<!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 `One` trait in crate `cgmath`."><metaname="keywords"content="rust, rustlang, rust-lang, One"><title>cgmath::One - 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='../cgmath/index.html'><divclass='logo-container'><imgsrc='../rust-logo.png'alt='logo'></div></a><pclass='location'>Trait One</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#required-methods">Required Methods</a><divclass="sidebar-links"><ahref="#tymethod.one">one</a></div><aclass="sidebar-title"href="#provided-methods">Provided Methods</a><divclass="sidebar-links"><ahref="#method.is_one">is_one</a><ahref="#method.set_one">set_one</a></div><aclass="sidebar-title"href="#foreign-impls">Implementations on Foreign Types</a><divclass="sidebar-links"><ahref="#impl-One-for-Wrapping%3CT%3E">Wrapping<T></a><ahref="#impl-One-for-f32">f32</a><ahref="#impl-One-for-f64">f64</a><ahref="#impl-One-for-i128">i128</a><ahref="#impl-One-for-i16">i16</a><ahref="#impl-One-for-i32">i32</a><ahref="#impl-One-for-i64">i64</a><ahref="#impl-One-for-i8">i8</a><ahref="#impl-One-for-isize">isize</a><ahref="#impl-One-for-u128">u128</a><ahref="#impl-One-for-u16">u16</a><ahref="#impl-One-for-u32">u32</a><ahref="#impl-One-for-u64">u64</a><ahref="#impl-One-for-u8">u8</a><ahref="#impl-One-for-usize">usize</a></div><aclass="sidebar-title"href="#implementors">Implementors</a></div><pclass='location'><ahref='index.html'>cgmath</a></p><script>window.sidebarCurrent={name:'One',ty:'trait',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../settings.html"><imgsrc="../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../src/num_traits/identities.rs.html#91-119'title='goto source code'>[src]</a></span><spanclass='in-band'>Trait <ahref='index.html'>cgmath</a>::<wbr><aclass="trait"href=''>One</a></span></h1><divclass="docblock type-decl hidden-by-usual-hider"><preclass='rust trait'>pub trait One: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.Mul.html"title="trait core::ops::arith::Mul">Mul</a><Self, Output = Self> {
<pre><codeclass="language-{.text}">a * 1 = a ∀ a ∈ Self
1 * a = a ∀ a ∈ Self
</code></pre>
</div>
<h2id='required-methods'class='small-section-header'>Required methods<ahref='#required-methods'class='anchor'></a></h2><divclass='methods'><h3id='tymethod.one'class='method'><codeid='one.v'>fn <ahref='#tymethod.one'class='fnname'>one</a>() -> Self</code></h3><divclass='docblock'><p>Returns the multiplicative identity element of <code>Self</code>, <code>1</code>.</p>
<h2id='provided-methods'class='small-section-header'>Provided methods<ahref='#provided-methods'class='anchor'></a></h2><divclass='methods'><h3id='method.set_one'class='method'><codeid='set_one.v'>fn <ahref='#method.set_one'class='fnname'>set_one</a>(&mut self)</code></h3><divclass='docblock'><p>Sets <code>self</code> to the multiplicative identity element of <code>Self</code>, <code>1</code>.</p>
</div><h3id='method.is_one'class='method'><codeid='is_one.v'>fn <ahref='#method.is_one'class='fnname'>is_one</a>(&self) -><aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><spanclass="where fmt-newline">where<br> Self: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html"title="trait core::cmp::PartialEq">PartialEq</a><Self>, </span></code></h3><divclass='docblock'><p>Returns <code>true</code> if <code>self</code> is equal to the multiplicative identity.</p>
<p>For performance reasons, it's best to implement this manually.
After a semver bump, this method will be required, and the
<code>where Self: PartialEq</code> bound will be removed.</p>
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