<!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/fmt/float.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>float.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="../../../light.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"><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"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2017 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="kw">use</span> <span class="ident">fmt</span>::{<span class="ident">Formatter</span>, <span class="prelude-ty">Result</span>, <span class="ident">LowerExp</span>, <span class="ident">UpperExp</span>, <span class="ident">Display</span>, <span class="ident">Debug</span>};
<span class="kw">use</span> <span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">num</span>::<span class="ident">flt2dec</span>;
<span class="comment">// Don't inline this so callers don't use the stack space this function</span>
<span class="comment">// requires unless they have to.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="kw">fn</span> <span class="ident">float_to_decimal_common_exact</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>, <span class="ident">num</span>: <span class="kw-2">&</span><span class="ident">T</span>,
<span class="ident">sign</span>: <span class="ident">flt2dec</span>::<span class="ident">Sign</span>, <span class="ident">precision</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">flt2dec</span>::<span class="ident">DecodableFloat</span>
{
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span>: [<span class="ident">u8</span>; <span class="number">1024</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>(); <span class="comment">// enough for f32 and f64</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span>: [<span class="ident">flt2dec</span>::<span class="ident">Part</span>; <span class="number">4</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>();
<span class="kw">let</span> <span class="ident">formatted</span> <span class="op">=</span> <span class="ident">flt2dec</span>::<span class="ident">to_exact_fixed_str</span>(<span class="ident">flt2dec</span>::<span class="ident">strategy</span>::<span class="ident">grisu</span>::<span class="ident">format_exact</span>,
<span class="kw-2">*</span><span class="ident">num</span>, <span class="ident">sign</span>, <span class="ident">precision</span>,
<span class="bool-val">false</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">parts</span>);
<span class="ident">fmt</span>.<span class="ident">pad_formatted_parts</span>(<span class="kw-2">&</span><span class="ident">formatted</span>)
}
}
<span class="comment">// Don't inline this so callers that call both this and the above won't wind</span>
<span class="comment">// up using the combined stack space of both functions in some cases.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="kw">fn</span> <span class="ident">float_to_decimal_common_shortest</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>, <span class="ident">num</span>: <span class="kw-2">&</span><span class="ident">T</span>,
<span class="ident">sign</span>: <span class="ident">flt2dec</span>::<span class="ident">Sign</span>, <span class="ident">precision</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">flt2dec</span>::<span class="ident">DecodableFloat</span>
{
<span class="kw">unsafe</span> {
<span class="comment">// enough for f32 and f64</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span>: [<span class="ident">u8</span>; <span class="ident">flt2dec</span>::<span class="ident">MAX_SIG_DIGITS</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span>: [<span class="ident">flt2dec</span>::<span class="ident">Part</span>; <span class="number">4</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>();
<span class="kw">let</span> <span class="ident">formatted</span> <span class="op">=</span> <span class="ident">flt2dec</span>::<span class="ident">to_shortest_str</span>(<span class="ident">flt2dec</span>::<span class="ident">strategy</span>::<span class="ident">grisu</span>::<span class="ident">format_shortest</span>, <span class="kw-2">*</span><span class="ident">num</span>,
<span class="ident">sign</span>, <span class="ident">precision</span>, <span class="bool-val">false</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">parts</span>);
<span class="ident">fmt</span>.<span class="ident">pad_formatted_parts</span>(<span class="kw-2">&</span><span class="ident">formatted</span>)
}
}
<span class="comment">// Common code of floating point Debug and Display.</span>
<span class="kw">fn</span> <span class="ident">float_to_decimal_common</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>, <span class="ident">num</span>: <span class="kw-2">&</span><span class="ident">T</span>,
<span class="ident">negative_zero</span>: <span class="ident">bool</span>, <span class="ident">min_precision</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">flt2dec</span>::<span class="ident">DecodableFloat</span>
{
<span class="kw">let</span> <span class="ident">force_sign</span> <span class="op">=</span> <span class="ident">fmt</span>.<span class="ident">sign_plus</span>();
<span class="kw">let</span> <span class="ident">sign</span> <span class="op">=</span> <span class="kw">match</span> (<span class="ident">force_sign</span>, <span class="ident">negative_zero</span>) {
(<span class="bool-val">false</span>, <span class="bool-val">false</span>) <span class="op">=></span> <span class="ident">flt2dec</span>::<span class="ident">Sign</span>::<span class="ident">Minus</span>,
(<span class="bool-val">false</span>, <span class="bool-val">true</span>) <span class="op">=></span> <span class="ident">flt2dec</span>::<span class="ident">Sign</span>::<span class="ident">MinusRaw</span>,
(<span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="op">=></span> <span class="ident">flt2dec</span>::<span class="ident">Sign</span>::<span class="ident">MinusPlus</span>,
(<span class="bool-val">true</span>, <span class="bool-val">true</span>) <span class="op">=></span> <span class="ident">flt2dec</span>::<span class="ident">Sign</span>::<span class="ident">MinusPlusRaw</span>,
};
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">precision</span>) <span class="op">=</span> <span class="ident">fmt</span>.<span class="ident">precision</span> {
<span class="ident">float_to_decimal_common_exact</span>(<span class="ident">fmt</span>, <span class="ident">num</span>, <span class="ident">sign</span>, <span class="ident">precision</span>)
} <span class="kw">else</span> {
<span class="ident">float_to_decimal_common_shortest</span>(<span class="ident">fmt</span>, <span class="ident">num</span>, <span class="ident">sign</span>, <span class="ident">min_precision</span>)
}
}
<span class="comment">// Don't inline this so callers don't use the stack space this function</span>
<span class="comment">// requires unless they have to.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="kw">fn</span> <span class="ident">float_to_exponential_common_exact</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>, <span class="ident">num</span>: <span class="kw-2">&</span><span class="ident">T</span>,
<span class="ident">sign</span>: <span class="ident">flt2dec</span>::<span class="ident">Sign</span>, <span class="ident">precision</span>: <span class="ident">usize</span>,
<span class="ident">upper</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">flt2dec</span>::<span class="ident">DecodableFloat</span>
{
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span>: [<span class="ident">u8</span>; <span class="number">1024</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>(); <span class="comment">// enough for f32 and f64</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span>: [<span class="ident">flt2dec</span>::<span class="ident">Part</span>; <span class="number">6</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>();
<span class="kw">let</span> <span class="ident">formatted</span> <span class="op">=</span> <span class="ident">flt2dec</span>::<span class="ident">to_exact_exp_str</span>(<span class="ident">flt2dec</span>::<span class="ident">strategy</span>::<span class="ident">grisu</span>::<span class="ident">format_exact</span>,
<span class="kw-2">*</span><span class="ident">num</span>, <span class="ident">sign</span>, <span class="ident">precision</span>,
<span class="ident">upper</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">parts</span>);
<span class="ident">fmt</span>.<span class="ident">pad_formatted_parts</span>(<span class="kw-2">&</span><span class="ident">formatted</span>)
}
}
<span class="comment">// Don't inline this so callers that call both this and the above won't wind</span>
<span class="comment">// up using the combined stack space of both functions in some cases.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="kw">fn</span> <span class="ident">float_to_exponential_common_shortest</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>,
<span class="ident">num</span>: <span class="kw-2">&</span><span class="ident">T</span>, <span class="ident">sign</span>: <span class="ident">flt2dec</span>::<span class="ident">Sign</span>,
<span class="ident">upper</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">flt2dec</span>::<span class="ident">DecodableFloat</span>
{
<span class="kw">unsafe</span> {
<span class="comment">// enough for f32 and f64</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span>: [<span class="ident">u8</span>; <span class="ident">flt2dec</span>::<span class="ident">MAX_SIG_DIGITS</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parts</span>: [<span class="ident">flt2dec</span>::<span class="ident">Part</span>; <span class="number">6</span>] <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>();
<span class="kw">let</span> <span class="ident">formatted</span> <span class="op">=</span> <span class="ident">flt2dec</span>::<span class="ident">to_shortest_exp_str</span>(<span class="ident">flt2dec</span>::<span class="ident">strategy</span>::<span class="ident">grisu</span>::<span class="ident">format_shortest</span>,
<span class="kw-2">*</span><span class="ident">num</span>, <span class="ident">sign</span>, (<span class="number">0</span>, <span class="number">0</span>), <span class="ident">upper</span>,
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">parts</span>);
<span class="ident">fmt</span>.<span class="ident">pad_formatted_parts</span>(<span class="kw-2">&</span><span class="ident">formatted</span>)
}
}
<span class="comment">// Common code of floating point LowerExp and UpperExp.</span>
<span class="kw">fn</span> <span class="ident">float_to_exponential_common</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>, <span class="ident">num</span>: <span class="kw-2">&</span><span class="ident">T</span>, <span class="ident">upper</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">flt2dec</span>::<span class="ident">DecodableFloat</span>
{
<span class="kw">let</span> <span class="ident">force_sign</span> <span class="op">=</span> <span class="ident">fmt</span>.<span class="ident">sign_plus</span>();
<span class="kw">let</span> <span class="ident">sign</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">force_sign</span> {
<span class="bool-val">false</span> <span class="op">=></span> <span class="ident">flt2dec</span>::<span class="ident">Sign</span>::<span class="ident">Minus</span>,
<span class="bool-val">true</span> <span class="op">=></span> <span class="ident">flt2dec</span>::<span class="ident">Sign</span>::<span class="ident">MinusPlus</span>,
};
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">precision</span>) <span class="op">=</span> <span class="ident">fmt</span>.<span class="ident">precision</span> {
<span class="comment">// 1 integral digit + `precision` fractional digits = `precision + 1` total digits</span>
<span class="ident">float_to_exponential_common_exact</span>(<span class="ident">fmt</span>, <span class="ident">num</span>, <span class="ident">sign</span>, <span class="ident">precision</span> <span class="op">+</span> <span class="number">1</span>, <span class="ident">upper</span>)
} <span class="kw">else</span> {
<span class="ident">float_to_exponential_common_shortest</span>(<span class="ident">fmt</span>, <span class="ident">num</span>, <span class="ident">sign</span>, <span class="ident">upper</span>)
}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">floating</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span>:<span class="ident">ident</span>) <span class="op">=></span> (
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="ident">float_to_decimal_common</span>(<span class="ident">fmt</span>, <span class="self">self</span>, <span class="bool-val">true</span>, <span class="number">1</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">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="ident">float_to_decimal_common</span>(<span class="ident">fmt</span>, <span class="self">self</span>, <span class="bool-val">false</span>, <span class="number">0</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">LowerExp</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="ident">float_to_exponential_common</span>(<span class="ident">fmt</span>, <span class="self">self</span>, <span class="bool-val">false</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">impl</span> <span class="ident">UpperExp</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ty</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="ident">float_to_exponential_common</span>(<span class="ident">fmt</span>, <span class="self">self</span>, <span class="bool-val">true</span>)
}
}
)
}
<span class="macro">floating</span><span class="macro">!</span> { <span class="ident">f32</span> }
<span class="macro">floating</span><span class="macro">!</span> { <span class="ident">f64</span> }
</pre>
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