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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 `Num` trait in crate `num_traits`."><meta name="keywords" content="rust, rustlang, rust-lang, Num"><title>num_traits::Num - 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_traits/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Trait Num</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.FromStrRadixErr">FromStrRadixErr</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.from_str_radix">from_str_radix</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-Num-for-Wrapping%3CT%3E">Wrapping<T></a><a href="#impl-Num-for-f32">f32</a><a href="#impl-Num-for-f64">f64</a><a href="#impl-Num-for-i128">i128</a><a href="#impl-Num-for-i16">i16</a><a href="#impl-Num-for-i32">i32</a><a href="#impl-Num-for-i64">i64</a><a href="#impl-Num-for-i8">i8</a><a href="#impl-Num-for-isize">isize</a><a href="#impl-Num-for-u128">u128</a><a href="#impl-Num-for-u16">u16</a><a href="#impl-Num-for-u32">u32</a><a href="#impl-Num-for-u64">u64</a><a href="#impl-Num-for-u8">u8</a><a href="#impl-Num-for-usize">usize</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>num_traits</a></p><script>window.sidebarCurrent = {name: 'Num', 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/lib.rs.html#62-79' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='index.html'>num_traits</a>::<wbr><a class="trait" href=''>Num</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait Num: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> + <a class="trait" href="../num_traits/identities/trait.Zero.html" title="trait num_traits::identities::Zero">Zero</a> + <a class="trait" href="../num_trai
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type <a href='#associatedtype.FromStrRadixErr' class="type">FromStrRadixErr</a>;
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fn <a href='#tymethod.from_str_radix' class='fnname'>from_str_radix</a>(<br> str: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, <br> radix: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, Self::<a class="type" href="../num_traits/trait.Num.html#associatedtype.FromStrRadixErr" title="type num_traits::Num::FromStrRadixErr">FromStrRadixErr</a>>;
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}</pre></div><div class='docblock'><p>The base trait for numeric types, covering <code>0</code> and <code>1</code> values,
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comparisons, basic numeric operations, and string conversion.</p>
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</div>
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<h2 id='associated-types' class='small-section-header'>Associated Types<a href='#associated-types' class='anchor'></a></h2><div class='methods'><h3 id='associatedtype.FromStrRadixErr' class='method'><code id='FromStrRadixErr.t'>type <a href='#associatedtype.FromStrRadixErr' class="type">FromStrRadixErr</a></code></h3></div><span class='loading-content'>Loading content...</span>
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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_str_radix' class='method'><code id='from_str_radix.v'>fn <a href='#tymethod.from_str_radix' class='fnname'>from_str_radix</a>(str: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, radix: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, Self::<a class="type" href="../num_traits/trait.Num.html#associatedtype.FromStrRadixErr" title="type num_traits::Num::FromStrRadixErr">FromStrRadixErr</a>></code></h3><div class='docblock'><p>Convert from a string and radix <= 36.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">num_traits</span>::<span class="ident">Num</span>;
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<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="op"><</span><span class="ident">i32</span> <span class="kw">as</span> <span class="ident">Num</span><span class="op">></span>::<span class="ident">from_str_radix</span>(<span class="string">"27"</span>, <span class="number">10</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result</span>, <span class="prelude-val">Ok</span>(<span class="number">27</span>));
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<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="op"><</span><span class="ident">i32</span> <span class="kw">as</span> <span class="ident">Num</span><span class="op">></span>::<span class="ident">from_str_radix</span>(<span class="string">"foo"</span>, <span class="number">10</span>);
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span>.<span class="ident">is_err</span>());</pre></div>
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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-Num-for-usize' class='impl'><code class='in-band'>impl <a class="trait" href="../num_traits/trait.Num.html" title="trait num_traits::Num">Num</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code><a href='#impl-Num-for-usize' class='anchor'></a><a class='srclink' href='../src/num_traits/lib.rs.html#144-152' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.FromStrRadixErr-1' class="type"><code id='FromStrRadixErr.t-1'>type <a href='#associatedtype.FromStrRadixErr' class="type">FromStrRadixErr</a> = <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a></code></h4><h4 id='method.from_str_radix' class="method hidden"><code id='from_str_radix.v-1'>fn <a href='#method.from_str_radix' class='fnname'>from_str_radix</a>(s: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, radix: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>></code><a class='srclink' href='../src/num_traits/lib.rs.html#147-151' title='goto source code'>[src]</a></h4></div><h3 id='impl-Num-for-u8' class='impl'><code class='in-band'>impl <a class="trait" href="../num_traits/trait.Num.html" title="trait num_traits::Num">Num</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a></code><a href='#impl-Num-for-u8' class='anchor'></a><a class='srclink' href='../src/num_traits/lib.rs.html#144-152' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.FromStrRadixErr-2' class="type"><code id='FromStrRadixErr.t-2'>type <a href='#associatedtype.FromStrRadixErr' class="type">FromStrRadixErr</a> = <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a></code></h4><h4 id='method.from_str_radix-1' class="method hidden"><code id='from_str_radix.v-2'>fn <a href='#method.from_str_radix' class='fnname'>from_str_radix</a>(s: &<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, radix: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>></code><a class='srclink' href='../src/num_traits/lib.rs.html#147-151' title='goto source code'>[src]</a></h4></div><h3 id='impl-Num-for-u16' class='impl'><code class='in-band'>impl <a class="trait" href="../num_traits/trait.Num.html" title="trait num_traits::Num">Num</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a></code><a href='#impl-Num-for-u16' class='anchor'></a><a class='srclink' href='../src/num_traits/lib.rs.html#144-152' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.FromStrRadixErr-3' class="type"><code id='FromStrRadixErr.t-3'>type <a href='#associatedtype.FromStrRadixErr' class="type">FromStrRadixErr</a> = <a class="struct" href="https://doc.rust-lang.org/nightly/core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a></code></h4><h4 id='method.from_str_radix-2' class="method hidden"><code id='from_str_radix.v-3'>fn <a href='#metho
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