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<pre class='rust struct'>pub struct Object(_, _);</pre><div class='docblock'><p>The base class in the object hierarchy.</p>
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<h3 id='impl-Clone' class='impl'><span class='in-band'><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="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a></code><a href='#impl-Clone' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#186' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; <a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#186' title='goto source code'>[src]</a></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 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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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, __arg_0: &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></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#186' title='goto source code'>[src]</a></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 class='impl-items'><h4 id='method.hash' class="method"><span id='hash.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash' class='fnname'>hash</a>&lt;__H:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>&gt;(&amp;self, __arg_0: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>__H)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#186' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Feeds this value into the given [<code>Hasher</code>]. <a href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash">Read more</a></p>
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<div class='docblock'><p>Feeds a slice of this type into the given [<code>Hasher</code>]. <a href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice">Read more</a></p>
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<div class='docblock'><p>Returns the type identifier of <code>Self</code>.</p>
</div></div><h3 id='impl-PartialEq%3CT%3E' class='impl'><span class='in-band'><code>impl&lt;T:&nbsp;<a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;<a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a>&gt;&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>&lt;T&gt; for <a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a></code><a href='#impl-PartialEq%3CT%3E' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#425-431' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>T) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#427-430' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>Rhs) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><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/cmp.rs.html#121' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 id='impl-Eq' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a></code><a href='#impl-Eq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#455' title='goto source code'>[src]</a></span></h3>
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<p class='location'>Struct WeakRef</p><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.upgrade">upgrade</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Drop">Drop</a><a href="#impl-Clone">Clone</a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='../index.html'>glib</a>::<wbr><a href='index.html'>object</a></p><script>window.sidebarCurrent = {name: 'WeakRef', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>glib</a>::<wbr><a href='index.html'>object</a>::<wbr><a class="struct" href=''>WeakRef</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust struct'>pub struct WeakRef&lt;T:&nbsp;<a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;<a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a>&gt; + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(_, _);</pre>
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<h3 id='impl' class='impl'><span class='in-band'><code>impl&lt;T:&nbsp;<a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;<a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a>&gt; + <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a> + <a class="trait" href="../../glib/wrapper/trait.UnsafeFrom.html" title="trait glib::wrapper::UnsafeFrom">UnsafeFrom</a>&lt;ObjectRef&gt; + <a class="trait" href="../../glib/wrapper/trait.Wrapper.html" title="trait glib::wrapper::Wrapper">Wrapper</a> + ?<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="../../glib/object/struct.WeakRef.html" title="struct glib::object::WeakRef">WeakRef</a>&lt;T&gt;</code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#777-789' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.upgrade' class="method"><span id='upgrade.v' class='invisible'><code>pub fn <a href='#method.upgrade' class='fnname'>upgrade</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;T&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#778-788' title='goto source code'>[src]</a></span></h4>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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<h3 id='impl-Drop' class='impl'><span class='in-band'><code>impl&lt;T:&nbsp;<a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;<a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a>&gt; + ?<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/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="../../glib/object/struct.WeakRef.html" title="struct glib::object::WeakRef">WeakRef</a>&lt;T&gt;</code><a href='#impl-Drop' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#791-797' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.drop' class="method"><span id='drop.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop' class='fnname'>drop</a>(&amp;mut self)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#792-796' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Executes the destructor for this type. <a href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></p>
</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><code>impl&lt;T:&nbsp;<a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;<a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a>&gt; + ?<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/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../glib/object/struct.WeakRef.html" title="struct glib::object::WeakRef">WeakRef</a>&lt;T&gt;</code><a href='#impl-Clone' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#799-813' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; Self</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#800-812' title='goto source code'>[src]</a></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>
</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&amp;mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>Self)</code></span><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#112-114' title='goto source code'>[src]</a></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>
</div></div><h3 id='impl-Send' class='impl'><span class='in-band'><code>impl&lt;T:&nbsp;<a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;<a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a>&gt; + <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> + ?<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.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../glib/object/struct.WeakRef.html" title="struct glib::object::WeakRef">WeakRef</a>&lt;T&gt;</code><a href='#impl-Send' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#815' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><code>impl&lt;T:&nbsp;<a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;<a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a>&gt; + <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> + ?<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.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../glib/object/struct.WeakRef.html" title="struct glib::object::WeakRef">WeakRef</a>&lt;T&gt;</code><a href='#impl-Sync' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/object.rs.html#816' title='goto source code'>[src]</a></span></h3>
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<p class='location'>Trait Cast</p><div class="block items"><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.upcast">upcast</a><a href="#method.downcast">downcast</a><a href="#method.is">is</a><a href="#method.dynamic_cast">dynamic_cast</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>glib</a>::<wbr><a href='index.html'>object</a></p><script>window.sidebarCurrent = {name: 'Cast', 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'>glib</a>::<wbr><a href='index.html'>object</a>::<wbr><a class="trait" href=''>Cast</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust trait'>pub trait Cast: <a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;<a class="struct" href="../../glib/object/struct.Object.html" title="struct glib::object::Object">Object</a>&gt; {
fn <a href='#method.upcast' class='fnname'>upcast</a>&lt;T&gt;(self) -&gt; T<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a> + <a class="trait" href="../../glib/wrapper/trait.UnsafeFrom.html" title="trait glib::wrapper::UnsafeFrom">UnsafeFrom</a>&lt;ObjectRef&gt; + <a class="trait" href="../../glib/wrapper/trait.Wrapper.html" title="trait glib::wrapper::Wrapper">Wrapper</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Self: <a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;T&gt;</span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.downcast' class='fnname'>downcast</a>&lt;T&gt;(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;T, Self&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Self: <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="../../glib/object/trait.Downcast.html" title="trait glib::object::Downcast">Downcast</a>&lt;T&gt;</span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.is' class='fnname'>is</a>&lt;T&gt;(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.dynamic_cast' class='fnname'>dynamic_cast</a>&lt;T&gt;(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;T, Self&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a> + <a class="trait" href="../../glib/wrapper/trait.UnsafeFrom.html" title="trait glib::wrapper::UnsafeFrom">UnsafeFrom</a>&lt;ObjectRef&gt; + <a class="trait" href="../../glib/wrapper/trait.Wrapper.html" title="trait glib::wrapper::Wrapper">Wrapper</a></span>,
{ ... }
}</pre><div class='docblock'><p>Upcasting and downcasting support.</p>
<p>Provides conversions up and down the class hierarchy tree.</p>
</div>
<h2 id='provided-methods' class='small-section-header'>
Provided Methods<a href='#provided-methods' class='anchor'></a>
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<h3 id='method.upcast' class='method'><span id='upcast.v' class='invisible'><code>fn <a href='#method.upcast' class='fnname'>upcast</a>&lt;T&gt;(self) -&gt; T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a> + <a class="trait" href="../../glib/wrapper/trait.UnsafeFrom.html" title="trait glib::wrapper::UnsafeFrom">UnsafeFrom</a>&lt;ObjectRef&gt; + <a class="trait" href="../../glib/wrapper/trait.Wrapper.html" title="trait glib::wrapper::Wrapper">Wrapper</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;Self: <a class="trait" href="../../glib/object/trait.IsA.html" title="trait glib::object::IsA">IsA</a>&lt;T&gt;,&nbsp;</span></code></span></h3><div class='docblock'><p>Upcasts an object to a superclass or interface <code>T</code>.</p>
<p><em>NOTE</em>: This statically checks at compile-time if casting is possible. It is not always
known at compile-time, whether a specific object implements an interface or not, in which case
<code>upcast</code> would fail to compile. <code>dynamic_cast</code> can be used in these circumstances, which
is checking the types at runtime.</p>
<h1 id='example' class='section-header'><a href='#example'>Example</a></h1>
<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
<span class="kw">let</span> <span class="ident">button</span> <span class="op">=</span> <span class="ident">gtk</span>::<span class="ident">Button</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="ident">widget</span> <span class="op">=</span> <span class="ident">button</span>.<span class="ident">upcast</span>::<span class="op">&lt;</span><span class="ident">gtk</span>::<span class="ident">Widget</span><span class="op">&gt;</span>();</pre>
</div><h3 id='method.downcast' class='method'><span id='downcast.v' class='invisible'><code>fn <a href='#method.downcast' class='fnname'>downcast</a>&lt;T&gt;(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;T, Self&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;Self: <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="../../glib/object/trait.Downcast.html" title="trait glib::object::Downcast">Downcast</a>&lt;T&gt;,&nbsp;</span></code></span></h3><div class='docblock'><p>Tries to downcast to a subclass or interface implementor <code>T</code>.</p>
<p>Returns <code>Ok(T)</code> if the object is an instance of <code>T</code> and <code>Err(self)</code>
otherwise.</p>
<p><em>NOTE</em>: This statically checks at compile-time if casting is possible. It is not always
known at compile-time, whether a specific object implements an interface or not, in which case
<code>upcast</code> would fail to compile. <code>dynamic_cast</code> can be used in these circumstances, which
is checking the types at runtime.</p>
<h1 id='example-1' class='section-header'><a href='#example-1'>Example</a></h1>
<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
<span class="kw">let</span> <span class="ident">button</span> <span class="op">=</span> <span class="ident">gtk</span>::<span class="ident">Button</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="ident">widget</span> <span class="op">=</span> <span class="ident">button</span>.<span class="ident">upcast</span>::<span class="op">&lt;</span><span class="ident">gtk</span>::<span class="ident">Widget</span><span class="op">&gt;</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">widget</span>.<span class="ident">downcast</span>::<span class="op">&lt;</span><span class="ident">gtk</span>::<span class="ident">Button</span><span class="op">&gt;</span>().<span class="ident">is_ok</span>());</pre>
</div><h3 id='method.is' class='method'><span id='is.v' class='invisible'><code>fn <a href='#method.is' class='fnname'>is</a>&lt;T&gt;(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a>,&nbsp;</span></code></span></h3><div class='docblock'><p>Returns <code>true</code> if the object is an instance of (can be cast to) <code>T</code>.</p>
</div><h3 id='method.dynamic_cast' class='method'><span id='dynamic_cast.v' class='invisible'><code>fn <a href='#method.dynamic_cast' class='fnname'>dynamic_cast</a>&lt;T&gt;(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;T, Self&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a> + <a class="trait" href="../../glib/wrapper/trait.UnsafeFrom.html" title="trait glib::wrapper::UnsafeFrom">UnsafeFrom</a>&lt;ObjectRef&gt; + <a class="trait" href="../../glib/wrapper/trait.Wrapper.html" title="trait glib::wrapper::Wrapper">Wrapper</a>,&nbsp;</span></code></span></h3><div class='docblock'><p>Tries to cast to an object of type <code>T</code>. This handles upcasting, downcasting
and casting between interface and interface implementors. All checks are performed at
runtime, while <code>downcast</code> and <code>upcast</code> will do many checks at compile-time already.</p>
<p>It is not always known at compile-time, whether a specific object implements an interface or
not, and checking as to be performed at runtime.</p>
<p>Returns <code>Ok(T)</code> if the object is an instance of <code>T</code> and <code>Err(self)</code>
otherwise.</p>
<h1 id='example-2' class='section-header'><a href='#example-2'>Example</a></h1>
<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
<span class="kw">let</span> <span class="ident">button</span> <span class="op">=</span> <span class="ident">gtk</span>::<span class="ident">Button</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="ident">widget</span> <span class="op">=</span> <span class="ident">button</span>.<span class="ident">dynamic_cast</span>::<span class="op">&lt;</span><span class="ident">gtk</span>::<span class="ident">Widget</span><span class="op">&gt;</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">widget</span>.<span class="ident">is_ok</span>);
<span class="kw">let</span> <span class="ident">widget</span> <span class="op">=</span> <span class="ident">widget</span>.<span class="ident">unwrap</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">widget</span>.<span class="ident">dynamic_cast</span>::<span class="op">&lt;</span><span class="ident">gtk</span>::<span class="ident">Button</span><span class="op">&gt;</span>().<span class="ident">is_ok</span>());</pre>
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<pre class='rust trait'>pub trait Downcast&lt;T&gt; {
fn <a href='#tymethod.can_downcast' class='fnname'>can_downcast</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>;
<div class='item-spacer'></div> fn <a href='#tymethod.downcast' class='fnname'>downcast</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;T, Self&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Self: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span>;
<div class='item-spacer'></div> unsafe fn <a href='#tymethod.downcast_unchecked' class='fnname'>downcast_unchecked</a>(self) -&gt; T;
}</pre><div class='docblock'><p>Downcasts support.</p>
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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>(&amp;self) -&gt; <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&#39;s possible to downcast to <code>T</code>.</p>
<p>Returns <code>true</code> if the instance implements <code>T</code> and <code>false</code> otherwise.</p>
</div><h3 id='tymethod.downcast' class='method'><span id='downcast.v' class='invisible'><code>fn <a href='#tymethod.downcast' class='fnname'>downcast</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;T, Self&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;Self: <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></span></h3><div class='docblock'><p>Tries to downcast to <code>T</code>.</p>
<p>Returns <code>Ok(T)</code> if the instance implements <code>T</code> and <code>Err(Self)</code> otherwise.</p>
</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) -&gt; T</code></span></h3><div class='docblock'><p>Downcasts to <code>T</code> unconditionally.</p>
<p>Panics if compiled with <code>debug_assertions</code> and the instance doesn&#39;t implement <code>T</code>.</p>
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<pre class='rust trait'>pub trait IsA&lt;T:&nbsp;<a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a> + <a class="trait" href="../../glib/wrapper/trait.UnsafeFrom.html" title="trait glib::wrapper::UnsafeFrom">UnsafeFrom</a>&lt;ObjectRef&gt; + <a class="trait" href="../../glib/wrapper/trait.Wrapper.html" title="trait glib::wrapper::Wrapper">Wrapper</a>&gt;: <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a> + <a class="trait" href="../../glib/wrapper/trait.Wrapper.html" title="trait glib::wrapper::Wrapper">Wrapper</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;ObjectRef&gt; + <a class="trait" href="../../glib/wrapper/trait.UnsafeFrom.html" title="trait glib::wrapper::UnsafeFrom">UnsafeFrom</a>&lt;ObjectRef&gt; + for&lt;'a&gt; <a class="trait" href="../../glib/translate/trait.ToGlibPtr.html" title="trait glib::translate::ToGlibPtr">ToGlibPtr</a>&lt;'a, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut </a>&lt;T as <a class="trait" href="../../glib/wrapper/trait.Wrapper.html" title="trait glib::wrapper::Wrapper">Wrapper</a>&gt;::<a class="type" href="../../glib/wrapper/trait.Wrapper.html#associatedtype.GlibType" title="type glib::wrapper::Wrapper::GlibType">GlibType</a>&gt; { }</pre><div class='docblock'><p>Declares the &quot;is a&quot; relationship.</p>
<p><code>Self</code> is said to implement <code>T</code>.</p>
<p>For instance, since originally <code>GtkWidget</code> is a subclass of <code>GObject</code> and
implements the <code>GtkBuildable</code> interface, <code>gtk::Widget</code> implements
<code>IsA&lt;glib::Object&gt;</code> and <code>IsA&lt;gtk::Buildable&gt;</code>.</p>
<p>The trait can only be implemented if the appropriate <code>ToGlibPtr</code>
implementations exist.</p>
<p><code>T</code> always implements <code>IsA&lt;T&gt;</code>.</p>
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