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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A trait representing your data associated to an object"><title>ObjectData in cosmic::cctk::sctk::reexports::client::backend - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../../../static.files/rustdoc-aa0817cf.css"><meta name="rustdoc-vars" data-root-path="../../../../../../" data-static-root-path="../../../../../../static.files/" data-current-crate="cosmic" data-themes="" data-resource-suffix="" data-rustdoc-version="1.90.0-nightly (3048886e5 2025-07-30)" data-channel="nightly" data-search-js="search-fa3e91e5.js" data-settings-js="settings-5514c975.js" ><script src="../../../../../../static.files/storage-68b7e25d.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../../../../static.files/main-eebb9057.js"></script><noscript><link rel="stylesheet" href="../../../../../../static.files/noscript-32bb7600.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../../../../cosmic/index.html">cosmic</a><span class="version">1.0.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Object<wbr>Data</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.destroyed" title="destroyed">destroyed</a></li><li><a href="#tymethod.event" title="event">event</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.data_as_any" title="data_as_any">data_as_any</a></li><li><a href="#method.debug" title="debug">debug</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.downcast" title="downcast">downcast</a></li><li><a href="#method.downcast_arc" title="downcast_arc">downcast_arc</a></li><li><a href="#method.downcast_mut" title="downcast_mut">downcast_mut</a></li><li><a href="#method.downcast_rc" title="downcast_rc">downcast_rc</a></li><li><a href="#method.downcast_ref" title="downcast_ref">downcast_ref</a></li><li><a href="#method.is" title="is">is</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-dyn+ObjectData" title="Debug">Debug</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In cosmic::<wbr>cctk::<wbr>sctk::<wbr>reexports::<wbr>client::<wbr>backend</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../../../../index.html">cosmic</a>::<wbr><a href="../../../../index.html">cctk</a>::<wbr><a href="../../../index.html">sctk</a>::<wbr><a href="../../index.html">reexports</a>::<wbr><a href="../index.html">client</a>::<wbr><a href="index.html">backend</a></div><h1>Trait <span class="trait">ObjectData</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"></span></div><pre class="rust item-decl"><code>pub trait ObjectData: DowncastSync {
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// Required methods
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fn <a href="#tymethod.event" class="fn">event</a>(
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self: <a class="struct" href="smallvec/alloc/sync/struct.Arc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::sync::Arc">Arc</a><Self>,
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backend: &<a class="struct" href="struct.Backend.html" title="struct cosmic::cctk::sctk::reexports::client::backend::Backend">Backend</a>,
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msg: <a class="struct" href="protocol/struct.Message.html" title="struct cosmic::cctk::sctk::reexports::client::backend::protocol::Message">Message</a><<a class="struct" href="struct.ObjectId.html" title="struct cosmic::cctk::sctk::reexports::client::backend::ObjectId">ObjectId</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/os/fd/owned/struct.OwnedFd.html" title="struct std::os::fd::owned::OwnedFd">OwnedFd</a>>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="smallvec/alloc/sync/struct.Arc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::sync::Arc">Arc</a><dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>>>;
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<span class="item-spacer"></span> fn <a href="#tymethod.destroyed" class="fn">destroyed</a>(&self, object_id: <a class="struct" href="struct.ObjectId.html" title="struct cosmic::cctk::sctk::reexports::client::backend::ObjectId">ObjectId</a>);
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// Provided methods
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fn <a href="#method.debug" class="fn">debug</a>(&self, f: &mut <a class="struct" href="smallvec/alloc/fmt/struct.Formatter.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::fmt::Formatter">Formatter</a><'_>) -> <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="smallvec/alloc/fmt/struct.Error.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::fmt::Error">Error</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.data_as_any" class="fn">data_as_any</a>(&self) -> &(dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> + 'static) { ... }
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}</code></pre><span class="item-info"><div class="stab portability">Available on <strong>crate feature <code>wayland</code> and Linux</strong> only.</div></span><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A trait representing your data associated to an object</p>
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<p>You will only be given access to it as a <code>&</code> reference, so you
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need to handle interior mutability by yourself.</p>
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<p>The methods of this trait will be invoked internally every time a
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new object is created to initialize its data.</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.event" class="method"><h4 class="code-header">fn <a href="#tymethod.event" class="fn">event</a>(
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self: <a class="struct" href="smallvec/alloc/sync/struct.Arc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::sync::Arc">Arc</a><Self>,
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backend: &<a class="struct" href="struct.Backend.html" title="struct cosmic::cctk::sctk::reexports::client::backend::Backend">Backend</a>,
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msg: <a class="struct" href="protocol/struct.Message.html" title="struct cosmic::cctk::sctk::reexports::client::backend::protocol::Message">Message</a><<a class="struct" href="struct.ObjectId.html" title="struct cosmic::cctk::sctk::reexports::client::backend::ObjectId">ObjectId</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/std/os/fd/owned/struct.OwnedFd.html" title="struct std::os::fd::owned::OwnedFd">OwnedFd</a>>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="smallvec/alloc/sync/struct.Arc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::sync::Arc">Arc</a><dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>>></h4></section></summary><div class="docblock"><p>Dispatch an event for the associated object</p>
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<p>If the event has a <code>NewId</code> argument, the callback must return the object data
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for the newly created object</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.destroyed" class="method"><h4 class="code-header">fn <a href="#tymethod.destroyed" class="fn">destroyed</a>(&self, object_id: <a class="struct" href="struct.ObjectId.html" title="struct cosmic::cctk::sctk::reexports::client::backend::ObjectId">ObjectId</a>)</h4></section></summary><div class="docblock"><p>Notification that the object has been destroyed and is no longer active</p>
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</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.debug" class="method"><h4 class="code-header">fn <a href="#method.debug" class="fn">debug</a>(&self, f: &mut <a class="struct" href="smallvec/alloc/fmt/struct.Formatter.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::fmt::Formatter">Formatter</a><'_>) -> <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="smallvec/alloc/fmt/struct.Error.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::fmt::Error">Error</a>></h4></section></summary><div class="docblock"><p>Helper for forwarding a Debug implementation of your <code>ObjectData</code> type</p>
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<p>By default will just print <code>ObjectData { ... }</code></p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.data_as_any" class="method"><h4 class="code-header">fn <a href="#method.data_as_any" class="fn">data_as_any</a>(&self) -> &(dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> + 'static)</h4></section></summary><div class="docblock"><p>Helper for accessing user data</p>
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<p>This function is used to back the <code>Proxy::data()</code> function in <code>wayland_client</code>. By default,
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it returns <code>self</code> (via [<code>Downcast</code>][downcast_rs::DowncastSync]), but this may be overridden to allow downcasting user data
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without needing to have access to the full type.</p>
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</div></details></div><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-dyn+ObjectData" class="impl"><a href="#impl-dyn+ObjectData" class="anchor">§</a><h3 class="code-header">impl dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.is" class="method"><h4 class="code-header">pub fn <a href="#method.is" class="fn">is</a><__T>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><div class="where">where
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__T: <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>,</div></h4></section></summary><div class="docblock"><p>Returns true if the trait object wraps an object of type <code>__T</code>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.downcast" class="method"><h4 class="code-header">pub fn <a href="#method.downcast" class="fn">downcast</a><__T>(
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self: <a class="struct" href="smallvec/alloc/boxed/struct.Box.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::boxed::Box">Box</a><dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="smallvec/alloc/boxed/struct.Box.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::boxed::Box">Box</a><__T>, <a class="struct" href="smallvec/alloc/boxed/struct.Box.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::boxed::Box">Box</a><dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>>><div class="where">where
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__T: <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>,</div></h4></section></summary><div class="docblock"><p>Returns a boxed object from a boxed trait object if the underlying object is of type
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<code>__T</code>. Returns the original boxed trait if it isn’t.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.downcast_rc" class="method"><h4 class="code-header">pub fn <a href="#method.downcast_rc" class="fn">downcast_rc</a><__T>(
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self: <a class="struct" href="smallvec/alloc/rc/struct.Rc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::rc::Rc">Rc</a><dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="smallvec/alloc/rc/struct.Rc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::rc::Rc">Rc</a><__T>, <a class="struct" href="smallvec/alloc/rc/struct.Rc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::rc::Rc">Rc</a><dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>>><div class="where">where
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__T: <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>,</div></h4></section></summary><div class="docblock"><p>Returns an <code>Rc</code>-ed object from an <code>Rc</code>-ed trait object if the underlying object is of
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type <code>__T</code>. Returns the original <code>Rc</code>-ed trait if it isn’t.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.downcast_ref" class="method"><h4 class="code-header">pub fn <a href="#method.downcast_ref" class="fn">downcast_ref</a><__T>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&__T</a>><div class="where">where
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__T: <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>,</div></h4></section></summary><div class="docblock"><p>Returns a reference to the object within the trait object if it is of type <code>__T</code>, or
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<code>None</code> if it isn’t.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.downcast_mut" class="method"><h4 class="code-header">pub fn <a href="#method.downcast_mut" class="fn">downcast_mut</a><__T>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut __T</a>><div class="where">where
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__T: <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>,</div></h4></section></summary><div class="docblock"><p>Returns a mutable reference to the object within the trait object if it is of type
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<code>__T</code>, or <code>None</code> if it isn’t.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.downcast_arc" class="method"><h4 class="code-header">pub fn <a href="#method.downcast_arc" class="fn">downcast_arc</a><__T>(
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self: <a class="struct" href="smallvec/alloc/sync/struct.Arc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::sync::Arc">Arc</a><dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>>,
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) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="smallvec/alloc/sync/struct.Arc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::sync::Arc">Arc</a><__T>, <a class="struct" href="smallvec/alloc/sync/struct.Arc.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::sync::Arc">Arc</a><dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a>>><div class="where">where
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||||
__T: <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> + <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>,</div></h4></section></summary><div class="docblock"><p>Returns an <code>Arc</code>-ed object from an <code>Arc</code>-ed trait object if the underlying object is of
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type <code>__T</code>. Returns the original <code>Arc</code>-ed trait if it isn’t.</p>
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||||
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-dyn+ObjectData" class="impl"><a href="#impl-Debug-for-dyn+ObjectData" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="smallvec/alloc/fmt/trait.Debug.html" title="trait cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::fmt::Debug">Debug</a> for dyn <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="smallvec/alloc/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="smallvec/alloc/fmt/struct.Formatter.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::fmt::Formatter">Formatter</a><'_>) -> <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="smallvec/alloc/fmt/struct.Error.html" title="struct cosmic::cctk::sctk::reexports::client::backend::smallvec::alloc::fmt::Error">Error</a>></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="smallvec/alloc/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-ObjectData-for-QueueProxyData%3CI,+U,+State%3E" class="impl"><a href="#impl-ObjectData-for-QueueProxyData%3CI,+U,+State%3E" class="anchor">§</a><h3 class="code-header">impl<I, U, State> <a class="trait" href="trait.ObjectData.html" title="trait cosmic::cctk::sctk::reexports::client::backend::ObjectData">ObjectData</a> for <a class="struct" href="../struct.QueueProxyData.html" title="struct cosmic::cctk::sctk::reexports::client::QueueProxyData">QueueProxyData</a><I, U, State><div class="where">where
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I: <a class="trait" href="../trait.Proxy.html" title="trait cosmic::cctk::sctk::reexports::client::Proxy">Proxy</a> + 'static,
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U: <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> + 'static,
|
||||
State: <a class="trait" href="../trait.Dispatch.html" title="trait cosmic::cctk::sctk::reexports::client::Dispatch">Dispatch</a><I, U> + 'static,</div></h3></section></div><script src="../../../../../../trait.impl/wayland_backend/sys/client/trait.ObjectData.js" data-ignore-extern-crates="wayland_client" async></script></section></div></main></body></html>
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