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oxipng/doc/bitflags/__core/cell/struct.RefMut.html
Joshua Holmer ea484a8978 Version 0.4.0
2016-04-08 13:52:15 -04:00

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<h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>cell</a>::<wbr><a class='struct' href=''>RefMut</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a id='src-28336' class='srclink' href='https://doc.rust-lang.org/nightly/core/cell/struct.RefMut.html?gotosrc=28336' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct RefMut&lt;'b, T&gt; <span class='where'>where T: 'b + ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span> {
// some fields omitted
}</pre><span class="since">1.0.0</span><div class='docblock'><p>A wrapper type for a mutably borrowed value from a <code>RefCell&lt;T&gt;</code>.</p>
<p>See the <a href="index.html">module-level documentation</a> for more.</p>
</div><h2 id='methods'>Methods</h2><h3 class='impl'><code>impl&lt;'b, T&gt; <a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, T&gt; <span class='where'>where T: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='impl-items'><h4 id='method.map' class='method'><span class="since">1.8.0</span><code>fn <a href='#method.map' class='fnname'>map</a>&lt;U, F&gt;(orig: <a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, T&gt;, f: F) -&gt; <a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, U&gt; <span class='where'>where F: <a class='trait' href='../../../bitflags/__core/ops/trait.FnOnce.html' title='bitflags::__core::ops::FnOnce'>FnOnce</a>(&amp;mut T) -&gt; &amp;mut U, U: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h4>
<div class='docblock'><p>Make a new <code>RefMut</code> for a component of the borrowed data, e.g. an enum
variant.</p>
<p>The <code>RefCell</code> is already mutably borrowed, so this cannot fail.</p>
<p>This is an associated function that needs to be used as
<code>RefMut::map(...)</code>. A method would interfere with methods of the same
name on the contents of a <code>RefCell</code> used through <code>Deref</code>.</p>
<h1 id='example' class='section-header'><a href='#example'>Example</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cell</span>::{<span class='ident'>RefCell</span>, <span class='ident'>RefMut</span>};
<span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>RefCell</span>::<span class='ident'>new</span>((<span class='number'>5</span>, <span class='string'>&#39;b&#39;</span>));
{
<span class='kw'>let</span> <span class='ident'>b1</span>: <span class='ident'>RefMut</span><span class='op'>&lt;</span>(<span class='ident'>u32</span>, <span class='ident'>char</span>)<span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>c</span>.<span class='ident'>borrow_mut</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>b2</span>: <span class='ident'>RefMut</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>RefMut</span>::<span class='ident'>map</span>(<span class='ident'>b1</span>, <span class='op'>|</span><span class='ident'>t</span><span class='op'>|</span> <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>t</span>.<span class='number'>0</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>b2</span>, <span class='number'>5</span>);
<span class='op'>*</span><span class='ident'>b2</span> <span class='op'>=</span> <span class='number'>42</span>;
}
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>c</span>.<span class='ident'>borrow</span>(), (<span class='number'>42</span>, <span class='string'>&#39;b&#39;</span>));</pre>
</div><h4 id='method.filter_map' class='method'><code>fn <a href='#method.filter_map' class='fnname'>filter_map</a>&lt;U, F&gt;(orig: <a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, T&gt;, f: F) -&gt; <a class='enum' href='../../../bitflags/__core/option/enum.Option.html' title='bitflags::__core::option::Option'>Option</a>&lt;<a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, U&gt;&gt; <span class='where'>where U: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a>, F: <a class='trait' href='../../../bitflags/__core/ops/trait.FnOnce.html' title='bitflags::__core::ops::FnOnce'>FnOnce</a>(&amp;mut T) -&gt; <a class='enum' href='../../../bitflags/__core/option/enum.Option.html' title='bitflags::__core::option::Option'>Option</a>&lt;&amp;mut U&gt;</span></code></h4>
<div class='stability'><em class='stab unstable deprecated'>Deprecated since 1.8.0<p>: can be built on <code>RefMut::map</code>: <a href="https://crates.io/crates/ref_filter_map">https://crates.io/crates/ref_filter_map</a></p>
</em></div><div class='docblock'><p>Make a new <code>RefMut</code> for an optional component of the borrowed data, e.g.
an enum variant.</p>
<p>The <code>RefCell</code> is already mutably borrowed, so this cannot fail.</p>
<p>This is an associated function that needs to be used as
<code>RefMut::filter_map(...)</code>. A method would interfere with methods of the
same name on the contents of a <code>RefCell</code> used through <code>Deref</code>.</p>
<h1 id='example-1' class='section-header'><a href='#example-1'>Example</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cell</span>::{<span class='ident'>RefCell</span>, <span class='ident'>RefMut</span>};
<span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>RefCell</span>::<span class='ident'>new</span>(<span class='prelude-val'>Ok</span>(<span class='number'>5</span>));
{
<span class='kw'>let</span> <span class='ident'>b1</span>: <span class='ident'>RefMut</span><span class='op'>&lt;</span><span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, ()<span class='op'>&gt;&gt;</span> <span class='op'>=</span> <span class='ident'>c</span>.<span class='ident'>borrow_mut</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>b2</span>: <span class='ident'>RefMut</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>RefMut</span>::<span class='ident'>filter_map</span>(<span class='ident'>b1</span>, <span class='op'>|</span><span class='ident'>o</span><span class='op'>|</span> {
<span class='ident'>o</span>.<span class='ident'>as_mut</span>().<span class='ident'>ok</span>()
}).<span class='ident'>unwrap</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>b2</span>, <span class='number'>5</span>);
<span class='op'>*</span><span class='ident'>b2</span> <span class='op'>=</span> <span class='number'>42</span>;
}
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='op'>*</span><span class='ident'>c</span>.<span class='ident'>borrow</span>(), <span class='prelude-val'>Ok</span>(<span class='number'>42</span>));</pre>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><code>impl&lt;'b, T, U&gt; <a class='trait' href='../../../bitflags/__core/ops/trait.CoerceUnsized.html' title='bitflags::__core::ops::CoerceUnsized'>CoerceUnsized</a>&lt;<a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, U&gt;&gt; for <a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, T&gt; <span class='where'>where U: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a>, T: <a class='trait' href='../../../bitflags/__core/marker/trait.Unsize.html' title='bitflags::__core::marker::Unsize'>Unsize</a>&lt;U&gt; + ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='impl-items'></div><h3 class='impl'><code>impl&lt;'b, T&gt; <a class='trait' href='../../../bitflags/__core/ops/trait.DerefMut.html' title='bitflags::__core::ops::DerefMut'>DerefMut</a> for <a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, T&gt; <span class='where'>where T: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='impl-items'><h4 id='method.deref_mut' class='method'><code>fn <a href='../../../bitflags/__core/ops/trait.DerefMut.html#tymethod.deref_mut' class='fnname'>deref_mut</a>(&amp;mut self) -&gt; &amp;mut T</code></h4>
</div><h3 class='impl'><code>impl&lt;'b, T&gt; <a class='trait' href='../../../bitflags/__core/ops/trait.Deref.html' title='bitflags::__core::ops::Deref'>Deref</a> for <a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, T&gt; <span class='where'>where T: ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='impl-items'><h4 id='associatedtype.Target' class='type'><code>type <a href='../../../bitflags/__core/ops/trait.Deref.html#associatedtype.Target' class='type'>Target</a> = T</code></h4>
<h4 id='method.deref' class='method'><code>fn <a href='../../../bitflags/__core/ops/trait.Deref.html#tymethod.deref' class='fnname'>deref</a>(&amp;self) -&gt; &amp;T</code></h4>
</div><h3 class='impl'><code>impl&lt;'b, T&gt; <a class='trait' href='../../../bitflags/__core/fmt/trait.Debug.html' title='bitflags::__core::fmt::Debug'>Debug</a> for <a class='struct' href='../../../bitflags/__core/cell/struct.RefMut.html' title='bitflags::__core::cell::RefMut'>RefMut</a>&lt;'b, T&gt; <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/fmt/trait.Debug.html' title='bitflags::__core::fmt::Debug'>Debug</a> + ?<a class='trait' href='../../../bitflags/__core/marker/trait.Sized.html' title='bitflags::__core::marker::Sized'>Sized</a></span></code></h3><div class='impl-items'><h4 id='method.fmt' class='method'><code>fn <a href='../../../bitflags/__core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class='struct' href='../../../bitflags/__core/fmt/struct.Formatter.html' title='bitflags::__core::fmt::Formatter'>Formatter</a>) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/fmt/struct.Error.html' title='bitflags::__core::fmt::Error'>Error</a>&gt;</code></h4>
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