135 lines
7.2 KiB
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135 lines
7.2 KiB
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<title>glib::object::Downcast - Rust</title>
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<p class='location'>Trait Downcast</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'>glib</a>::<wbr><a href='index.html'>object</a></p><script>window.sidebarCurrent = {name: 'Downcast', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>glib</a>::<wbr><a href='index.html'>object</a>::<wbr><a class="trait" href=''>Downcast</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/glib/object.rs.html#87-100' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Downcast<T> {
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fn <a href='#tymethod.can_downcast' class='fnname'>can_downcast</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>;
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fn <a href='#tymethod.downcast' class='fnname'>downcast</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self><br> <span class="where">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span>;
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unsafe fn <a href='#tymethod.downcast_unchecked' class='fnname'>downcast_unchecked</a>(self) -> T;
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}</pre><div class='docblock'><p>Downcasts support.</p>
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</div>
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<h2 id='required-methods'>Required Methods</h2>
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<div class='methods'>
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<h3 id='tymethod.can_downcast' class='method'><span id='can_downcast.v' class='invisible'><code>fn <a href='#tymethod.can_downcast' class='fnname'>can_downcast</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h3><div class='docblock'><p>Checks if it's possible to downcast to <code>T</code>.</p>
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<p>Returns <code>true</code> if the instance implements <code>T</code> and <code>false</code> otherwise.</p>
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</div><h3 id='tymethod.downcast' class='method'><span id='downcast.v' class='invisible'><code>fn <a href='#tymethod.downcast' class='fnname'>downcast</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code></span></h3><div class='docblock'><p>Tries to downcast to <code>T</code>.</p>
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<p>Returns <code>Ok(T)</code> if the instance implements <code>T</code> and <code>Err(Self)</code> otherwise.</p>
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</div><h3 id='tymethod.downcast_unchecked' class='method'><span id='downcast_unchecked.v' class='invisible'><code>unsafe fn <a href='#tymethod.downcast_unchecked' class='fnname'>downcast_unchecked</a>(self) -> T</code></span></h3><div class='docblock'><p>Downcasts to <code>T</code> unconditionally.</p>
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<p>Panics if compiled with <code>debug_assertions</code> and the instance doesn't implement <code>T</code>.</p>
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</div></div>
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<h2 id='implementors'>Implementors</h2>
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<ul class='item-list' id='implementors-list'>
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<li><code>impl<Super: <a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a><Super>, Sub: <a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a><Super>> Downcast<Sub> for Super</code></li>
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