<!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 `from_u32_unchecked` fn in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, from_u32_unchecked"><title>core::char::from_u32_unchecked - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc fn"><!--[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">☰</div><a href='../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a><div class="sidebar-elems"><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>char</a></p><script>window.sidebarCurrent = {name: 'from_u32_unchecked', ty: 'fn', 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="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>core</a>::<wbr><a href='index.html'>char</a>::<wbr><a class="fn" href=''>from_u32_unchecked</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.5.0'>1.5.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/core/char/convert.rs.html#112-114' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub unsafe fn from_u32_unchecked(i: u32) -> char</pre><div class='docblock'><p>Converts a <code>u32</code> to a <code>char</code>, ignoring validity.</p>
<p>Note that all <a href="../../std/primitive.char.html"><code>char</code></a>s are valid <a href="../../std/primitive.u32.html"><code>u32</code></a>s, and can be cast to one with
<a href="../../book/first-edition/casting-between-types.html#as"><code>as</code></a>:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="string">'💯'</span>;
<span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="ident">c</span> <span class="kw">as</span> <span class="ident">u32</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">128175</span>, <span class="ident">i</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20c%20%3D%20'%F0%9F%92%AF'%3B%0Alet%20i%20%3D%20c%20as%20u32%3B%0A%0Aassert_eq!(128175%2C%20i)%3B%0A%7D">Run</a></pre>
<p>However, the reverse is not true: not all valid <a href="../../std/primitive.u32.html"><code>u32</code></a>s are valid
<a href="../../std/primitive.char.html"><code>char</code></a>s. <code>from_u32_unchecked()</code> will ignore this, and blindly cast to
<a href="../../std/primitive.char.html"><code>char</code></a>, possibly creating an invalid one.</p>
<h1 id="safety" class="section-header"><a href="#safety">Safety</a></h1>
<p>This function is unsafe, as it may construct invalid <code>char</code> values.</p>
<p>For a safe version of this function, see the <a href="fn.from_u32.html"><code>from_u32</code></a> function.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">char</span>;
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">char</span>::<span class="ident">from_u32_unchecked</span>(<span class="number">0x2764</span>) };
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">'❤'</span>, <span class="ident">c</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Achar%3B%0A%0Alet%20c%20%3D%20unsafe%20%7B%20char%3A%3Afrom_u32_unchecked(0x2764)%20%7D%3B%0A%0Aassert_eq!('%E2%9D%A4'%2C%20c)%3B%0A%7D">Run</a></pre>
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