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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 `ctlz` fn in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, ctlz"><title>core::intrinsics::ctlz - 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">&#9776;</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'>intrinsics</a></p><script>window.sidebarCurrent = {name: 'ctlz', 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'>intrinsics</a>::<wbr><a class="fn" href=''>ctlz</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></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/intrinsics.rs.html#1234' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub unsafe extern &quot;rust-intrinsic&quot; fn ctlz&lt;T&gt;(x: T) -&gt; T</pre><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API.  (<code>core_intrinsics</code>)</summary><p>intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library</p>
</details></div></div><div class='docblock'><p>Returns the number of leading unset bits (zeroes) in an integer type <code>T</code>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">core_intrinsics</span>)]</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">intrinsics</span>::<span class="ident">ctlz</span>;

<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="number">0b0001_1100_u8</span>;
<span class="kw">let</span> <span class="ident">num_leading</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ctlz</span>(<span class="ident">x</span>) };
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">num_leading</span>, <span class="number">3</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Bfeature(core_intrinsics)%5D%0A%0Aextern%20crate%20core%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Aintrinsics%3A%3Actlz%3B%0A%0Alet%20x%20%3D%200b0001_1100_u8%3B%0Alet%20num_leading%20%3D%20unsafe%20%7B%20ctlz(x)%20%7D%3B%0Aassert_eq!(num_leading%2C%203)%3B%0A%7D&amp;version=nightly">Run</a></pre>
<p>An <code>x</code> with value <code>0</code> will return the bit width of <code>T</code>.</p>

<pre class="rust rust-example-rendered">
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">core_intrinsics</span>)]</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">intrinsics</span>::<span class="ident">ctlz</span>;

<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="number">0u16</span>;
<span class="kw">let</span> <span class="ident">num_leading</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">ctlz</span>(<span class="ident">x</span>) };
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">num_leading</span>, <span class="number">16</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Bfeature(core_intrinsics)%5D%0A%0Aextern%20crate%20core%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Aintrinsics%3A%3Actlz%3B%0A%0Alet%20x%20%3D%200u16%3B%0Alet%20num_leading%20%3D%20unsafe%20%7B%20ctlz(x)%20%7D%3B%0Aassert_eq!(num_leading%2C%2016)%3B%0A%7D&amp;version=nightly">Run</a></pre>
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