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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="API documentation for the Rust `Any` trait in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, Any"><title>core::any::Any - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../light1.35.0.css" id="themeStyle"><script src="../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../core/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a><p class='location'>Trait Any</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.type_id">type_id</a></div><a class="sidebar-title" href="#implementors">Implementors</a><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.downcast_mut">downcast_mut</a><a href="#method.downcast_mut-1">downcast_mut</a><a href="#method.downcast_mut-2">downcast_mut</a><a href="#method.downcast_ref">downcast_ref</a><a href="#method.downcast_ref-1">downcast_ref</a><a href="#method.downcast_ref-2">downcast_ref</a><a href="#method.is">is</a><a href="#method.is-1">is</a><a href="#method.is-2">is</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a></div></div><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>any</a></p><script>window.sidebarCurrent = {name: 'Any', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../../src/core/any.rs.html#78-97' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>core</a>::<wbr><a href='index.html'>any</a>::<wbr><a class="trait" href=''>Any</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait Any: 'static {
    fn <a href='#tymethod.type_id' class='fnname'>type_id</a>(&amp;self) -&gt; <a class="struct" href="../../core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a>;
}</pre></div><div class='docblock'><p>A type to emulate dynamic typing.</p>
<p>Most types implement <code>Any</code>. However, any type which contains a non-<code>'static</code> reference does not.
See the <a href="index.html">module-level documentation</a> for more details.</p>
</div>
            <h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.type_id' class='method'><code id='type_id.v'>fn <a href='#tymethod.type_id' class='fnname'>type_id</a>(&amp;self) -&gt; <a class="struct" href="../../core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><div class='since' title='Stable since Rust version 1.34.0'>1.34.0</div></h3><div class='docblock'><p>Gets the <code>TypeId</code> of <code>self</code>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::{<span class="ident">Any</span>, <span class="ident">TypeId</span>};

<span class="kw">fn</span> <span class="ident">is_string</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">dyn</span> <span class="ident">Any</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
    <span class="ident">TypeId</span>::<span class="ident">of</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>() <span class="op">==</span> <span class="ident">s</span>.<span class="ident">type_id</span>()
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">is_string</span>(<span class="kw-2">&amp;</span><span class="number">0</span>), <span class="bool-val">false</span>);
    <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">is_string</span>(<span class="kw-2">&amp;</span><span class="string">&quot;cookie monster&quot;</span>.<span class="ident">to_string</span>()), <span class="bool-val">true</span>);
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3A%7BAny%2C%20TypeId%7D%3B%0A%0Afn%20is_string(s%3A%20%26dyn%20Any)%20-%3E%20bool%20%7B%0A%20%20%20%20TypeId%3A%3Aof%3A%3A%3CString%3E()%20%3D%3D%20s.type_id()%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20assert_eq!(is_string(%260)%2C%20false)%3B%0A%20%20%20%20assert_eq!(is_string(%26%22cookie%20monster%22.to_string())%2C%20true)%3B%0A%7D">Run</a></pre></div>
</div></div><span class='loading-content'>Loading content...</span><h2 id='methods' class='small-section-header'>Methods<a href='#methods' class='anchor'></a></h2><h3 id='impl' class='impl'><code class='in-band'>impl dyn <a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a></code><a href='#impl' class='anchor'></a><a class='srclink' href='../../src/core/any.rs.html#132-235' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.is' class="method"><code id='is.v'>pub fn <a href='#method.is' class='fnname'>is</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;self) -&gt; bool</code><a class='srclink' href='../../src/core/any.rs.html#155-164' title='goto source code'>[src]</a></h4><div class='docblock'><p>Returns <code>true</code> if the boxed type is the same as <code>T</code>.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">is_string</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">dyn</span> <span class="ident">Any</span>) {
    <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">is</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>() {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;It&#39;s a string!&quot;</span>);
    } <span class="kw">else</span> {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;Not a string...&quot;</span>);
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="ident">is_string</span>(<span class="kw-2">&amp;</span><span class="number">0</span>);
    <span class="ident">is_string</span>(<span class="kw-2">&amp;</span><span class="string">&quot;cookie monster&quot;</span>.<span class="ident">to_string</span>());
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20is_string(s%3A%20%26dyn%20Any)%20%7B%0A%20%20%20%20if%20s.is%3A%3A%3CString%3E()%20%7B%0A%20%20%20%20%20%20%20%20println!(%22It's%20a%20string!%22)%3B%0A%20%20%20%20%7D%20else%20%7B%0A%20%20%20%20%20%20%20%20println!(%22Not%20a%20string...%22)%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20is_string(%260)%3B%0A%20%20%20%20is_string(%26%22cookie%20monster%22.to_string())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.downcast_ref' class="method"><code id='downcast_ref.v'>pub fn <a href='#method.downcast_ref' class='fnname'>downcast_ref</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;self) -&gt; <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;T&gt;</code><a class='srclink' href='../../src/core/any.rs.html#189-197' title='goto source code'>[src]</a></h4><div class='docblock'><p>Returns some reference to the boxed value if it is of type <code>T</code>, or
<code>None</code> if it isn't.</p>
<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">print_if_string</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">dyn</span> <span class="ident">Any</span>) {
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">string</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">downcast_ref</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>() {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;It&#39;s a string({}): &#39;{}&#39;&quot;</span>, <span class="ident">string</span>.<span class="ident">len</span>(), <span class="ident">string</span>);
    } <span class="kw">else</span> {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;Not a string...&quot;</span>);
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="ident">print_if_string</span>(<span class="kw-2">&amp;</span><span class="number">0</span>);
    <span class="ident">print_if_string</span>(<span class="kw-2">&amp;</span><span class="string">&quot;cookie monster&quot;</span>.<span class="ident">to_string</span>());
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20print_if_string(s%3A%20%26dyn%20Any)%20%7B%0A%20%20%20%20if%20let%20Some(string)%20%3D%20s.downcast_ref%3A%3A%3CString%3E()%20%7B%0A%20%20%20%20%20%20%20%20println!(%22It's%20a%20string(%7B%7D)%3A%20'%7B%7D'%22%2C%20string.len()%2C%20string)%3B%0A%20%20%20%20%7D%20else%20%7B%0A%20%20%20%20%20%20%20%20println!(%22Not%20a%20string...%22)%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20print_if_string(%260)%3B%0A%20%20%20%20print_if_string(%26%22cookie%20monster%22.to_string())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.downcast_mut' class="method"><code id='downcast_mut.v'>pub fn <a href='#method.downcast_mut' class='fnname'>downcast_mut</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;mut self) -&gt; <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;mut T&gt;</code><a class='srclink' href='../../src/core/any.rs.html#226-234' title='goto source code'>[src]</a></h4><div class='docblock'><p>Returns some mutable reference to the boxed value if it is of type <code>T</code>, or
<code>None</code> if it isn't.</p>
<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">modify_if_u32</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">dyn</span> <span class="ident">Any</span>) {
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">num</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">downcast_mut</span>::<span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>() {
        <span class="kw-2">*</span><span class="ident">num</span> <span class="op">=</span> <span class="number">42</span>;
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x</span> <span class="op">=</span> <span class="number">10u32</span>;
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;starlord&quot;</span>.<span class="ident">to_string</span>();

    <span class="ident">modify_if_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">x</span>);
    <span class="ident">modify_if_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">s</span>);

    <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="number">42</span>);
    <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>, <span class="string">&quot;starlord&quot;</span>);
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20modify_if_u32(s%3A%20%26mut%20dyn%20Any)%20%7B%0A%20%20%20%20if%20let%20Some(num)%20%3D%20s.downcast_mut%3A%3A%3Cu32%3E()%20%7B%0A%20%20%20%20%20%20%20%20*num%20%3D%2042%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20let%20mut%20x%20%3D%2010u32%3B%0A%20%20%20%20let%20mut%20s%20%3D%20%22starlord%22.to_string()%3B%0A%0A%20%20%20%20modify_if_u32(%26mut%20x)%3B%0A%20%20%20%20modify_if_u32(%26mut%20s)%3B%0A%0A%20%20%20%20assert_eq!(x%2C%2042)%3B%0A%20%20%20%20assert_eq!(%26s%2C%20%22starlord%22)%3B%0A%7D">Run</a></pre></div>
</div></div><h3 id='impl-1' class='impl'><code class='in-band'>impl dyn <a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a> + <a class="trait" href="../../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a></code><a href='#impl-1' class='anchor'></a><a class='srclink' href='../../src/core/any.rs.html#237-319' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.is-1' class="method"><code id='is.v-1'>pub fn <a href='#method.is-1' class='fnname'>is</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;self) -&gt; bool</code><a class='srclink' href='../../src/core/any.rs.html#260-262' title='goto source code'>[src]</a></h4><div class='docblock'><p>Forwards to the method defined on the type <code>Any</code>.</p>
<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">is_string</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span>(<span class="ident">dyn</span> <span class="ident">Any</span> <span class="op">+</span> <span class="ident">Send</span>)) {
    <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">is</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>() {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;It&#39;s a string!&quot;</span>);
    } <span class="kw">else</span> {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;Not a string...&quot;</span>);
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="ident">is_string</span>(<span class="kw-2">&amp;</span><span class="number">0</span>);
    <span class="ident">is_string</span>(<span class="kw-2">&amp;</span><span class="string">&quot;cookie monster&quot;</span>.<span class="ident">to_string</span>());
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20is_string(s%3A%20%26(dyn%20Any%20%2B%20Send))%20%7B%0A%20%20%20%20if%20s.is%3A%3A%3CString%3E()%20%7B%0A%20%20%20%20%20%20%20%20println!(%22It's%20a%20string!%22)%3B%0A%20%20%20%20%7D%20else%20%7B%0A%20%20%20%20%20%20%20%20println!(%22Not%20a%20string...%22)%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20is_string(%260)%3B%0A%20%20%20%20is_string(%26%22cookie%20monster%22.to_string())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.downcast_ref-1' class="method"><code id='downcast_ref.v-1'>pub fn <a href='#method.downcast_ref-1' class='fnname'>downcast_ref</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;self) -&gt; <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;T&gt;</code><a class='srclink' href='../../src/core/any.rs.html#286-288' title='goto source code'>[src]</a></h4><div class='docblock'><p>Forwards to the method defined on the type <code>Any</code>.</p>
<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">print_if_string</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span>(<span class="ident">dyn</span> <span class="ident">Any</span> <span class="op">+</span> <span class="ident">Send</span>)) {
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">string</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">downcast_ref</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>() {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;It&#39;s a string({}): &#39;{}&#39;&quot;</span>, <span class="ident">string</span>.<span class="ident">len</span>(), <span class="ident">string</span>);
    } <span class="kw">else</span> {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;Not a string...&quot;</span>);
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="ident">print_if_string</span>(<span class="kw-2">&amp;</span><span class="number">0</span>);
    <span class="ident">print_if_string</span>(<span class="kw-2">&amp;</span><span class="string">&quot;cookie monster&quot;</span>.<span class="ident">to_string</span>());
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20print_if_string(s%3A%20%26(dyn%20Any%20%2B%20Send))%20%7B%0A%20%20%20%20if%20let%20Some(string)%20%3D%20s.downcast_ref%3A%3A%3CString%3E()%20%7B%0A%20%20%20%20%20%20%20%20println!(%22It's%20a%20string(%7B%7D)%3A%20'%7B%7D'%22%2C%20string.len()%2C%20string)%3B%0A%20%20%20%20%7D%20else%20%7B%0A%20%20%20%20%20%20%20%20println!(%22Not%20a%20string...%22)%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20print_if_string(%260)%3B%0A%20%20%20%20print_if_string(%26%22cookie%20monster%22.to_string())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.downcast_mut-1' class="method"><code id='downcast_mut.v-1'>pub fn <a href='#method.downcast_mut-1' class='fnname'>downcast_mut</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;mut self) -&gt; <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;mut T&gt;</code><a class='srclink' href='../../src/core/any.rs.html#316-318' title='goto source code'>[src]</a></h4><div class='docblock'><p>Forwards to the method defined on the type <code>Any</code>.</p>
<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">modify_if_u32</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> (<span class="ident">dyn</span> <span class="ident">Any</span> <span class="op">+</span> <span class="ident">Send</span>)) {
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">num</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">downcast_mut</span>::<span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>() {
        <span class="kw-2">*</span><span class="ident">num</span> <span class="op">=</span> <span class="number">42</span>;
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x</span> <span class="op">=</span> <span class="number">10u32</span>;
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;starlord&quot;</span>.<span class="ident">to_string</span>();

    <span class="ident">modify_if_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">x</span>);
    <span class="ident">modify_if_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">s</span>);

    <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="number">42</span>);
    <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>, <span class="string">&quot;starlord&quot;</span>);
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20modify_if_u32(s%3A%20%26mut%20(dyn%20Any%20%2B%20Send))%20%7B%0A%20%20%20%20if%20let%20Some(num)%20%3D%20s.downcast_mut%3A%3A%3Cu32%3E()%20%7B%0A%20%20%20%20%20%20%20%20*num%20%3D%2042%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20let%20mut%20x%20%3D%2010u32%3B%0A%20%20%20%20let%20mut%20s%20%3D%20%22starlord%22.to_string()%3B%0A%0A%20%20%20%20modify_if_u32(%26mut%20x)%3B%0A%20%20%20%20modify_if_u32(%26mut%20s)%3B%0A%0A%20%20%20%20assert_eq!(x%2C%2042)%3B%0A%20%20%20%20assert_eq!(%26s%2C%20%22starlord%22)%3B%0A%7D">Run</a></pre></div>
</div></div><h3 id='impl-2' class='impl'><code class='in-band'>impl dyn <a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a> + <a class="trait" href="../../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="../../core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a></code><a href='#impl-2' class='anchor'></a><a class='srclink' href='../../src/core/any.rs.html#321-403' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.is-2' class="method"><code id='is.v-2'>pub fn <a href='#method.is-2' class='fnname'>is</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;self) -&gt; bool</code><div class='since' title='Stable since Rust version 1.28.0'>1.28.0</div><a class='srclink' href='../../src/core/any.rs.html#344-346' title='goto source code'>[src]</a></h4><div class='docblock'><p>Forwards to the method defined on the type <code>Any</code>.</p>
<h1 id="examples-7" class="section-header"><a href="#examples-7">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">is_string</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span>(<span class="ident">dyn</span> <span class="ident">Any</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span>)) {
    <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">is</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>() {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;It&#39;s a string!&quot;</span>);
    } <span class="kw">else</span> {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;Not a string...&quot;</span>);
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="ident">is_string</span>(<span class="kw-2">&amp;</span><span class="number">0</span>);
    <span class="ident">is_string</span>(<span class="kw-2">&amp;</span><span class="string">&quot;cookie monster&quot;</span>.<span class="ident">to_string</span>());
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20is_string(s%3A%20%26(dyn%20Any%20%2B%20Send%20%2B%20Sync))%20%7B%0A%20%20%20%20if%20s.is%3A%3A%3CString%3E()%20%7B%0A%20%20%20%20%20%20%20%20println!(%22It's%20a%20string!%22)%3B%0A%20%20%20%20%7D%20else%20%7B%0A%20%20%20%20%20%20%20%20println!(%22Not%20a%20string...%22)%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20is_string(%260)%3B%0A%20%20%20%20is_string(%26%22cookie%20monster%22.to_string())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.downcast_ref-2' class="method"><code id='downcast_ref.v-2'>pub fn <a href='#method.downcast_ref-2' class='fnname'>downcast_ref</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;self) -&gt; <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;T&gt;</code><div class='since' title='Stable since Rust version 1.28.0'>1.28.0</div><a class='srclink' href='../../src/core/any.rs.html#370-372' title='goto source code'>[src]</a></h4><div class='docblock'><p>Forwards to the method defined on the type <code>Any</code>.</p>
<h1 id="examples-8" class="section-header"><a href="#examples-8">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">print_if_string</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span>(<span class="ident">dyn</span> <span class="ident">Any</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span>)) {
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">string</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">downcast_ref</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>() {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;It&#39;s a string({}): &#39;{}&#39;&quot;</span>, <span class="ident">string</span>.<span class="ident">len</span>(), <span class="ident">string</span>);
    } <span class="kw">else</span> {
        <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;Not a string...&quot;</span>);
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="ident">print_if_string</span>(<span class="kw-2">&amp;</span><span class="number">0</span>);
    <span class="ident">print_if_string</span>(<span class="kw-2">&amp;</span><span class="string">&quot;cookie monster&quot;</span>.<span class="ident">to_string</span>());
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20print_if_string(s%3A%20%26(dyn%20Any%20%2B%20Send%20%2B%20Sync))%20%7B%0A%20%20%20%20if%20let%20Some(string)%20%3D%20s.downcast_ref%3A%3A%3CString%3E()%20%7B%0A%20%20%20%20%20%20%20%20println!(%22It's%20a%20string(%7B%7D)%3A%20'%7B%7D'%22%2C%20string.len()%2C%20string)%3B%0A%20%20%20%20%7D%20else%20%7B%0A%20%20%20%20%20%20%20%20println!(%22Not%20a%20string...%22)%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20print_if_string(%260)%3B%0A%20%20%20%20print_if_string(%26%22cookie%20monster%22.to_string())%3B%0A%7D">Run</a></pre></div>
</div><h4 id='method.downcast_mut-2' class="method"><code id='downcast_mut.v-2'>pub fn <a href='#method.downcast_mut-2' class='fnname'>downcast_mut</a>&lt;T:&nbsp;<a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a>&gt;(&amp;mut self) -&gt; <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;mut T&gt;</code><div class='since' title='Stable since Rust version 1.28.0'>1.28.0</div><a class='srclink' href='../../src/core/any.rs.html#400-402' title='goto source code'>[src]</a></h4><div class='docblock'><p>Forwards to the method defined on the type <code>Any</code>.</p>
<h1 id="examples-9" class="section-header"><a href="#examples-9">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::<span class="ident">Any</span>;

<span class="kw">fn</span> <span class="ident">modify_if_u32</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> (<span class="ident">dyn</span> <span class="ident">Any</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span>)) {
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">num</span>) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">downcast_mut</span>::<span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>() {
        <span class="kw-2">*</span><span class="ident">num</span> <span class="op">=</span> <span class="number">42</span>;
    }
}

<span class="kw">fn</span> <span class="ident">main</span>() {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x</span> <span class="op">=</span> <span class="number">10u32</span>;
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;starlord&quot;</span>.<span class="ident">to_string</span>();

    <span class="ident">modify_if_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">x</span>);
    <span class="ident">modify_if_u32</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">s</span>);

    <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="number">42</span>);
    <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>, <span class="string">&quot;starlord&quot;</span>);
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Aany%3A%3AAny%3B%0A%0Afn%20modify_if_u32(s%3A%20%26mut%20(dyn%20Any%20%2B%20Send%20%2B%20Sync))%20%7B%0A%20%20%20%20if%20let%20Some(num)%20%3D%20s.downcast_mut%3A%3A%3Cu32%3E()%20%7B%0A%20%20%20%20%20%20%20%20*num%20%3D%2042%3B%0A%20%20%20%20%7D%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20let%20mut%20x%20%3D%2010u32%3B%0A%20%20%20%20let%20mut%20s%20%3D%20%22starlord%22.to_string()%3B%0A%0A%20%20%20%20modify_if_u32(%26mut%20x)%3B%0A%20%20%20%20modify_if_u32(%26mut%20s)%3B%0A%0A%20%20%20%20assert_eq!(x%2C%2042)%3B%0A%20%20%20%20assert_eq!(%26s%2C%20%22starlord%22)%3B%0A%7D">Run</a></pre></div>
</div></div><h2 id='implementations' class='small-section-header'>Trait Implementations<a href='#implementations' class='anchor'></a></h2><div id='implementations-list'><h3 id='impl-Debug' class='impl'><code class='in-band'>impl <a class="trait" href="../../core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for dyn <a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a></code><a href='#impl-Debug' class='anchor'></a><a class='srclink' href='../../src/core/any.rs.html#109-113' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt' class="method hidden"><code id='fmt.v'>fn <a href='../../core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="../../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code><a class='srclink' href='../../src/core/any.rs.html#110-112' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Formats the value using the given formatter. <a href="../../core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Debug-1' class='impl'><code class='in-band'>impl <a class="trait" href="../../core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for dyn <a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a> + <a class="trait" href="../../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a></code><a href='#impl-Debug-1' class='anchor'></a><a class='srclink' href='../../src/core/any.rs.html#119-123' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt-1' class="method hidden"><code id='fmt.v-1'>fn <a href='../../core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="../../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code><a class='srclink' href='../../src/core/any.rs.html#120-122' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Formats the value using the given formatter. <a href="../../core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Debug-2' class='impl'><code class='in-band'>impl <a class="trait" href="../../core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for dyn <a class="trait" href="../../core/any/trait.Any.html" title="trait core::any::Any">Any</a> + <a class="trait" href="../../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="../../core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a></code><a href='#impl-Debug-2' class='anchor'></a><div class='since' title='Stable since Rust version 1.28.0'>1.28.0</div><a class='srclink' href='../../src/core/any.rs.html#126-130' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt-2' class="method hidden"><code id='fmt.v-2'>fn <a href='../../core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="../../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="../../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code><a class='srclink' href='../../src/core/any.rs.html#127-129' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Formats the value using the given formatter. <a href="../../core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div></div>
            <h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-Any' class='impl'><code class='in-band'>impl&lt;T:&nbsp;'static + ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt; Any for T</code><a href='#impl-Any' class='anchor'></a><a class='srclink' href='../../src/core/any.rs.html#100-102' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.type_id' class="method hidden"><code id='type_id.v-1'>fn <a href='#method.type_id' class='fnname'>type_id</a>(&amp;self) -&gt; <a class="struct" href="../../core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><a class='srclink' href='../../src/core/any.rs.html#101' title='goto source code'>[src]</a></h4></div></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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