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<p class='location'>Trait AsMut</p><div class="block items"><ul><li><a href="#required-methods">Required Methods</a></li><li><a href="#implementors">Implementors</a></li></ul></div><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>convert</a></p><script>window.sidebarCurrent = {name: 'AsMut', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>core</a>::<wbr><a href='index.html'>convert</a>::<wbr><a class="trait" href=''>AsMut</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/core/convert.rs.html#149-153' title='goto source code'>[src]</a></span></h1>
<pre class='rust trait'>pub trait AsMut<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> {
fn <a href='#tymethod.as_mut' class='fnname'>as_mut</a>(&mut self) -> &mut T;
}</pre><div class='docblock'><p>A cheap, mutable reference-to-mutable reference conversion.</p>
<p>This trait is similar to <code>AsRef</code> but used for converting between mutable
references.</p>
<p><strong>Note: this trait must not fail</strong>. If the conversion can fail, use a
dedicated method which returns an <a href="../../std/option/enum.Option.html"><code>Option<T></code></a> or a <a href="../../std/result/enum.Result.html"><code>Result<T, E></code></a>.</p>
<h1 id='generic-implementations' class='section-header'><a href='#generic-implementations'>Generic Implementations</a></h1>
<ul>
<li><code>AsMut</code> auto-dereferences if the inner type is a reference or a mutable
reference (e.g.: <code>foo.as_ref()</code> will work the same if <code>foo</code> has type
<code>&mut Foo</code> or <code>&&mut Foo</code>)</li>
</ul>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<p><a href="../../std/boxed/struct.Box.html"><code>Box<T></code></a> implements <code>AsMut<T></code>:</p>
<pre class="rust rust-example-rendered">
<span class="kw">fn</span> <span class="ident">add_one</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">AsMut</span><span class="op"><</span><span class="ident">u64</span><span class="op">>></span>(<span class="ident">num</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) {
<span class="kw-2">*</span><span class="ident">num</span>.<span class="ident">as_mut</span>() <span class="op">+=</span> <span class="number">1</span>;
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">boxed_num</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">new</span>(<span class="number">0</span>);
<span class="ident">add_one</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">boxed_num</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">boxed_num</span>, <span class="number">1</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=fn%20main()%20%7B%0Afn%20add_one%3CT%3A%20AsMut%3Cu64%3E%3E(num%3A%20%26mut%20T)%20%7B%0A%20%20%20%20*num.as_mut()%20%2B%3D%201%3B%0A%7D%0A%0Alet%20mut%20boxed_num%20%3D%20Box%3A%3Anew(0)%3B%0Aadd_one(%26mut%20boxed_num)%3B%0Aassert_eq!(*boxed_num%2C%201)%3B%0A%7D">Run</a></pre>
</div>
<h2 id='required-methods'>Required Methods</h2>
<div class='methods'>
<h3 id='tymethod.as_mut' class='method'><span id='as_mut.v' class='invisible'><code>fn <a href='#tymethod.as_mut' class='fnname'>as_mut</a>(&mut self) -> &mut T</code></span></h3><div class='docblock'><p>Performs the conversion.</p>
</div></div>
<h2 id='implementors'>Implementors</h2>
<ul class='item-list' id='implementors-list'>
<li><code>impl<'a, T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, U: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> AsMut<U> for &'a mut T <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/convert/trait.AsMut.html" title="trait core::convert::AsMut">AsMut</a><U>, </span></code></li>
<li><code>impl<T> AsMut<[T]> for [T]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 0]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 1]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 2]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 3]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 4]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 5]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 6]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 7]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 8]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 9]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 10]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 11]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 12]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 13]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 14]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 15]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 16]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 17]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 18]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 19]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 20]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 21]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 22]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 23]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 24]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 25]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 26]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 27]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 28]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 29]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 30]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 31]</code></li>
<li><code>impl<T> AsMut<[T]> for [T; 32]</code></li>
</ul><script type="text/javascript" async
src="../../implementors/core/convert/trait.AsMut.js">
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