<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `AsPrimitive` trait in crate `num_traits`."><metaname="keywords"content="rust, rustlang, rust-lang, AsPrimitive"><title>num_traits::AsPrimitive - Rust</title><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../dark.css"><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><scriptsrc="../storage.js"></script><noscript><linkrel="stylesheet"href="../noscript.css"></noscript><linkrel="shortcut icon"href="../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><bodyclass="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../num_traits/index.html'><divclass='logo-container'><imgsrc='../rust-logo.png'alt='logo'></div></a><pclass='location'>Trait AsPrimitive</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#required-methods">Required Methods</a><divclass="sidebar-links"><ahref="#tymethod.as_">as_</a></div><aclass="sidebar-title"href="#foreign-impls">Implementations on Foreign Types</a><divclass="sidebar-links"><ahref="#impl-AsPrimitive%3Cchar%3E-for-char">char</a><ahref="#impl-AsPrimitive%3Cchar%3E-for-u8">u8</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-f32">f32</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-f64">f64</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-i128">i128</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-i16">i16</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-i32">i32</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-i64">i64</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-i8">i8</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-isize">isize</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-u128">u128</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-u16">u16</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-u32">u32</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-u64">u64</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-u8">u8</a><ahref="#impl-AsPrimitive%3Cf32%3E-for-usize">usize</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-f32">f32</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-f64">f64</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-i128">i128</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-i16">i16</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-i32">i32</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-i64">i64</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-i8">i8</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-isize">isize</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-u128">u128</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-u16">u16</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-u32">u32</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-u64">u64</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-u8">u8</a><ahref="#impl-AsPrimitive%3Cf64%3E-for-usize">usize</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-bool">bool</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-char">char</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-f32">f32</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-f64">f64</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-i128">i128</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-i16">i16</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-i32">i32</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-i64">i64</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-i8">i8</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-isize">isize</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-u128">u128</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-u16">u16</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-u32">u32</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-u64">u64</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-u8">u8</a><ahref="#impl-AsPrimitive%3Ci128%3E-for-usize">usize</a><ahref="#impl-AsPrimitive%3Ci16%3E-for-bool">bool</a><ahref="#impl-A
<p>Currently, some uses of the <code>as</code> operator are not entirely safe.
In particular, it is undefined behavior if:</p>
<ul>
<li>A truncated floating point value cannot fit in the target integer
type (<ahref="https://github.com/rust-lang/rust/issues/10184">#10184</a>);</li>
</ul>
<divclass='information'><divclass='tooltip ignore'>ⓘ<spanclass='tooltiptext'>This example is not tested</span></div></div><divclass="example-wrap"><preclass="rust rust-example-rendered ignore">
<li>Or a floating point value does not fit in another floating
point type (<ahref="https://github.com/rust-lang/rust/issues/15536">#15536</a>).</li>
</ul>
<divclass='information'><divclass='tooltip ignore'>ⓘ<spanclass='tooltiptext'>This example is not tested</span></div></div><divclass="example-wrap"><preclass="rust rust-example-rendered ignore">
<h2id='required-methods'class='small-section-header'>Required methods<ahref='#required-methods'class='anchor'></a></h2><divclass='methods'><h3id='tymethod.as_'class='method'><codeid='as_.v'>fn <ahref='#tymethod.as_'class='fnname'>as_</a>(self) -> T</code></h3><divclass='docblock'><p>Convert a value to another, using the <code>as</code> operator.</p>
</script></section><sectionid="search"class="content hidden"></section><sectionclass="footer"></section><asideid="help"class="hidden"><div><h1class="hidden">Help</h1><divclass="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><divclass="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath="../";window.currentCrate="num_traits";</script><scriptsrc="../aliases.js"></script><scriptsrc="../main.js"></script><scriptdefersrc="../search-index.js"></script></body></html>
