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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 `NumCast` trait in crate `num`."><meta name="keywords" content="rust, rustlang, rust-lang, NumCast"><title>num::cast::NumCast - 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><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.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">☰</div><a href='../../num/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a><p class='location'>Trait NumCast</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.from">from</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-NumCast-for-Wrapping%3CT%3E">Wrapping<T></a><a href="#impl-NumCast-for-f32">f32</a><a href="#impl-NumCast-for-f64">f64</a><a href="#impl-NumCast-for-i128">i128</a><a href="#impl-NumCast-for-i16">i16</a><a href="#impl-NumCast-for-i32">i32</a><a href="#impl-NumCast-for-i64">i64</a><a href="#impl-NumCast-for-i8">i8</a><a href="#impl-NumCast-for-isize">isize</a><a href="#impl-NumCast-for-u128">u128</a><a href="#impl-NumCast-for-u16">u16</a><a href="#impl-NumCast-for-u32">u32</a><a href="#impl-NumCast-for-u64">u64</a><a href="#impl-NumCast-for-u8">u8</a><a href="#impl-NumCast-for-usize">usize</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>num</a>::<wbr><a href='index.html'>cast</a></p><script>window.sidebarCurrent = {name: 'NumCast', 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="../../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"><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="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><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/num_traits/cast.rs.html#640-644' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>num</a>::<wbr><a href='index.html'>cast</a>::<wbr><a class="trait" href=''>NumCast</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait NumCast: <a class="trait" href="../../num/traits/cast/trait.ToPrimitive.html" title="trait num::traits::cast::ToPrimitive">ToPrimitive</a> {
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fn <a href='#tymethod.from' class='fnname'>from</a><T>(n: T) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self><br> <span class="where">where<br> T: <a class="trait" href="../../num/traits/cast/trait.ToPrimitive.html" title="trait num::traits::cast::ToPrimitive">ToPrimitive</a></span>;
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}</pre></div><div class='docblock'><p>An interface for casting between machine scalars.</p>
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</div>
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<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.from' class='method'><code id='from.v'>fn <a href='#tymethod.from' class='fnname'>from</a><T>(n: T) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../num/traits/cast/trait.ToPrimitive.html" title="trait num::traits::cast::ToPrimitive">ToPrimitive</a>, </span></code></h3><div class='docblock'><p>Creates a number from another value that can be converted into
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a primitive via the <code>ToPrimitive</code> trait.</p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='foreign-impls' class='small-section-header'>Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a></h2><h3 id='impl-NumCast-for-i128' class='impl'><code class='in-band'>impl <a class="trait" href="../../num/traits/cast/trait.NumCast.html" title="trait num::traits::cast::NumCast">NumCast</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i128.html">i128</a></code><a href='#impl-NumCast-for-i128' class='anchor'></a><a class='srclink' href='../../src/num_traits/cast.rs.html#648-656' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from' class="method hidden"><code id='from.v-1'>fn <a href='#method.from' class='fnname'>from</a><N>(n: N) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i128.html">i128</a>> <span class="where fmt-newline">where<br> N: <a class="trait" href="../../num/traits/cast/trait.ToPrimitive.html" title="trait num::traits::cast::ToPrimitive">ToPrimitive</a>, </span></code><a class='srclink' href='../../src/num_traits/cast.rs.html#651-655' title='goto source code'>[src]</a></h4></div><h3 id='impl-NumCast-for-u16' class='impl'><code class='in-band'>impl <a class="trait" href="../../num/traits/cast/trait.NumCast.html" title="trait num::traits::cast::NumCast">NumCast</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a></code><a href='#impl-NumCast-for-u16' class='anchor'></a><a class='srclink' href='../../src/num_traits/cast.rs.html#648-656' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from-1' class="method hidden"><code id='from.v-2'>fn <a href='#method.from' class='fnname'>from</a><N>(n: N) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>> <span class="where fmt-newline">where<br> N: <a class="trait" href="../../num/traits/cast/trait.ToPrimitive.html" title="trait num::traits::cast::ToPrimitive">ToPrimitive</a>, </span></code><a class='srclink' href='../../src/num_traits/cast.rs.html#651-655' title='goto source code'>[src]</a></h4></div><h3 id='impl-NumCast-for-i16' class='impl'><code class='in-band'>impl <a class="trait" href="../../num/traits/cast/trait.NumCast.html" title="trait num::traits::cast::NumCast">NumCast</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a></code><a href='#impl-NumCast-for-i16' class='anchor'></a><a class='srclink' href='../../src/num_traits/cast.rs.html#648-656' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from-2' class="method hidden"><code id='from.v-3'>fn <a href='#method.from' class='fnname'>from</a><N>(n: N) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>> <span class="where fmt-newline">where<br> N: <a class="trait" href="../../num/traits/cast/trait.ToPrimitive.html" title="trait num::traits::cast::ToPrimitive">ToPrimitive</a>, </span></code><a class='srclink' href='../../src/num_traits/cast.rs.html#651-655' title='goto source code'>[src]</a></h4></div><h3 id='impl-NumCast-for-usize' class='impl'><code class='in-band'>impl <a class="trait" href="../../num/traits/cast/trait.NumCast.html" title="trait num::traits::cast::NumCast">NumCast</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code><a href='#impl-NumCast-for-usize' class='anchor'></a><a class='srclink' href='../../src/num_traits/cast.rs.html#648-656' title='goto sou
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