<!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="Source to the Rust file `libcore/num/f64.rs`."> <meta name="keywords" content="rust, rustlang, rust-lang"> <title>f64.rs.html -- source</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="../../../main.css" id="themeStyle"> <script src="../../../storage.js"></script> <link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"> </head> <body class="rustdoc source"> <!--[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='../../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> </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"> </div> </form> </nav> <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span id="12"> 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id="283">283</span> <span id="284">284</span> <span id="285">285</span> <span id="286">286</span> <span id="287">287</span> <span id="288">288</span> <span id="289">289</span> <span id="290">290</span> <span id="291">291</span> <span id="292">292</span> <span id="293">293</span> </pre><pre class="rust "> <span class="comment">// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="doccomment">//! This module provides constants which are specific to the implementation</span> <span class="doccomment">//! of the `f64` floating point data type.</span> <span class="doccomment">//!</span> <span class="doccomment">//! Mathematically significant numbers are provided in the `consts` sub-module.</span> <span class="doccomment">//!</span> <span class="doccomment">//! *[See also the `f64` primitive type](../../std/primitive.f64.html).*</span> <span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">use</span> <span class="ident">intrinsics</span>; <span class="kw">use</span> <span class="ident">mem</span>; <span class="kw">use</span> <span class="ident">num</span>::<span class="ident">FpCategory</span> <span class="kw">as</span> <span class="ident">Fp</span>; <span class="kw">use</span> <span class="ident">num</span>::<span class="ident">Float</span>; <span class="doccomment">/// The radix or base of the internal representation of `f64`.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RADIX</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">2</span>; <span class="doccomment">/// Number of significant digits in base 2.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MANTISSA_DIGITS</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">53</span>; <span class="doccomment">/// Approximate number of significant digits in base 10.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">DIGITS</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">15</span>; <span class="doccomment">/// Difference between `1.0` and the next largest representable number.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">EPSILON</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">2.2204460492503131e-16_f64</span>; <span class="doccomment">/// Smallest finite `f64` value.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MIN</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="op">-</span><span class="number">1.7976931348623157e+308_f64</span>; <span class="doccomment">/// Smallest positive normal `f64` value.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MIN_POSITIVE</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">2.2250738585072014e-308_f64</span>; <span class="doccomment">/// Largest finite `f64` value.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MAX</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">1.7976931348623157e+308_f64</span>; <span class="doccomment">/// One greater than the minimum possible normal power of 2 exponent.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MIN_EXP</span>: <span class="ident">i32</span> <span class="op">=</span> <span class="op">-</span><span class="number">1021</span>; <span class="doccomment">/// Maximum possible power of 2 exponent.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MAX_EXP</span>: <span class="ident">i32</span> <span class="op">=</span> <span class="number">1024</span>; <span class="doccomment">/// Minimum possible normal power of 10 exponent.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MIN_10_EXP</span>: <span class="ident">i32</span> <span class="op">=</span> <span class="op">-</span><span class="number">307</span>; <span class="doccomment">/// Maximum possible power of 10 exponent.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MAX_10_EXP</span>: <span class="ident">i32</span> <span class="op">=</span> <span class="number">308</span>; <span class="doccomment">/// Not a Number (NaN).</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NAN</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.0_f64</span> <span class="op">/</span> <span class="number">0.0_f64</span>; <span class="doccomment">/// Infinity (∞).</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">INFINITY</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">1.0_f64</span> <span class="op">/</span> <span class="number">0.0_f64</span>; <span class="doccomment">/// Negative infinity (-∞).</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NEG_INFINITY</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="op">-</span><span class="number">1.0_f64</span> <span class="op">/</span> <span class="number">0.0_f64</span>; <span class="doccomment">/// Basic mathematical constants.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">consts</span> { <span class="comment">// FIXME: replace with mathematical constants from cmath.</span> <span class="doccomment">/// Archimedes' constant (π)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">PI</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">3.14159265358979323846264338327950288_f64</span>; <span class="doccomment">/// π/2</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_PI_2</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">1.57079632679489661923132169163975144_f64</span>; <span class="doccomment">/// π/3</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_PI_3</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">1.04719755119659774615421446109316763_f64</span>; <span class="doccomment">/// π/4</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_PI_4</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.785398163397448309615660845819875721_f64</span>; <span class="doccomment">/// π/6</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_PI_6</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.52359877559829887307710723054658381_f64</span>; <span class="doccomment">/// π/8</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_PI_8</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.39269908169872415480783042290993786_f64</span>; <span class="doccomment">/// 1/π</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_1_PI</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.318309886183790671537767526745028724_f64</span>; <span class="doccomment">/// 2/π</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_2_PI</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.636619772367581343075535053490057448_f64</span>; <span class="doccomment">/// 2/sqrt(π)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_2_SQRT_PI</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">1.12837916709551257389615890312154517_f64</span>; <span class="doccomment">/// sqrt(2)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SQRT_2</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">1.41421356237309504880168872420969808_f64</span>; <span class="doccomment">/// 1/sqrt(2)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">FRAC_1_SQRT_2</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.707106781186547524400844362104849039_f64</span>; <span class="doccomment">/// Euler's number (e)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">E</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">2.71828182845904523536028747135266250_f64</span>; <span class="doccomment">/// log<sub>2</sub>(e)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">LOG2_E</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">1.44269504088896340735992468100189214_f64</span>; <span class="doccomment">/// log<sub>10</sub>(e)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">LOG10_E</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.434294481903251827651128918916605082_f64</span>; <span class="doccomment">/// ln(2)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">LN_2</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.693147180559945309417232121458176568_f64</span>; <span class="doccomment">/// ln(10)</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">LN_10</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">2.30258509299404568401799145468436421_f64</span>; } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_float"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"stable interface is via `impl f{32,64}` in later crates"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32110"</span>)]</span> <span class="kw">impl</span> <span class="ident">Float</span> <span class="kw">for</span> <span class="ident">f64</span> { <span class="kw">type</span> <span class="ident">Bits</span> <span class="op">=</span> <span class="ident">u64</span>; <span class="doccomment">/// Returns `true` if the number is NaN.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">is_nan</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span> <span class="op">!=</span> <span class="self">self</span> } <span class="doccomment">/// Returns `true` if the number is infinite.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">is_infinite</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span> <span class="op">==</span> <span class="ident">INFINITY</span> <span class="op">||</span> <span class="self">self</span> <span class="op">==</span> <span class="ident">NEG_INFINITY</span> } <span class="doccomment">/// Returns `true` if the number is neither infinite or NaN.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">is_finite</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="op">!</span>(<span class="self">self</span>.<span class="ident">is_nan</span>() <span class="op">||</span> <span class="self">self</span>.<span class="ident">is_infinite</span>()) } <span class="doccomment">/// Returns `true` if the number is neither zero, infinite, subnormal or NaN.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">is_normal</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">classify</span>() <span class="op">==</span> <span class="ident">Fp</span>::<span class="ident">Normal</span> } <span class="doccomment">/// Returns the floating point category of the number. If only one property</span> <span class="doccomment">/// is going to be tested, it is generally faster to use the specific</span> <span class="doccomment">/// predicate instead.</span> <span class="kw">fn</span> <span class="ident">classify</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Fp</span> { <span class="kw">const</span> <span class="ident">EXP_MASK</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0x7ff0000000000000</span>; <span class="kw">const</span> <span class="ident">MAN_MASK</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0x000fffffffffffff</span>; <span class="kw">let</span> <span class="ident">bits</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_bits</span>(); <span class="kw">match</span> (<span class="ident">bits</span> <span class="op">&</span> <span class="ident">MAN_MASK</span>, <span class="ident">bits</span> <span class="op">&</span> <span class="ident">EXP_MASK</span>) { (<span class="number">0</span>, <span class="number">0</span>) <span class="op">=></span> <span class="ident">Fp</span>::<span class="ident">Zero</span>, (_, <span class="number">0</span>) <span class="op">=></span> <span class="ident">Fp</span>::<span class="ident">Subnormal</span>, (<span class="number">0</span>, <span class="ident">EXP_MASK</span>) <span class="op">=></span> <span class="ident">Fp</span>::<span class="ident">Infinite</span>, (_, <span class="ident">EXP_MASK</span>) <span class="op">=></span> <span class="ident">Fp</span>::<span class="ident">Nan</span>, _ <span class="op">=></span> <span class="ident">Fp</span>::<span class="ident">Normal</span>, } } <span class="doccomment">/// Computes the absolute value of `self`. Returns `Float::nan()` if the</span> <span class="doccomment">/// number is `Float::nan()`.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">abs</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">f64</span> { <span class="kw">unsafe</span> { <span class="ident">intrinsics</span>::<span class="ident">fabsf64</span>(<span class="self">self</span>) } } <span class="doccomment">/// Returns a number that represents the sign of `self`.</span> <span class="doccomment">///</span> <span class="doccomment">/// - `1.0` if the number is positive, `+0.0` or `Float::infinity()`</span> <span class="doccomment">/// - `-1.0` if the number is negative, `-0.0` or `Float::neg_infinity()`</span> <span class="doccomment">/// - `Float::nan()` if the number is `Float::nan()`</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">signum</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">f64</span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_nan</span>() { <span class="ident">NAN</span> } <span class="kw">else</span> { <span class="kw">unsafe</span> { <span class="ident">intrinsics</span>::<span class="ident">copysignf64</span>(<span class="number">1.0</span>, <span class="self">self</span>) } } } <span class="doccomment">/// Returns `true` if and only if `self` has a positive sign, including `+0.0`, `NaN`s with</span> <span class="doccomment">/// positive sign bit and positive infinity.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">is_sign_positive</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="op">!</span><span class="self">self</span>.<span class="ident">is_sign_negative</span>() } <span class="doccomment">/// Returns `true` if and only if `self` has a negative sign, including `-0.0`, `NaN`s with</span> <span class="doccomment">/// negative sign bit and negative infinity.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">is_sign_negative</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">to_bits</span>() <span class="op">&</span> <span class="number">0x8000_0000_0000_0000</span> <span class="op">!=</span> <span class="number">0</span> } <span class="doccomment">/// Returns the reciprocal (multiplicative inverse) of the number.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">recip</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">f64</span> { <span class="number">1.0</span> <span class="op">/</span> <span class="self">self</span> } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">powi</span>(<span class="self">self</span>, <span class="ident">n</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="ident">f64</span> { <span class="kw">unsafe</span> { <span class="ident">intrinsics</span>::<span class="ident">powif64</span>(<span class="self">self</span>, <span class="ident">n</span>) } } <span class="doccomment">/// Converts to degrees, assuming the number is in radians.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">to_degrees</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">f64</span> { <span class="comment">// The division here is correctly rounded with respect to the true</span> <span class="comment">// value of 180/π. (This differs from f32, where a constant must be</span> <span class="comment">// used to ensure a correctly rounded result.)</span> <span class="self">self</span> <span class="op">*</span> (<span class="number">180.0f64</span> <span class="op">/</span> <span class="ident">consts</span>::<span class="ident">PI</span>) } <span class="doccomment">/// Converts to radians, assuming the number is in degrees.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">to_radians</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">f64</span> { <span class="kw">let</span> <span class="ident">value</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="ident">consts</span>::<span class="ident">PI</span>; <span class="self">self</span> <span class="op">*</span> (<span class="ident">value</span> <span class="op">/</span> <span class="number">180.0</span>) } <span class="doccomment">/// Returns the maximum of the two numbers.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">max</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span> { <span class="comment">// IEEE754 says: maxNum(x, y) is the canonicalized number y if x < y, x if y < x, the</span> <span class="comment">// canonicalized number if one operand is a number and the other a quiet NaN. Otherwise it</span> <span class="comment">// is either x or y, canonicalized (this means results might differ among implementations).</span> <span class="comment">// When either x or y is a signalingNaN, then the result is according to 6.2.</span> <span class="comment">//</span> <span class="comment">// Since we do not support sNaN in Rust yet, we do not need to handle them.</span> <span class="comment">// FIXME(nagisa): due to https://bugs.llvm.org/show_bug.cgi?id=33303 we canonicalize by</span> <span class="comment">// multiplying by 1.0. Should switch to the `canonicalize` when it works.</span> (<span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_nan</span>() <span class="op">||</span> <span class="self">self</span> <span class="op"><</span> <span class="ident">other</span> { <span class="ident">other</span> } <span class="kw">else</span> { <span class="self">self</span> }) <span class="op">*</span> <span class="number">1.0</span> } <span class="doccomment">/// Returns the minimum of the two numbers.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">min</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">f64</span>) <span class="op">-></span> <span class="ident">f64</span> { <span class="comment">// IEEE754 says: minNum(x, y) is the canonicalized number x if x < y, y if y < x, the</span> <span class="comment">// canonicalized number if one operand is a number and the other a quiet NaN. Otherwise it</span> <span class="comment">// is either x or y, canonicalized (this means results might differ among implementations).</span> <span class="comment">// When either x or y is a signalingNaN, then the result is according to 6.2.</span> <span class="comment">//</span> <span class="comment">// Since we do not support sNaN in Rust yet, we do not need to handle them.</span> <span class="comment">// FIXME(nagisa): due to https://bugs.llvm.org/show_bug.cgi?id=33303 we canonicalize by</span> <span class="comment">// multiplying by 1.0. Should switch to the `canonicalize` when it works.</span> (<span class="kw">if</span> <span class="ident">other</span>.<span class="ident">is_nan</span>() <span class="op">||</span> <span class="self">self</span> <span class="op"><</span> <span class="ident">other</span> { <span class="self">self</span> } <span class="kw">else</span> { <span class="ident">other</span> }) <span class="op">*</span> <span class="number">1.0</span> } <span class="doccomment">/// Raw transmutation to `u64`.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">to_bits</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">u64</span> { <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="self">self</span>) } } <span class="doccomment">/// Raw transmutation from `u64`.</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">from_bits</span>(<span class="ident">v</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="comment">// It turns out the safety issues with sNaN were overblown! Hooray!</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">v</span>) } } } </pre> </section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="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> <div class="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> </div> </div> </aside> <script> window.rootPath = "../../../"; window.currentCrate = "core"; </script> <script src="../../../main.js"></script> <script defer src="../../../search-index.js"></script> </body> </html>