executor. <a href="../tokio_executor/trait.Executor.html#tymethod.spawn">Read more</a></p>
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</div></div><h3 id='impl-Executor-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'a> <a class="trait" href="../tokio_executor/trait.Executor.html" title="trait tokio_executor::Executor">Executor</a> for &'a <a class="struct" href="../tokio_threadpool/struct.Sender.html" title="struct tokio_threadpool::Sender">Sender</a></code><a href='#impl-Executor-1' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#145-182' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.status-1' class="method"><span id='status.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../tokio_executor/trait.Executor.html#method.status' class='fnname'>status</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../tokio_executor/struct.SpawnError.html" title="struct tokio_executor::SpawnError">SpawnError</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#146-160' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Provides a best effort hint to whether or not <code>spawn</code> will succeed. <a href="../tokio_executor/trait.Executor.html#method.status">Read more</a></p>
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</div><h4 id='method.spawn-2' class="method"><span id='spawn.v-2' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../tokio_executor/trait.Executor.html#tymethod.spawn' class='fnname'>spawn</a>(<br> &mut self, <br> future: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><<a class="trait" href="../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Error = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>><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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../tokio_executor/struct.SpawnError.html" title="struct tokio_executor::SpawnError">SpawnError</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#162-176' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Spawns a future object to run on this executor. <a href="../tokio_executor/trait.Executor.html#tymethod.spawn">Read more</a></p>
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</div></div><h3 id='impl-Executor%3CT%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="../futures/future/trait.Executor.html" title="trait futures::future::Executor">Executor</a><T> for <a class="struct" href="../tokio_threadpool/struct.Sender.html" title="struct tokio_threadpool::Sender">Sender</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Error = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static, </span></code><a href='#impl-Executor%3CT%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#184-201' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.execute' class="method"><span id='execute.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../futures/future/trait.Executor.html#tymethod.execute' class='fnname'>execute</a>(&self, future: T) -> <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="../futures/future/struct.ExecuteError.html" title="struct futures::future::ExecuteError">ExecuteError</a><T>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#187-200' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Spawns a future to run on this <code>Executor</code>, typically in the "background". <a href="../futures/future/trait.Executor.html#tymethod.execute">Read more</a></p>
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</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../tokio_threadpool/struct.Sender.html" title="struct tokio_threadpool::Sender">Sender</a></code><a href='#impl-Clone' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#244-250' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../tokio_threadpool/struct.Sender.html" title="struct tokio_threadpool::Sender">Sender</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_threadpool/sender.rs.html#246-249' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
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</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#117-119' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
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