<!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 `src/libcore/num/f32.rs`."> <meta name="keywords" content="rust, rustlang, rust-lang"> <title>f32.rs.html -- source</title> <link rel="stylesheet" type="text/css" href="../../../normalize.css"> <link rel="stylesheet" type="text/css" href="../../../rustdoc.css"> <link rel="stylesheet" type="text/css" href="../../../main.css"> <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"> <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> <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"> 12</span> <span id="13"> 13</span> <span id="14"> 14</span> <span id="15"> 15</span> <span id="16"> 16</span> <span id="17"> 17</span> <span id="18"> 18</span> <span id="19"> 19</span> <span id="20"> 20</span> <span id="21"> 21</span> <span id="22"> 22</span> <span id="23"> 23</span> <span id="24"> 24</span> <span id="25"> 25</span> <span id="26"> 26</span> <span id="27"> 27</span> <span id="28"> 28</span> <span id="29"> 29</span> <span 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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">//! Operations and constants for 32-bits floats (`f32` type)</span> <span class="comment">// FIXME: MIN_VALUE and MAX_VALUE literals are parsed as -inf and inf #14353</span> <span class="attribute">#<span class="op">!</span>[<span class="ident">allow</span>(<span class="ident">overflowing_literals</span>)]</span> <span class="attribute">#<span class="op">!</span>[<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">Float</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="doccomment">/// The radix or base of the internal representation of `f32`.</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">24</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">6</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">f32</span> <span class="op">=</span> <span class="number">1.19209290e-07_f32</span>; <span class="doccomment">/// Smallest finite `f32` 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">f32</span> <span class="op">=</span> <span class="op">-</span><span class="number">3.40282347e+38_f32</span>; <span class="doccomment">/// Smallest positive normal `f32` 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">f32</span> <span class="op">=</span> <span class="number">1.17549435e-38_f32</span>; <span class="doccomment">/// Largest finite `f32` 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">f32</span> <span class="op">=</span> <span class="number">3.40282347e+38_f32</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">125</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">128</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">37</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">38</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">f32</span> <span class="op">=</span> <span class="number">0.0_f32</span> <span class="op">/</span> <span class="number">0.0_f32</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">f32</span> <span class="op">=</span> <span class="number">1.0_f32</span> <span class="op">/</span> <span class="number">0.0_f32</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">f32</span> <span class="op">=</span> <span class="op">-</span><span class="number">1.0_f32</span> <span class="op">/</span> <span class="number">0.0_f32</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">f32</span> <span class="op">=</span> <span class="number">3.14159265358979323846264338327950288_f32</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">f32</span> <span class="op">=</span> <span class="number">1.57079632679489661923132169163975144_f32</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">f32</span> <span class="op">=</span> <span class="number">1.04719755119659774615421446109316763_f32</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">f32</span> <span class="op">=</span> <span class="number">0.785398163397448309615660845819875721_f32</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">f32</span> <span class="op">=</span> <span class="number">0.52359877559829887307710723054658381_f32</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">f32</span> <span class="op">=</span> <span class="number">0.39269908169872415480783042290993786_f32</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">f32</span> <span class="op">=</span> <span class="number">0.318309886183790671537767526745028724_f32</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">f32</span> <span class="op">=</span> <span class="number">0.636619772367581343075535053490057448_f32</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">f32</span> <span class="op">=</span> <span class="number">1.12837916709551257389615890312154517_f32</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">f32</span> <span class="op">=</span> <span class="number">1.41421356237309504880168872420969808_f32</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">f32</span> <span class="op">=</span> <span class="number">0.707106781186547524400844362104849039_f32</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">f32</span> <span class="op">=</span> <span class="number">2.71828182845904523536028747135266250_f32</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">f32</span> <span class="op">=</span> <span class="number">1.44269504088896340735992468100189214_f32</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">f32</span> <span class="op">=</span> <span class="number">0.434294481903251827651128918916605082_f32</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">f32</span> <span class="op">=</span> <span class="number">0.693147180559945309417232121458176568_f32</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">f32</span> <span class="op">=</span> <span class="number">2.30258509299404568401799145468436421_f32</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">f32</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">u32</span> <span class="op">=</span> <span class="number">0x7f800000</span>; <span class="kw">const</span> <span class="ident">MAN_MASK</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0x007fffff</span>; <span class="kw">let</span> <span class="ident">bits</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="self">self</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">f32</span> { <span class="kw">unsafe</span> { <span class="ident">intrinsics</span>::<span class="ident">fabsf32</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">f32</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">copysignf32</span>(<span class="number">1.0</span>, <span class="self">self</span>) } } } <span class="doccomment">/// Returns `true` if `self` is positive, including `+0.0` and</span> <span class="doccomment">/// `Float::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="self">self</span> <span class="op">></span> <span class="number">0.0</span> <span class="op">||</span> (<span class="number">1.0</span> <span class="op">/</span> <span class="self">self</span>) <span class="op">==</span> <span class="ident">INFINITY</span> } <span class="doccomment">/// Returns `true` if `self` is negative, including `-0.0` and</span> <span class="doccomment">/// `Float::neg_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="op"><</span> <span class="number">0.0</span> <span class="op">||</span> (<span class="number">1.0</span> <span class="op">/</span> <span class="self">self</span>) <span class="op">==</span> <span class="ident">NEG_INFINITY</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">f32</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">f32</span> { <span class="kw">unsafe</span> { <span class="ident">intrinsics</span>::<span class="ident">powif32</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">f32</span> { <span class="self">self</span> <span class="op">*</span> (<span class="number">180.0f32</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">f32</span> { <span class="kw">let</span> <span class="ident">value</span>: <span class="ident">f32</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">180.0f32</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>?</dt> <dd>Show this help dialog</dd> <dt>S</dt> <dd>Focus the search field</dd> <dt>⇤</dt> <dd>Move up in search results</dd> <dt>⇥</dt> <dd>Move down in search results</dd> <dt>⏎</dt> <dd>Go to active search result</dd> <dt>+</dt> <dd>Collapse/expand 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 = "../../../"; 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