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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="Methods for downcasting from an `Any`-like trait object."><title>Downcast in stdx::anymap - 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-84e720fa.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="stdx" data-themes="" data-resource-suffix="" data-rustdoc-version="1.89.0 (29483883e 2025-08-04)" data-channel="1.89.0" data-search-js="search-92309212.js" data-settings-js="settings-5514c975.js" ><script src="../../static.files/storage-4e99c027.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-fd3af306.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="../../stdx/index.html">stdx</a><span class="version">0.0.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Downcast</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.downcast_mut_unchecked" title="downcast_mut_unchecked">downcast_mut_unchecked</a></li><li><a href="#tymethod.downcast_ref_unchecked" title="downcast_ref_unchecked">downcast_ref_unchecked</a></li><li><a href="#tymethod.type_id" title="type_id">type_id</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-Downcast-for-dyn+Any" title="dyn Any">dyn Any</a></li><li><a href="#impl-Downcast-for-dyn+Any+%2B+Send" title="dyn Any + Send">dyn Any + Send</a></li><li><a href="#impl-Downcast-for-dyn+Any+%2B+Send+%2B+Sync" title="dyn Any + Send + Sync">dyn Any + Send + Sync</a></li></ul><h3><a href="#dyn-compatibility">Dyn Compatibility</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In stdx::<wbr>anymap</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">stdx</a>::<wbr><a href="index.html">anymap</a></div><h1>Trait <span class="trait">Downcast</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/stdx/anymap.rs.html#227-255">Source</a> </span></div><pre class="rust item-decl"><code>pub trait Downcast {
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// Required methods
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fn <a href="#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.89.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a>;
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<span class="item-spacer"></span> unsafe fn <a href="#tymethod.downcast_ref_unchecked" class="fn">downcast_ref_unchecked</a><T: 'static>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&T</a>;
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<span class="item-spacer"></span> unsafe fn <a href="#tymethod.downcast_mut_unchecked" class="fn">downcast_mut_unchecked</a><T: 'static>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&mut T</a>;
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Methods for downcasting from an <code>Any</code>-like trait object.</p>
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<p>This should only be implemented on trait objects for subtraits of <code>Any</code>, though you can
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implement it for other types and it’ll work fine, so long as your implementation is correct.</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.type_id" class="method"><a class="src rightside" href="../../src/stdx/anymap.rs.html#229">Source</a><h4 class="code-header">fn <a href="#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.89.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class="docblock"><p>Gets the <code>TypeId</code> of <code>self</code>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.downcast_ref_unchecked" class="method"><a class="src rightside" href="../../src/stdx/anymap.rs.html#247">Source</a><h4 class="code-header">unsafe fn <a href="#tymethod.downcast_ref_unchecked" class="fn">downcast_ref_unchecked</a><T: 'static>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&T</a></h4></section></summary><div class="docblock"><p>Downcast from <code>&Any</code> to <code>&T</code>, without checking the type matches.</p>
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<h5 id="safety"><a class="doc-anchor" href="#safety">§</a>Safety</h5>
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<p>The caller must ensure that <code>T</code> matches the trait object, on pain of <em>undefined behavior</em>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.downcast_mut_unchecked" class="method"><a class="src rightside" href="../../src/stdx/anymap.rs.html#254">Source</a><h4 class="code-header">unsafe fn <a href="#tymethod.downcast_mut_unchecked" class="fn">downcast_mut_unchecked</a><T: 'static>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&mut T</a></h4></section></summary><div class="docblock"><p>Downcast from <code>&mut Any</code> to <code>&mut T</code>, without checking the type matches.</p>
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<h5 id="safety-1"><a class="doc-anchor" href="#safety-1">§</a>Safety</h5>
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<p>The caller must ensure that <code>T</code> matches the trait object, on pain of <em>undefined behavior</em>.</p>
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</div></details></div><h2 id="dyn-compatibility" class="section-header">Dyn Compatibility<a href="#dyn-compatibility" class="anchor">§</a></h2><div class="dyn-compatibility-info"><p>This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.89.0/reference/items/traits.html#dyn-compatibility">dyn compatible</a>.</p><p><i>In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.</i></p></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-Downcast-for-dyn+Any" class="impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#291">Source</a><a href="#impl-Downcast-for-dyn+Any" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Downcast.html" title="trait stdx::anymap::Downcast">Downcast</a> for dyn <a class="trait" href="https://doc.rust-lang.org/1.89.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a></h3></section></summary><div class="impl-items"><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#291">Source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.89.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section><section id="method.downcast_ref_unchecked" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#291">Source</a><a href="#method.downcast_ref_unchecked" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="#tymethod.downcast_ref_unchecked" class="fn">downcast_ref_unchecked</a><T: 'static>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&T</a></h4></section><section id="method.downcast_mut_unchecked" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#291">Source</a><a href="#method.downcast_mut_unchecked" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="#tymethod.downcast_mut_unchecked" class="fn">downcast_mut_unchecked</a><T: 'static>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&mut T</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Downcast-for-dyn+Any+%2B+Send" class="impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#292">Source</a><a href="#impl-Downcast-for-dyn+Any+%2B+Send" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Downcast.html" title="trait stdx::anymap::Downcast">Downcast</a> for dyn <a class="trait" href="https://doc.rust-lang.org/1.89.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> + <a class="trait" href="https://doc.rust-lang.org/1.89.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a></h3></section></summary><div class="impl-items"><section id="method.type_id-1" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#292">Source</a><a href="#method.type_id-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.89.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section><section id="method.downcast_ref_unchecked-1" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#292">Source</a><a href="#method.downcast_ref_unchecked-1" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="#tymethod.downcast_ref_unchecked" class="fn">downcast_ref_unchecked</a><T: 'static>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&T</a></h4></section><section id="method.downcast_mut_unchecked-1" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#292">Source</a><a href="#method.downcast_mut_unchecked-1" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="#tymethod.downcast_mut_unchecked" class="fn">downcast_mut_unchecked</a><T: 'static>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&mut T</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Downcast-for-dyn+Any+%2B+Send+%2B+Sync" class="impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#293">Source</a><a href="#impl-Downcast-for-dyn+Any+%2B+Send+%2B+Sync" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Downcast.html" title="trait stdx::anymap::Downcast">Downcast</a> for dyn <a class="trait" href="https://doc.rust-lang.org/1.89.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> + <a class="trait" href="https://doc.rust-lang.org/1.89.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.89.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a></h3></section></summary><div class="impl-items"><section id="method.type_id-2" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#293">Source</a><a href="#method.type_id-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.89.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section><section id="method.downcast_ref_unchecked-2" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#293">Source</a><a href="#method.downcast_ref_unchecked-2" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="#tymethod.downcast_ref_unchecked" class="fn">downcast_ref_unchecked</a><T: 'static>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&T</a></h4></section><section id="method.downcast_mut_unchecked-2" class="method trait-impl"><a class="src rightside" href="../../src/stdx/anymap.rs.html#293">Source</a><a href="#method.downcast_mut_unchecked-2" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="#tymethod.downcast_mut_unchecked" class="fn">downcast_mut_unchecked</a><T: 'static>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.89.0/std/primitive.reference.html">&mut T</a></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../../trait.impl/stdx/anymap/trait.Downcast.js" data-ignore-extern-crates="core" async></script></section></div></main></body></html> |