<!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/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.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 2013-2015 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">//! Utilities for formatting and printing strings.</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">cell</span>::{<span class="ident">UnsafeCell</span>, <span class="ident">Cell</span>, <span class="ident">RefCell</span>, <span class="ident">Ref</span>, <span class="ident">RefMut</span>};
<span class="kw">use</span> <span class="ident">marker</span>::<span class="ident">PhantomData</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="kw">use</span> <span class="ident">ops</span>::<span class="ident">Deref</span>;
<span class="kw">use</span> <span class="ident">result</span>;
<span class="kw">use</span> <span class="ident">slice</span>;
<span class="kw">use</span> <span class="ident">str</span>;
<span class="kw">mod</span> <span class="ident">float</span>;
<span class="kw">mod</span> <span class="ident">num</span>;
<span class="kw">mod</span> <span class="ident">builders</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags_align"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.28.0"</span>)]</span>
<span class="doccomment">/// Possible alignments returned by `Formatter::align`</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Alignment</span> {
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags_align"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.28.0"</span>)]</span>
<span class="doccomment">/// Indication that contents should be left-aligned.</span>
<span class="ident">Left</span>,
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags_align"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.28.0"</span>)]</span>
<span class="doccomment">/// Indication that contents should be right-aligned.</span>
<span class="ident">Right</span>,
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags_align"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.28.0"</span>)]</span>
<span class="doccomment">/// Indication that contents should be center-aligned.</span>
<span class="ident">Center</span>,
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">builders</span>::{<span class="ident">DebugStruct</span>, <span class="ident">DebugTuple</span>, <span class="ident">DebugSet</span>, <span class="ident">DebugList</span>, <span class="ident">DebugMap</span>};
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">rt</span> {
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">v1</span>;
}
<span class="doccomment">/// The type returned by formatter methods.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[derive(Debug)]</span>
<span class="doccomment">/// struct Triangle {</span>
<span class="doccomment">/// a: f32,</span>
<span class="doccomment">/// b: f32,</span>
<span class="doccomment">/// c: f32</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Triangle {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// write!(f, "({}, {}, {})", self.a, self.b, self.c)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pythagorean_triple = Triangle { a: 3.0, b: 4.0, c: 5.0 };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("{}", pythagorean_triple);</span>
<span class="doccomment">/// ```</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">type</span> <span class="prelude-ty">Result</span> <span class="op">=</span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span>;
<span class="doccomment">/// The error type which is returned from formatting a message into a stream.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This type does not support transmission of an error other than that an error</span>
<span class="doccomment">/// occurred. Any extra information must be arranged to be transmitted through</span>
<span class="doccomment">/// some other means.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An important thing to remember is that the type `fmt::Error` should not be</span>
<span class="doccomment">/// confused with [`std::io::Error`] or [`std::error::Error`], which you may also</span>
<span class="doccomment">/// have in scope.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`std::io::Error`]: ../../std/io/struct.Error.html</span>
<span class="doccomment">/// [`std::error::Error`]: ../../std/error/trait.Error.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::fmt::{self, write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut output = String::new();</span>
<span class="doccomment">/// match write(&mut output, format_args!("Hello {}!", "world")) {</span>
<span class="doccomment">/// Err(fmt::Error) => panic!("An error occurred"),</span>
<span class="doccomment">/// _ => (),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</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="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Default</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">Ord</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Error</span>;
<span class="doccomment">/// A collection of methods that are required to format a message into a stream.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This trait is the type which this modules requires when formatting</span>
<span class="doccomment">/// information. This is similar to the standard library's [`io::Write`] trait,</span>
<span class="doccomment">/// but it is only intended for use in libcore.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This trait should generally not be implemented by consumers of the standard</span>
<span class="doccomment">/// library. The [`write!`] macro accepts an instance of [`io::Write`], and the</span>
<span class="doccomment">/// [`io::Write`] trait is favored over implementing this trait.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`write!`]: ../../std/macro.write.html</span>
<span class="doccomment">/// [`io::Write`]: ../../std/io/trait.Write.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">pub</span> <span class="kw">trait</span> <span class="ident">Write</span> {
<span class="doccomment">/// Writes a slice of bytes into this writer, returning whether the write</span>
<span class="doccomment">/// succeeded.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method can only succeed if the entire byte slice was successfully</span>
<span class="doccomment">/// written, and this method will not return until all data has been</span>
<span class="doccomment">/// written or an error occurs.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will return an instance of [`Error`] on error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Error`]: struct.Error.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt::{Error, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn writer<W: Write>(f: &mut W, s: &str) -> Result<(), Error> {</span>
<span class="doccomment">/// f.write_str(s)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buf = String::new();</span>
<span class="doccomment">/// writer(&mut buf, "hola").unwrap();</span>
<span class="doccomment">/// assert_eq!(&buf, "hola");</span>
<span class="doccomment">/// ```</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">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>;
<span class="doccomment">/// Writes a [`char`] into this writer, returning whether the write succeeded.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A single [`char`] may be encoded as more than one byte.</span>
<span class="doccomment">/// This method can only succeed if the entire byte sequence was successfully</span>
<span class="doccomment">/// written, and this method will not return until all data has been</span>
<span class="doccomment">/// written or an error occurs.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will return an instance of [`Error`] on error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</span>
<span class="doccomment">/// [`Error`]: struct.Error.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt::{Error, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn writer<W: Write>(f: &mut W, c: char) -> Result<(), Error> {</span>
<span class="doccomment">/// f.write_char(c)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buf = String::new();</span>
<span class="doccomment">/// writer(&mut buf, 'a').unwrap();</span>
<span class="doccomment">/// writer(&mut buf, 'b').unwrap();</span>
<span class="doccomment">/// assert_eq!(&buf, "ab");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_write_char"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.1.0"</span>)]</span>
<span class="kw">fn</span> <span class="ident">write_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">write_str</span>(<span class="ident">c</span>.<span class="ident">encode_utf8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="number">0</span>; <span class="number">4</span>]))
}
<span class="doccomment">/// Glue for usage of the [`write!`] macro with implementors of this trait.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method should generally not be invoked manually, but rather through</span>
<span class="doccomment">/// the [`write!`] macro itself.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`write!`]: ../../std/macro.write.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt::{Error, Write};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn writer<W: Write>(f: &mut W, s: &str) -> Result<(), Error> {</span>
<span class="doccomment">/// f.write_fmt(format_args!("{}", s))</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buf = String::new();</span>
<span class="doccomment">/// writer(&mut buf, "world").unwrap();</span>
<span class="doccomment">/// assert_eq!(&buf, "world");</span>
<span class="doccomment">/// ```</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">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="comment">// This Adapter is needed to allow `self` (of type `&mut</span>
<span class="comment">// Self`) to be cast to a Write (below) without</span>
<span class="comment">// requiring a `Sized` bound.</span>
<span class="kw">struct</span> <span class="ident">Adapter</span><span class="op"><</span><span class="lifetime">'a</span>,<span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>);
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Adapter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Write</span>
{
<span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">write_str</span>(<span class="ident">s</span>)
}
<span class="kw">fn</span> <span class="ident">write_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)
}
<span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">write_fmt</span>(<span class="ident">args</span>)
}
}
<span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Adapter</span>(<span class="self">self</span>), <span class="ident">args</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_write_blanket_impl"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">W</span>: <span class="ident">Write</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">W</span> {
<span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">write_str</span>(<span class="ident">s</span>)
}
<span class="kw">fn</span> <span class="ident">write_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">write_char</span>(<span class="ident">c</span>)
}
<span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">write_fmt</span>(<span class="ident">args</span>)
}
}
<span class="doccomment">/// A struct to represent both where to emit formatting strings to and how they</span>
<span class="doccomment">/// should be formatted. A mutable version of this is passed to all formatting</span>
<span class="doccomment">/// traits.</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</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">struct</span> <span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">flags</span>: <span class="ident">u32</span>,
<span class="ident">fill</span>: <span class="ident">char</span>,
<span class="ident">align</span>: <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>,
<span class="ident">width</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>,
<span class="ident">precision</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>,
<span class="ident">buf</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> (<span class="ident">Write</span><span class="op">+</span><span class="lifetime">'a</span>),
<span class="ident">curarg</span>: <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">>></span>,
<span class="ident">args</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>],
}
<span class="comment">// NB. Argument is essentially an optimized partially applied formatting function,</span>
<span class="comment">// equivalent to `exists T.(&T, fn(&T, &mut Formatter) -> Result`.</span>
<span class="kw">struct</span> <span class="ident">Void</span> {
<span class="ident">_priv</span>: (),
<span class="doccomment">/// Erases all oibits, because `Void` erases the type of the object that</span>
<span class="doccomment">/// will be used to produce formatted output. Since we do not know what</span>
<span class="doccomment">/// oibits the real types have (and they can have any or none), we need to</span>
<span class="doccomment">/// take the most conservative approach and forbid all oibits.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It was added after #45197 showed that one could share a `!Sync`</span>
<span class="doccomment">/// object across threads by passing it into `format_args!`.</span>
<span class="ident">_oibit_remover</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Fn</span>()<span class="op">></span>,
}
<span class="doccomment">/// This struct represents the generic "argument" which is taken by the Xprintf</span>
<span class="doccomment">/// family of functions. It contains a function to format the given value. At</span>
<span class="doccomment">/// compile time it is ensured that the function and the value have the correct</span>
<span class="doccomment">/// types, and then this struct is used to canonicalize arguments to one type.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">value</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Void</span>,
<span class="ident">formatter</span>: <span class="kw">fn</span>(<span class="kw-2">&</span><span class="ident">Void</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="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="kw">fn</span> <span class="ident">show_usize</span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">usize</span>, <span class="ident">f</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">Display</span>::<span class="ident">fmt</span>(<span class="ident">x</span>, <span class="ident">f</span>)
}
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">T</span>,
<span class="ident">f</span>: <span class="kw">fn</span>(<span class="kw-2">&</span><span class="ident">T</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="op">-></span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="ident">ArgumentV1</span> {
<span class="ident">formatter</span>: <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">f</span>),
<span class="ident">value</span>: <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">x</span>)
}
}
}
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ArgumentV1</span> {
<span class="ident">ArgumentV1</span>::<span class="ident">new</span>(<span class="ident">x</span>, <span class="ident">ArgumentV1</span>::<span class="ident">show_usize</span>)
}
<span class="kw">fn</span> <span class="ident">as_usize</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">formatter</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">==</span> <span class="ident">ArgumentV1</span>::<span class="ident">show_usize</span> <span class="kw">as</span> <span class="ident">usize</span> {
<span class="prelude-val">Some</span>(<span class="kw">unsafe</span> { <span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">value</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>) })
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
}
<span class="comment">// flags available in the v1 format of format_args</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">enum</span> <span class="ident">FlagV1</span> { <span class="ident">SignPlus</span>, <span class="ident">SignMinus</span>, <span class="ident">Alternate</span>, <span class="ident">SignAwareZeroPad</span>, <span class="ident">DebugLowerHex</span>, <span class="ident">DebugUpperHex</span> }
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// When using the format_args!() macro, this function is used to generate the</span>
<span class="doccomment">/// Arguments structure.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_v1</span>(<span class="ident">pieces</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>],
<span class="ident">args</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>]) <span class="op">-></span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">Arguments</span> {
<span class="ident">pieces</span>,
<span class="ident">fmt</span>: <span class="prelude-val">None</span>,
<span class="ident">args</span>,
}
}
<span class="doccomment">/// This function is used to specify nonstandard formatting parameters.</span>
<span class="doccomment">/// The `pieces` array must be at least as long as `fmt` to construct</span>
<span class="doccomment">/// a valid Arguments structure. Also, any `Count` within `fmt` that is</span>
<span class="doccomment">/// `CountIsParam` or `CountIsNextParam` has to point to an argument</span>
<span class="doccomment">/// created with `argumentusize`. However, failing to do so doesn't cause</span>
<span class="doccomment">/// unsafety, but will ignore invalid .</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_v1_formatted</span>(<span class="ident">pieces</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>],
<span class="ident">args</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>],
<span class="ident">fmt</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Argument</span>]) <span class="op">-></span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">Arguments</span> {
<span class="ident">pieces</span>,
<span class="ident">fmt</span>: <span class="prelude-val">Some</span>(<span class="ident">fmt</span>),
<span class="ident">args</span>,
}
}
<span class="doccomment">/// Estimates the length of the formatted text.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is intended to be used for setting initial `String` capacity</span>
<span class="doccomment">/// when using `format!`. Note: this is neither the lower nor upper bound.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">estimated_capacity</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="kw">let</span> <span class="ident">pieces_length</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pieces</span>.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">len</span>()).<span class="ident">sum</span>();
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">args</span>.<span class="ident">is_empty</span>() {
<span class="ident">pieces_length</span>
} <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">pieces</span>[<span class="number">0</span>] <span class="op">==</span> <span class="string">""</span> <span class="op">&&</span> <span class="ident">pieces_length</span> <span class="op"><</span> <span class="number">16</span> {
<span class="comment">// If the format string starts with an argument,</span>
<span class="comment">// don't preallocate anything, unless length</span>
<span class="comment">// of pieces is significant.</span>
<span class="number">0</span>
} <span class="kw">else</span> {
<span class="comment">// There are some arguments, so any additional push</span>
<span class="comment">// will reallocate the string. To avoid that,</span>
<span class="comment">// we're "pre-doubling" the capacity here.</span>
<span class="ident">pieces_length</span>.<span class="ident">checked_mul</span>(<span class="number">2</span>).<span class="ident">unwrap_or</span>(<span class="number">0</span>)
}
}
}
<span class="doccomment">/// This structure represents a safely precompiled version of a format string</span>
<span class="doccomment">/// and its arguments. This cannot be generated at runtime because it cannot</span>
<span class="doccomment">/// safely be done, so no constructors are given and the fields are private</span>
<span class="doccomment">/// to prevent modification.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`format_args!`] macro will safely create an instance of this structure.</span>
<span class="doccomment">/// The macro validates the format string at compile-time so usage of the</span>
<span class="doccomment">/// [`write`] and [`format`] functions can be safely performed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You can use the `Arguments<'a>` that [`format_args!`] returns in `Debug`</span>
<span class="doccomment">/// and `Display` contexts as seen below. The example also shows that `Debug`</span>
<span class="doccomment">/// and `Display` format to the same thing: the interpolated format string</span>
<span class="doccomment">/// in `format_args!`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// let debug = format!("{:?}", format_args!("{} foo {:?}", 1, 2));</span>
<span class="doccomment">/// let display = format!("{}", format_args!("{} foo {:?}", 1, 2));</span>
<span class="doccomment">/// assert_eq!("1 foo 2", display);</span>
<span class="doccomment">/// assert_eq!(display, debug);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`format_args!`]: ../../std/macro.format_args.html</span>
<span class="doccomment">/// [`format`]: ../../std/fmt/fn.format.html</span>
<span class="doccomment">/// [`write`]: ../../std/fmt/fn.write.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="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="comment">// Format string pieces to print.</span>
<span class="ident">pieces</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>],
<span class="comment">// Placeholder specs, or `None` if all specs are default (as in "{}{}").</span>
<span class="ident">fmt</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Argument</span>]<span class="op">></span>,
<span class="comment">// Dynamic arguments for interpolation, to be interleaved with string</span>
<span class="comment">// pieces. (Every argument is preceded by a string piece.)</span>
<span class="ident">args</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</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="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></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">Display</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">fmt</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="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></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">write</span>(<span class="ident">fmt</span>.<span class="ident">buf</span>, <span class="kw-2">*</span><span class="self">self</span>)
}
}
<span class="doccomment">/// `?` formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Debug` should format the output in a programmer-facing, debugging context.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Generally speaking, you should just `derive` a `Debug` implementation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When used with the alternate format specifier `#?`, the output is pretty-printed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This trait can be used with `#[derive]` if all fields implement `Debug`. When</span>
<span class="doccomment">/// `derive`d for structs, it will use the name of the `struct`, then `{`, then a</span>
<span class="doccomment">/// comma-separated list of each field's name and `Debug` value, then `}`. For</span>
<span class="doccomment">/// `enum`s, it will use the name of the variant and, if applicable, `(`, then the</span>
<span class="doccomment">/// `Debug` values of the fields, then `)`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Deriving an implementation:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[derive(Debug)]</span>
<span class="doccomment">/// struct Point {</span>
<span class="doccomment">/// x: i32,</span>
<span class="doccomment">/// y: i32,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let origin = Point { x: 0, y: 0 };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("The origin is: {:?}", origin);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Manually implementing:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Point {</span>
<span class="doccomment">/// x: i32,</span>
<span class="doccomment">/// y: i32,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Debug for Point {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// write!(f, "Point {{ x: {}, y: {} }}", self.x, self.y)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let origin = Point { x: 0, y: 0 };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("The origin is: {:?}", origin);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This outputs:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```text</span>
<span class="doccomment">/// The origin is: Point { x: 0, y: 0 }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// There are a number of `debug_*` methods on [`Formatter`] to help you with manual</span>
<span class="doccomment">/// implementations, such as [`debug_struct`][debug_struct].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Debug` implementations using either `derive` or the debug builder API</span>
<span class="doccomment">/// on [`Formatter`] support pretty printing using the alternate flag: `{:#?}`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [debug_struct]: ../../std/fmt/struct.Formatter.html#method.debug_struct</span>
<span class="doccomment">/// [`Formatter`]: ../../std/fmt/struct.Formatter.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Pretty printing with `#?`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[derive(Debug)]</span>
<span class="doccomment">/// struct Point {</span>
<span class="doccomment">/// x: i32,</span>
<span class="doccomment">/// y: i32,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let origin = Point { x: 0, y: 0 };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("The origin is: {:#?}", origin);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This outputs:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```text</span>
<span class="doccomment">/// The origin is: Point {</span>
<span class="doccomment">/// x: 0,</span>
<span class="doccomment">/// y: 0</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</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="attribute">#[<span class="ident">rustc_on_unimplemented</span>(
<span class="ident">on</span>(<span class="ident">crate_local</span>, <span class="ident">label</span><span class="op">=</span><span class="string">"`{Self}` cannot be formatted using `{{:?}}`"</span>,
<span class="ident">note</span><span class="op">=</span><span class="string">"add `#[derive(Debug)]` or manually implement `{Debug}`"</span>),
<span class="ident">message</span><span class="op">=</span><span class="string">"`{Self}` doesn't implement `{Debug}`"</span>,
<span class="ident">label</span><span class="op">=</span><span class="string">"`{Self}` cannot be formatted using `{{:?}}` because it doesn't implement `{Debug}`"</span>,
)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">alias</span> <span class="op">=</span> <span class="string">"{:?}"</span>)]</span>
<span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"debug_trait"</span>]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Debug</span> {
<span class="doccomment">/// Formats the value using the given formatter.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Position {</span>
<span class="doccomment">/// longitude: f32,</span>
<span class="doccomment">/// latitude: f32,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Debug for Position {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// write!(f, "({:?}, {:?})", self.longitude, self.latitude)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!("(1.987, 2.983)".to_owned(),</span>
<span class="doccomment">/// format!("{:?}", Position { longitude: 1.987, latitude: 2.983, }));</span>
<span class="doccomment">/// ```</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// Format trait for an empty format, `{}`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Display` is similar to [`Debug`][debug], but `Display` is for user-facing</span>
<span class="doccomment">/// output, and so cannot be derived.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [debug]: trait.Debug.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `Display` on a type:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Point {</span>
<span class="doccomment">/// x: i32,</span>
<span class="doccomment">/// y: i32,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Point {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// write!(f, "({}, {})", self.x, self.y)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let origin = Point { x: 0, y: 0 };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("The origin is: {}", origin);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">rustc_on_unimplemented</span>(
<span class="ident">message</span><span class="op">=</span><span class="string">"`{Self}` doesn't implement `{Display}`"</span>,
<span class="ident">label</span><span class="op">=</span><span class="string">"`{Self}` cannot be formatted with the default formatter"</span>,
<span class="ident">note</span><span class="op">=</span><span class="string">"in format strings you may be able to use `{{:?}}` \
(or {{:#?}} for pretty-print) instead"</span>,
)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">alias</span> <span class="op">=</span> <span class="string">"{}"</span>)]</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">trait</span> <span class="ident">Display</span> {
<span class="doccomment">/// Formats the value using the given formatter.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Position {</span>
<span class="doccomment">/// longitude: f32,</span>
<span class="doccomment">/// latitude: f32,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Position {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// write!(f, "({}, {})", self.longitude, self.latitude)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!("(1.987, 2.983)".to_owned(),</span>
<span class="doccomment">/// format!("{}", Position { longitude: 1.987, latitude: 2.983, }));</span>
<span class="doccomment">/// ```</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// `o` formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `Octal` trait should format its output as a number in base-8.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For primitive signed integers (`i8` to `i128`, and `isize`),</span>
<span class="doccomment">/// negative values are formatted as the two’s complement representation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The alternate flag, `#`, adds a `0o` in front of the output.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage with `i32`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let x = 42; // 42 is '52' in octal</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:o}", x), "52");</span>
<span class="doccomment">/// assert_eq!(format!("{:#o}", x), "0o52");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:o}", -16), "37777777760");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `Octal` on a type:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Length(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Octal for Length {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// let val = self.0;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// write!(f, "{:o}", val) // delegate to i32's implementation</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let l = Length(9);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("l as octal is: {:o}", l);</span>
<span class="doccomment">/// ```</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">trait</span> <span class="ident">Octal</span> {
<span class="doccomment">/// Formats the value using the given formatter.</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// `b` formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `Binary` trait should format its output as a number in binary.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For primitive signed integers ([`i8`] to [`i128`], and [`isize`]),</span>
<span class="doccomment">/// negative values are formatted as the two’s complement representation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The alternate flag, `#`, adds a `0b` in front of the output.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage with [`i32`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let x = 42; // 42 is '101010' in binary</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:b}", x), "101010");</span>
<span class="doccomment">/// assert_eq!(format!("{:#b}", x), "0b101010");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:b}", -16), "11111111111111111111111111110000");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `Binary` on a type:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Length(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Binary for Length {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// let val = self.0;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// write!(f, "{:b}", val) // delegate to i32's implementation</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let l = Length(107);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("l as binary is: {:b}", l);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">/// [`i8`]: ../../std/primitive.i8.html</span>
<span class="doccomment">/// [`i128`]: ../../std/primitive.i128.html</span>
<span class="doccomment">/// [`isize`]: ../../std/primitive.isize.html</span>
<span class="doccomment">/// [`i32`]: ../../std/primitive.i32.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">pub</span> <span class="kw">trait</span> <span class="ident">Binary</span> {
<span class="doccomment">/// Formats the value using the given formatter.</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// `x` formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `LowerHex` trait should format its output as a number in hexadecimal, with `a` through `f`</span>
<span class="doccomment">/// in lower case.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For primitive signed integers (`i8` to `i128`, and `isize`),</span>
<span class="doccomment">/// negative values are formatted as the two’s complement representation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The alternate flag, `#`, adds a `0x` in front of the output.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage with `i32`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let x = 42; // 42 is '2a' in hex</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:x}", x), "2a");</span>
<span class="doccomment">/// assert_eq!(format!("{:#x}", x), "0x2a");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:x}", -16), "fffffff0");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `LowerHex` on a type:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Length(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::LowerHex for Length {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// let val = self.0;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// write!(f, "{:x}", val) // delegate to i32's implementation</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let l = Length(9);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("l as hex is: {:x}", l);</span>
<span class="doccomment">/// ```</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">trait</span> <span class="ident">LowerHex</span> {
<span class="doccomment">/// Formats the value using the given formatter.</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// `X` formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `UpperHex` trait should format its output as a number in hexadecimal, with `A` through `F`</span>
<span class="doccomment">/// in upper case.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For primitive signed integers (`i8` to `i128`, and `isize`),</span>
<span class="doccomment">/// negative values are formatted as the two’s complement representation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The alternate flag, `#`, adds a `0x` in front of the output.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage with `i32`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let x = 42; // 42 is '2A' in hex</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:X}", x), "2A");</span>
<span class="doccomment">/// assert_eq!(format!("{:#X}", x), "0x2A");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:X}", -16), "FFFFFFF0");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `UpperHex` on a type:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Length(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::UpperHex for Length {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// let val = self.0;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// write!(f, "{:X}", val) // delegate to i32's implementation</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let l = Length(9);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("l as hex is: {:X}", l);</span>
<span class="doccomment">/// ```</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">trait</span> <span class="ident">UpperHex</span> {
<span class="doccomment">/// Formats the value using the given formatter.</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// `p` formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `Pointer` trait should format its output as a memory location. This is commonly presented</span>
<span class="doccomment">/// as hexadecimal.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage with `&i32`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let x = &42;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let address = format!("{:p}", x); // this produces something like '0x7f06092ac6d0'</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `Pointer` on a type:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Length(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Pointer for Length {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// // use `as` to convert to a `*const T`, which implements Pointer, which we can use</span>
<span class="doccomment">///</span>
<span class="doccomment">/// write!(f, "{:p}", self as *const Length)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let l = Length(42);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("l is in memory here: {:p}", l);</span>
<span class="doccomment">/// ```</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">trait</span> <span class="ident">Pointer</span> {
<span class="doccomment">/// Formats the value using the given formatter.</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// `e` formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `LowerExp` trait should format its output in scientific notation with a lower-case `e`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage with `i32`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let x = 42.0; // 42.0 is '4.2e1' in scientific notation</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:e}", x), "4.2e1");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `LowerExp` on a type:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Length(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::LowerExp for Length {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// let val = self.0;</span>
<span class="doccomment">/// write!(f, "{}e1", val / 10)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let l = Length(100);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("l in scientific notation is: {:e}", l);</span>
<span class="doccomment">/// ```</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">trait</span> <span class="ident">LowerExp</span> {
<span class="doccomment">/// Formats the value using the given formatter.</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// `E` formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `UpperExp` trait should format its output in scientific notation with an upper-case `E`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [module]: ../../std/fmt/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage with `f32`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let x = 42.0; // 42.0 is '4.2E1' in scientific notation</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(format!("{:E}", x), "4.2E1");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementing `UpperExp` on a type:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Length(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::UpperExp for Length {</span>
<span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// let val = self.0;</span>
<span class="doccomment">/// write!(f, "{}E1", val / 10)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let l = Length(100);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("l in scientific notation is: {:E}", l);</span>
<span class="doccomment">/// ```</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">trait</span> <span class="ident">UpperExp</span> {
<span class="doccomment">/// Formats the value using the given formatter.</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">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="doccomment">/// The `write` function takes an output stream, and an `Arguments` struct</span>
<span class="doccomment">/// that can be precompiled with the `format_args!` macro.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The arguments will be formatted according to the specified format string</span>
<span class="doccomment">/// into the output stream provided.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Basic usage:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut output = String::new();</span>
<span class="doccomment">/// fmt::write(&mut output, format_args!("Hello {}!", "world"))</span>
<span class="doccomment">/// .expect("Error occurred while trying to write in String");</span>
<span class="doccomment">/// assert_eq!(output, "Hello world!");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Please note that using [`write!`] might be preferable. Example:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt::Write;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut output = String::new();</span>
<span class="doccomment">/// write!(&mut output, "Hello {}!", "world")</span>
<span class="doccomment">/// .expect("Error occurred while trying to write in String");</span>
<span class="doccomment">/// assert_eq!(output, "Hello world!");</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`write!`]: ../../std/macro.write.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">pub</span> <span class="kw">fn</span> <span class="ident">write</span>(<span class="ident">output</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Write</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">formatter</span> <span class="op">=</span> <span class="ident">Formatter</span> {
<span class="ident">flags</span>: <span class="number">0</span>,
<span class="ident">width</span>: <span class="prelude-val">None</span>,
<span class="ident">precision</span>: <span class="prelude-val">None</span>,
<span class="ident">buf</span>: <span class="ident">output</span>,
<span class="ident">align</span>: <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Unknown</span>,
<span class="ident">fill</span>: <span class="string">' '</span>,
<span class="ident">args</span>: <span class="ident">args</span>.<span class="ident">args</span>,
<span class="ident">curarg</span>: <span class="ident">args</span>.<span class="ident">args</span>.<span class="ident">iter</span>(),
};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pieces</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">pieces</span>.<span class="ident">iter</span>();
<span class="kw">match</span> <span class="ident">args</span>.<span class="ident">fmt</span> {
<span class="prelude-val">None</span> <span class="op">=></span> {
<span class="comment">// We can use default formatting parameters for all arguments.</span>
<span class="kw">for</span> (<span class="ident">arg</span>, <span class="ident">piece</span>) <span class="kw">in</span> <span class="ident">args</span>.<span class="ident">args</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">pieces</span>.<span class="ident">by_ref</span>()) {
<span class="ident">formatter</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw-2">*</span><span class="ident">piece</span>)<span class="question-mark">?</span>;
(<span class="ident">arg</span>.<span class="ident">formatter</span>)(<span class="ident">arg</span>.<span class="ident">value</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">formatter</span>)<span class="question-mark">?</span>;
}
}
<span class="prelude-val">Some</span>(<span class="ident">fmt</span>) <span class="op">=></span> {
<span class="comment">// Every spec has a corresponding argument that is preceded by</span>
<span class="comment">// a string piece.</span>
<span class="kw">for</span> (<span class="ident">arg</span>, <span class="ident">piece</span>) <span class="kw">in</span> <span class="ident">fmt</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">pieces</span>.<span class="ident">by_ref</span>()) {
<span class="ident">formatter</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw-2">*</span><span class="ident">piece</span>)<span class="question-mark">?</span>;
<span class="ident">formatter</span>.<span class="ident">run</span>(<span class="ident">arg</span>)<span class="question-mark">?</span>;
}
}
}
<span class="comment">// There can be only one trailing string piece left.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">piece</span>) <span class="op">=</span> <span class="ident">pieces</span>.<span class="ident">next</span>() {
<span class="ident">formatter</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw-2">*</span><span class="ident">piece</span>)<span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(())
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">wrap_buf</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'c</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">wrap</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'c</span><span class="op">></span>
<span class="kw">where</span> <span class="lifetime">'b</span>: <span class="lifetime">'c</span>, <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> (<span class="ident">Write</span><span class="op">+</span><span class="lifetime">'b</span>)) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'c</span> <span class="kw-2">mut</span> (<span class="ident">Write</span><span class="op">+</span><span class="lifetime">'c</span>)
{
<span class="ident">Formatter</span> {
<span class="comment">// We want to change this</span>
<span class="ident">buf</span>: <span class="ident">wrap</span>(<span class="self">self</span>.<span class="ident">buf</span>),
<span class="comment">// And preserve these</span>
<span class="ident">flags</span>: <span class="self">self</span>.<span class="ident">flags</span>,
<span class="ident">fill</span>: <span class="self">self</span>.<span class="ident">fill</span>,
<span class="ident">align</span>: <span class="self">self</span>.<span class="ident">align</span>,
<span class="ident">width</span>: <span class="self">self</span>.<span class="ident">width</span>,
<span class="ident">precision</span>: <span class="self">self</span>.<span class="ident">precision</span>,
<span class="comment">// These only exist in the struct for the `run` method,</span>
<span class="comment">// which won’t be used together with this method.</span>
<span class="ident">curarg</span>: <span class="self">self</span>.<span class="ident">curarg</span>.<span class="ident">clone</span>(),
<span class="ident">args</span>: <span class="self">self</span>.<span class="ident">args</span>,
}
}
<span class="comment">// First up is the collection of functions used to execute a format string</span>
<span class="comment">// at runtime. This consumes all of the compile-time statics generated by</span>
<span class="comment">// the format! syntax extension.</span>
<span class="kw">fn</span> <span class="ident">run</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">arg</span>: <span class="kw-2">&</span><span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Argument</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="comment">// Fill in the format parameters into the formatter</span>
<span class="self">self</span>.<span class="ident">fill</span> <span class="op">=</span> <span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">fill</span>;
<span class="self">self</span>.<span class="ident">align</span> <span class="op">=</span> <span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">align</span>;
<span class="self">self</span>.<span class="ident">flags</span> <span class="op">=</span> <span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">flags</span>;
<span class="self">self</span>.<span class="ident">width</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">getcount</span>(<span class="kw-2">&</span><span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">width</span>);
<span class="self">self</span>.<span class="ident">precision</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">getcount</span>(<span class="kw-2">&</span><span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">precision</span>);
<span class="comment">// Extract the correct argument</span>
<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">arg</span>.<span class="ident">position</span> {
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Position</span>::<span class="ident">Next</span> <span class="op">=></span> { <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">curarg</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>() }
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Position</span>::<span class="ident">At</span>(<span class="ident">i</span>) <span class="op">=></span> <span class="self">self</span>.<span class="ident">args</span>[<span class="ident">i</span>],
};
<span class="comment">// Then actually do some printing</span>
(<span class="ident">value</span>.<span class="ident">formatter</span>)(<span class="ident">value</span>.<span class="ident">value</span>, <span class="self">self</span>)
}
<span class="kw">fn</span> <span class="ident">getcount</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cnt</span>: <span class="kw-2">&</span><span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="ident">cnt</span> {
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>::<span class="ident">Is</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">n</span>),
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>::<span class="ident">Implied</span> <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>::<span class="ident">Param</span>(<span class="ident">i</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">args</span>[<span class="ident">i</span>].<span class="ident">as_usize</span>()
}
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>::<span class="ident">NextParam</span> <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">curarg</span>.<span class="ident">next</span>().<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">arg</span><span class="op">|</span> <span class="ident">arg</span>.<span class="ident">as_usize</span>())
}
}
}
<span class="comment">// Helper methods used for padding and processing formatting arguments that</span>
<span class="comment">// all formatting traits can use.</span>
<span class="doccomment">/// Performs the correct padding for an integer which has already been</span>
<span class="doccomment">/// emitted into a str. The str should *not* contain the sign for the</span>
<span class="doccomment">/// integer, that will be added by this method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Arguments</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * is_nonnegative - whether the original integer was either positive or zero.</span>
<span class="doccomment">/// * prefix - if the '#' character (Alternate) is provided, this</span>
<span class="doccomment">/// is the prefix to put in front of the number.</span>
<span class="doccomment">/// * buf - the byte array that the number has been formatted into</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will correctly account for the flags provided as well as</span>
<span class="doccomment">/// the minimum width. It will not take precision into account.</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">fn</span> <span class="ident">pad_integral</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>,
<span class="ident">is_nonnegative</span>: <span class="ident">bool</span>,
<span class="ident">prefix</span>: <span class="kw-2">&</span><span class="ident">str</span>,
<span class="ident">buf</span>: <span class="kw-2">&</span><span class="ident">str</span>)
<span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">width</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sign</span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">if</span> <span class="op">!</span><span class="ident">is_nonnegative</span> {
<span class="ident">sign</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="string">'-'</span>); <span class="ident">width</span> <span class="op">+=</span> <span class="number">1</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">sign_plus</span>() {
<span class="ident">sign</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="string">'+'</span>); <span class="ident">width</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prefixed</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">alternate</span>() {
<span class="ident">prefixed</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="ident">width</span> <span class="op">+=</span> <span class="ident">prefix</span>.<span class="ident">chars</span>().<span class="ident">count</span>();
}
<span class="comment">// Writes the sign if it exists, and then the prefix if it was requested</span>
<span class="kw">let</span> <span class="ident">write_prefix</span> <span class="op">=</span> <span class="op">|</span><span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span><span class="op">|</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="ident">sign</span> {
<span class="ident">f</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">c</span>.<span class="ident">encode_utf8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="number">0</span>; <span class="number">4</span>]))<span class="question-mark">?</span>;
}
<span class="kw">if</span> <span class="ident">prefixed</span> { <span class="ident">f</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">prefix</span>) }
<span class="kw">else</span> { <span class="prelude-val">Ok</span>(()) }
};
<span class="comment">// The `width` field is more of a `min-width` parameter at this point.</span>
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">width</span> {
<span class="comment">// If there's no minimum length requirements then we can just</span>
<span class="comment">// write the bytes.</span>
<span class="prelude-val">None</span> <span class="op">=></span> {
<span class="ident">write_prefix</span>(<span class="self">self</span>)<span class="question-mark">?</span>; <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">buf</span>)
}
<span class="comment">// Check if we're over the minimum width, if so then we can also</span>
<span class="comment">// just write the bytes.</span>
<span class="prelude-val">Some</span>(<span class="ident">min</span>) <span class="kw">if</span> <span class="ident">width</span> <span class="op">>=</span> <span class="ident">min</span> <span class="op">=></span> {
<span class="ident">write_prefix</span>(<span class="self">self</span>)<span class="question-mark">?</span>; <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">buf</span>)
}
<span class="comment">// The sign and prefix goes before the padding if the fill character</span>
<span class="comment">// is zero</span>
<span class="prelude-val">Some</span>(<span class="ident">min</span>) <span class="kw">if</span> <span class="self">self</span>.<span class="ident">sign_aware_zero_pad</span>() <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">fill</span> <span class="op">=</span> <span class="string">'0'</span>;
<span class="self">self</span>.<span class="ident">align</span> <span class="op">=</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>;
<span class="ident">write_prefix</span>(<span class="self">self</span>)<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">with_padding</span>(<span class="ident">min</span> <span class="op">-</span> <span class="ident">width</span>, <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>, <span class="op">|</span><span class="ident">f</span><span class="op">|</span> {
<span class="ident">f</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">buf</span>)
})
}
<span class="comment">// Otherwise, the sign and prefix goes after the padding</span>
<span class="prelude-val">Some</span>(<span class="ident">min</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">with_padding</span>(<span class="ident">min</span> <span class="op">-</span> <span class="ident">width</span>, <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>, <span class="op">|</span><span class="ident">f</span><span class="op">|</span> {
<span class="ident">write_prefix</span>(<span class="ident">f</span>)<span class="question-mark">?</span>; <span class="ident">f</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">buf</span>)
})
}
}
}
<span class="doccomment">/// This function takes a string slice and emits it to the internal buffer</span>
<span class="doccomment">/// after applying the relevant formatting flags specified. The flags</span>
<span class="doccomment">/// recognized for generic strings are:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * width - the minimum width of what to emit</span>
<span class="doccomment">/// * fill/align - what to emit and where to emit it if the string</span>
<span class="doccomment">/// provided needs to be padded</span>
<span class="doccomment">/// * precision - the maximum length to emit, the string is truncated if it</span>
<span class="doccomment">/// is longer than this length</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Notably this function ignores the `flag` parameters.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// formatter.pad("Foo")</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(&format!("{:<4}", Foo), "Foo ");</span>
<span class="doccomment">/// assert_eq!(&format!("{:0>4}", Foo), "0Foo");</span>
<span class="doccomment">/// ```</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">fn</span> <span class="ident">pad</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="comment">// Make sure there's a fast path up front</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">width</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="self">self</span>.<span class="ident">precision</span>.<span class="ident">is_none</span>() {
<span class="kw">return</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>);
}
<span class="comment">// The `precision` field can be interpreted as a `max-width` for the</span>
<span class="comment">// string being formatted.</span>
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">max</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">precision</span> {
<span class="comment">// If our string is longer that the precision, then we must have</span>
<span class="comment">// truncation. However other flags like `fill`, `width` and `align`</span>
<span class="comment">// must act as always.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">i</span>, <span class="kw">_</span>)) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">char_indices</span>().<span class="ident">skip</span>(<span class="ident">max</span>).<span class="ident">next</span>() {
<span class="comment">// LLVM here can't prove that `..i` won't panic `&s[..i]`, but</span>
<span class="comment">// we know that it can't panic. Use `get` + `unwrap_or` to avoid</span>
<span class="comment">// `unsafe` and otherwise don't emit any panic-related code</span>
<span class="comment">// here.</span>
<span class="ident">s</span>.<span class="ident">get</span>(..<span class="ident">i</span>).<span class="ident">unwrap_or</span>(<span class="kw-2">&</span><span class="ident">s</span>)
} <span class="kw">else</span> {
<span class="kw-2">&</span><span class="ident">s</span>
}
} <span class="kw">else</span> {
<span class="kw-2">&</span><span class="ident">s</span>
};
<span class="comment">// The `width` field is more of a `min-width` parameter at this point.</span>
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">width</span> {
<span class="comment">// If we're under the maximum length, and there's no minimum length</span>
<span class="comment">// requirements, then we can just emit the string</span>
<span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>),
<span class="comment">// If we're under the maximum width, check if we're over the minimum</span>
<span class="comment">// width, if so it's as easy as just emitting the string.</span>
<span class="prelude-val">Some</span>(<span class="ident">width</span>) <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">count</span>() <span class="op">>=</span> <span class="ident">width</span> <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>)
}
<span class="comment">// If we're under both the maximum and the minimum width, then fill</span>
<span class="comment">// up the minimum width with the specified string + some alignment.</span>
<span class="prelude-val">Some</span>(<span class="ident">width</span>) <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Left</span>;
<span class="self">self</span>.<span class="ident">with_padding</span>(<span class="ident">width</span> <span class="op">-</span> <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">count</span>(), <span class="ident">align</span>, <span class="op">|</span><span class="ident">me</span><span class="op">|</span> {
<span class="ident">me</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>)
})
}
}
}
<span class="doccomment">/// Runs a callback, emitting the correct padding either before or</span>
<span class="doccomment">/// afterwards depending on whether right or left alignment is requested.</span>
<span class="kw">fn</span> <span class="ident">with_padding</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">padding</span>: <span class="ident">usize</span>, <span class="ident">default</span>: <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>,
<span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</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="kw">let</span> <span class="ident">align</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">align</span> {
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Unknown</span> <span class="op">=></span> <span class="ident">default</span>,
<span class="kw">_</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">align</span>
};
<span class="kw">let</span> (<span class="ident">pre_pad</span>, <span class="ident">post_pad</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">align</span> {
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Left</span> <span class="op">=></span> (<span class="number">0</span>, <span class="ident">padding</span>),
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span> <span class="op">|</span>
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Unknown</span> <span class="op">=></span> (<span class="ident">padding</span>, <span class="number">0</span>),
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Center</span> <span class="op">=></span> (<span class="ident">padding</span> <span class="op">/</span> <span class="number">2</span>, (<span class="ident">padding</span> <span class="op">+</span> <span class="number">1</span>) <span class="op">/</span> <span class="number">2</span>),
};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fill</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">4</span>];
<span class="kw">let</span> <span class="ident">fill</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">fill</span>.<span class="ident">encode_utf8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fill</span>);
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">pre_pad</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">fill</span>)<span class="question-mark">?</span>;
}
<span class="ident">f</span>(<span class="self">self</span>)<span class="question-mark">?</span>;
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">post_pad</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">fill</span>)<span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Takes the formatted parts and applies the padding.</span>
<span class="doccomment">/// Assumes that the caller already has rendered the parts with required precision,</span>
<span class="doccomment">/// so that `self.precision` can be ignored.</span>
<span class="kw">fn</span> <span class="ident">pad_formatted_parts</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">formatted</span>: <span class="kw-2">&</span><span class="ident">flt2dec</span>::<span class="ident">Formatted</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">width</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">width</span> {
<span class="comment">// for the sign-aware zero padding, we render the sign first and</span>
<span class="comment">// behave as if we had no sign from the beginning.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">formatted</span> <span class="op">=</span> <span class="ident">formatted</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">old_fill</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">fill</span>;
<span class="kw">let</span> <span class="ident">old_align</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">align</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">align</span> <span class="op">=</span> <span class="ident">old_align</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">sign_aware_zero_pad</span>() {
<span class="comment">// a sign always goes first</span>
<span class="kw">let</span> <span class="ident">sign</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="ident">formatted</span>.<span class="ident">sign</span>) };
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">sign</span>)<span class="question-mark">?</span>;
<span class="comment">// remove the sign from the formatted parts</span>
<span class="ident">formatted</span>.<span class="ident">sign</span> <span class="op">=</span> <span class="string">b""</span>;
<span class="ident">width</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">width</span> <span class="op"><</span> <span class="ident">sign</span>.<span class="ident">len</span>() { <span class="number">0</span> } <span class="kw">else</span> { <span class="ident">width</span> <span class="op">-</span> <span class="ident">sign</span>.<span class="ident">len</span>() };
<span class="ident">align</span> <span class="op">=</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>;
<span class="self">self</span>.<span class="ident">fill</span> <span class="op">=</span> <span class="string">'0'</span>;
<span class="self">self</span>.<span class="ident">align</span> <span class="op">=</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>;
}
<span class="comment">// remaining parts go through the ordinary padding process.</span>
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">formatted</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">width</span> <span class="op"><=</span> <span class="ident">len</span> { <span class="comment">// no padding</span>
<span class="self">self</span>.<span class="ident">write_formatted_parts</span>(<span class="kw-2">&</span><span class="ident">formatted</span>)
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">with_padding</span>(<span class="ident">width</span> <span class="op">-</span> <span class="ident">len</span>, <span class="ident">align</span>, <span class="op">|</span><span class="ident">f</span><span class="op">|</span> {
<span class="ident">f</span>.<span class="ident">write_formatted_parts</span>(<span class="kw-2">&</span><span class="ident">formatted</span>)
})
};
<span class="self">self</span>.<span class="ident">fill</span> <span class="op">=</span> <span class="ident">old_fill</span>;
<span class="self">self</span>.<span class="ident">align</span> <span class="op">=</span> <span class="ident">old_align</span>;
<span class="ident">ret</span>
} <span class="kw">else</span> {
<span class="comment">// this is the common case and we take a shortcut</span>
<span class="self">self</span>.<span class="ident">write_formatted_parts</span>(<span class="ident">formatted</span>)
}
}
<span class="kw">fn</span> <span class="ident">write_formatted_parts</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">formatted</span>: <span class="kw-2">&</span><span class="ident">flt2dec</span>::<span class="ident">Formatted</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="kw">fn</span> <span class="ident">write_bytes</span>(<span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Write</span>, <span class="ident">s</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw">unsafe</span> { <span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="ident">s</span>) })
}
<span class="kw">if</span> <span class="op">!</span><span class="ident">formatted</span>.<span class="ident">sign</span>.<span class="ident">is_empty</span>() {
<span class="ident">write_bytes</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="ident">formatted</span>.<span class="ident">sign</span>)<span class="question-mark">?</span>;
}
<span class="kw">for</span> <span class="ident">part</span> <span class="kw">in</span> <span class="ident">formatted</span>.<span class="ident">parts</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="ident">part</span> {
<span class="ident">flt2dec</span>::<span class="ident">Part</span>::<span class="ident">Zero</span>(<span class="kw-2">mut</span> <span class="ident">nzeroes</span>) <span class="op">=></span> {
<span class="kw">const</span> <span class="ident">ZEROES</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> <span class="op">=</span> <span class="comment">// 64 zeroes</span>
<span class="string">"0000000000000000000000000000000000000000000000000000000000000000"</span>;
<span class="kw">while</span> <span class="ident">nzeroes</span> <span class="op">></span> <span class="ident">ZEROES</span>.<span class="ident">len</span>() {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">ZEROES</span>)<span class="question-mark">?</span>;
<span class="ident">nzeroes</span> <span class="op">-=</span> <span class="ident">ZEROES</span>.<span class="ident">len</span>();
}
<span class="kw">if</span> <span class="ident">nzeroes</span> <span class="op">></span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="ident">ZEROES</span>[..<span class="ident">nzeroes</span>])<span class="question-mark">?</span>;
}
}
<span class="ident">flt2dec</span>::<span class="ident">Part</span>::<span class="ident">Num</span>(<span class="kw-2">mut</span> <span class="ident">v</span>) <span class="op">=></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">5</span>];
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">part</span>.<span class="ident">len</span>();
<span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="ident">s</span>[..<span class="ident">len</span>].<span class="ident">iter_mut</span>().<span class="ident">rev</span>() {
<span class="kw-2">*</span><span class="ident">c</span> <span class="op">=</span> <span class="string">b'0'</span> <span class="op">+</span> (<span class="ident">v</span> <span class="op">%</span> <span class="number">10</span>) <span class="kw">as</span> <span class="ident">u8</span>;
<span class="ident">v</span> <span class="op">/=</span> <span class="number">10</span>;
}
<span class="ident">write_bytes</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="kw-2">&</span><span class="ident">s</span>[..<span class="ident">len</span>])<span class="question-mark">?</span>;
}
<span class="ident">flt2dec</span>::<span class="ident">Part</span>::<span class="ident">Copy</span>(<span class="ident">buf</span>) <span class="op">=></span> {
<span class="ident">write_bytes</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="ident">buf</span>)<span class="question-mark">?</span>;
}
}
}
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Writes some data to the underlying buffer contained within this</span>
<span class="doccomment">/// formatter.</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">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">data</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">data</span>)
}
<span class="doccomment">/// Writes some formatted information into this instance.</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">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">fmt</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="ident">write</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="ident">fmt</span>)
}
<span class="doccomment">/// Flags for formatting</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="attribute">#[<span class="ident">rustc_deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"use the `sign_plus`, `sign_minus`, `alternate`, \
or `sign_aware_zero_pad` methods instead"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">flags</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u32</span> { <span class="self">self</span>.<span class="ident">flags</span> }
<span class="doccomment">/// Character used as 'fill' whenever there is alignment.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// let c = formatter.fill();</span>
<span class="doccomment">/// if let Some(width) = formatter.width() {</span>
<span class="doccomment">/// for _ in 0..width {</span>
<span class="doccomment">/// write!(formatter, "{}", c)?;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// write!(formatter, "{}", c)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // We set alignment to the left with ">".</span>
<span class="doccomment">/// assert_eq!(&format!("{:G>3}", Foo), "GGG");</span>
<span class="doccomment">/// assert_eq!(&format!("{:t>6}", Foo), "tttttt");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fill</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">char</span> { <span class="self">self</span>.<span class="ident">fill</span> }
<span class="doccomment">/// Flag indicating what form of alignment was requested.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// extern crate core;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::fmt::{self, Alignment};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// let s = if let Some(s) = formatter.align() {</span>
<span class="doccomment">/// match s {</span>
<span class="doccomment">/// Alignment::Left => "left",</span>
<span class="doccomment">/// Alignment::Right => "right",</span>
<span class="doccomment">/// Alignment::Center => "center",</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// "into the void"</span>
<span class="doccomment">/// };</span>
<span class="doccomment">/// write!(formatter, "{}", s)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// assert_eq!(&format!("{:<}", Foo), "left");</span>
<span class="doccomment">/// assert_eq!(&format!("{:>}", Foo), "right");</span>
<span class="doccomment">/// assert_eq!(&format!("{:^}", Foo), "center");</span>
<span class="doccomment">/// assert_eq!(&format!("{}", Foo), "into the void");</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags_align"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.28.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">align</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Alignment</span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">align</span> {
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Left</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">Alignment</span>::<span class="ident">Left</span>),
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">Alignment</span>::<span class="ident">Right</span>),
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Center</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">Alignment</span>::<span class="ident">Center</span>),
<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Unknown</span> <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Optionally specified integer width that the output should be.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// if let Some(width) = formatter.width() {</span>
<span class="doccomment">/// // If we received a width, we use it</span>
<span class="doccomment">/// write!(formatter, "{:width$}", &format!("Foo({})", self.0), width = width)</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// // Otherwise we do nothing special</span>
<span class="doccomment">/// write!(formatter, "Foo({})", self.0)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(&format!("{:10}", Foo(23)), "Foo(23) ");</span>
<span class="doccomment">/// assert_eq!(&format!("{}", Foo(23)), "Foo(23)");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">width</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">width</span> }
<span class="doccomment">/// Optionally specified precision for numeric types.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(f32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// if let Some(precision) = formatter.precision() {</span>
<span class="doccomment">/// // If we received a precision, we use it.</span>
<span class="doccomment">/// write!(formatter, "Foo({1:.*})", precision, self.0)</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// // Otherwise we default to 2.</span>
<span class="doccomment">/// write!(formatter, "Foo({:.2})", self.0)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(&format!("{:.4}", Foo(23.2)), "Foo(23.2000)");</span>
<span class="doccomment">/// assert_eq!(&format!("{}", Foo(23.2)), "Foo(23.20)");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">precision</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">precision</span> }
<span class="doccomment">/// Determines if the `+` flag was specified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// if formatter.sign_plus() {</span>
<span class="doccomment">/// write!(formatter,</span>
<span class="doccomment">/// "Foo({}{})",</span>
<span class="doccomment">/// if self.0 < 0 { '-' } else { '+' },</span>
<span class="doccomment">/// self.0)</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// write!(formatter, "Foo({})", self.0)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(&format!("{:+}", Foo(23)), "Foo(+23)");</span>
<span class="doccomment">/// assert_eq!(&format!("{}", Foo(23)), "Foo(23)");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sign_plus</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">SignPlus</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> }
<span class="doccomment">/// Determines if the `-` flag was specified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// if formatter.sign_minus() {</span>
<span class="doccomment">/// // You want a minus sign? Have one!</span>
<span class="doccomment">/// write!(formatter, "-Foo({})", self.0)</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// write!(formatter, "Foo({})", self.0)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(&format!("{:-}", Foo(23)), "-Foo(23)");</span>
<span class="doccomment">/// assert_eq!(&format!("{}", Foo(23)), "Foo(23)");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sign_minus</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">SignMinus</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> }
<span class="doccomment">/// Determines if the `#` flag was specified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// if formatter.alternate() {</span>
<span class="doccomment">/// write!(formatter, "Foo({})", self.0)</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// write!(formatter, "{}", self.0)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(&format!("{:#}", Foo(23)), "Foo(23)");</span>
<span class="doccomment">/// assert_eq!(&format!("{}", Foo(23)), "23");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">alternate</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">Alternate</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> }
<span class="doccomment">/// Determines if the `0` flag was specified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(i32);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Display for Foo {</span>
<span class="doccomment">/// fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// assert!(formatter.sign_aware_zero_pad());</span>
<span class="doccomment">/// assert_eq!(formatter.width(), Some(4));</span>
<span class="doccomment">/// // We ignore the formatter's options.</span>
<span class="doccomment">/// write!(formatter, "{}", self.0)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(&format!("{:04}", Foo(23)), "23");</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sign_aware_zero_pad</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">SignAwareZeroPad</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span>
}
<span class="comment">// FIXME: Decide what public API we want for these two flags.</span>
<span class="comment">// https://github.com/rust-lang/rust/issues/48584</span>
<span class="kw">fn</span> <span class="ident">debug_lower_hex</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">DebugLowerHex</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> }
<span class="kw">fn</span> <span class="ident">debug_upper_hex</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">DebugUpperHex</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> }
<span class="doccomment">/// Creates a [`DebugStruct`] builder designed to assist with creation of</span>
<span class="doccomment">/// [`fmt::Debug`] implementations for structs.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`DebugStruct`]: ../../std/fmt/struct.DebugStruct.html</span>
<span class="doccomment">/// [`fmt::Debug`]: ../../std/fmt/trait.Debug.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">/// use std::net::Ipv4Addr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo {</span>
<span class="doccomment">/// bar: i32,</span>
<span class="doccomment">/// baz: String,</span>
<span class="doccomment">/// addr: Ipv4Addr,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Debug for Foo {</span>
<span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// fmt.debug_struct("Foo")</span>
<span class="doccomment">/// .field("bar", &self.bar)</span>
<span class="doccomment">/// .field("baz", &self.baz)</span>
<span class="doccomment">/// .field("addr", &format_args!("{}", self.addr))</span>
<span class="doccomment">/// .finish()</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// "Foo { bar: 10, baz: \"Hello World\", addr: 127.0.0.1 }",</span>
<span class="doccomment">/// format!("{:?}", Foo {</span>
<span class="doccomment">/// bar: 10,</span>
<span class="doccomment">/// baz: "Hello World".to_string(),</span>
<span class="doccomment">/// addr: Ipv4Addr::new(127, 0, 0, 1),</span>
<span class="doccomment">/// })</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_struct</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">DebugStruct</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">builders</span>::<span class="ident">debug_struct_new</span>(<span class="self">self</span>, <span class="ident">name</span>)
}
<span class="doccomment">/// Creates a `DebugTuple` builder designed to assist with creation of</span>
<span class="doccomment">/// `fmt::Debug` implementations for tuple structs.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">/// use std::marker::PhantomData;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo<T>(i32, String, PhantomData<T>);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl<T> fmt::Debug for Foo<T> {</span>
<span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// fmt.debug_tuple("Foo")</span>
<span class="doccomment">/// .field(&self.0)</span>
<span class="doccomment">/// .field(&self.1)</span>
<span class="doccomment">/// .field(&format_args!("_"))</span>
<span class="doccomment">/// .finish()</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// "Foo(10, \"Hello\", _)",</span>
<span class="doccomment">/// format!("{:?}", Foo(10, "Hello".to_string(), PhantomData::<u8>))</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_tuple</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">DebugTuple</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">builders</span>::<span class="ident">debug_tuple_new</span>(<span class="self">self</span>, <span class="ident">name</span>)
}
<span class="doccomment">/// Creates a `DebugList` builder designed to assist with creation of</span>
<span class="doccomment">/// `fmt::Debug` implementations for list-like structures.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(Vec<i32>);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Debug for Foo {</span>
<span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// fmt.debug_list().entries(self.0.iter()).finish()</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // prints "[10, 11]"</span>
<span class="doccomment">/// println!("{:?}", Foo(vec![10, 11]));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_list</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">DebugList</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">builders</span>::<span class="ident">debug_list_new</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Creates a `DebugSet` builder designed to assist with creation of</span>
<span class="doccomment">/// `fmt::Debug` implementations for set-like structures.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(Vec<i32>);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Debug for Foo {</span>
<span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// fmt.debug_set().entries(self.0.iter()).finish()</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // prints "{10, 11}"</span>
<span class="doccomment">/// println!("{:?}", Foo(vec![10, 11]));</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`format_args!`]: ../../std/macro.format_args.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In this more complex example, we use [`format_args!`] and `.debug_set()`</span>
<span class="doccomment">/// to build a list of match arms:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Arm<'a, L: 'a, R: 'a>(&'a (L, R));</span>
<span class="doccomment">/// struct Table<'a, K: 'a, V: 'a>(&'a [(K, V)], V);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl<'a, L, R> fmt::Debug for Arm<'a, L, R></span>
<span class="doccomment">/// where</span>
<span class="doccomment">/// L: 'a + fmt::Debug, R: 'a + fmt::Debug</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// L::fmt(&(self.0).0, fmt)?;</span>
<span class="doccomment">/// fmt.write_str(" => ")?;</span>
<span class="doccomment">/// R::fmt(&(self.0).1, fmt)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl<'a, K, V> fmt::Debug for Table<'a, K, V></span>
<span class="doccomment">/// where</span>
<span class="doccomment">/// K: 'a + fmt::Debug, V: 'a + fmt::Debug</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// fmt.debug_set()</span>
<span class="doccomment">/// .entries(self.0.iter().map(Arm))</span>
<span class="doccomment">/// .entry(&Arm(&(format_args!("_"), &self.1)))</span>
<span class="doccomment">/// .finish()</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_set</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">DebugSet</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">builders</span>::<span class="ident">debug_set_new</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Creates a `DebugMap` builder designed to assist with creation of</span>
<span class="doccomment">/// `fmt::Debug` implementations for map-like structures.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::fmt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct Foo(Vec<(String, i32)>);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl fmt::Debug for Foo {</span>
<span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span>
<span class="doccomment">/// fmt.debug_map().entries(self.0.iter().map(|&(ref k, ref v)| (k, v))).finish()</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // prints "{"A": 10, "B": 11}"</span>
<span class="doccomment">/// println!("{:?}", Foo(vec![("A".to_string(), 10), ("B".to_string(), 11)]));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_map</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">DebugMap</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">builders</span>::<span class="ident">debug_map_new</span>(<span class="self">self</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"formatter_write"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>)
}
<span class="kw">fn</span> <span class="ident">write_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)
}
<span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> {
<span class="ident">write</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="ident">args</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="ident">Error</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Display</span>::<span class="ident">fmt</span>(<span class="string">"an error occurred when formatting an argument"</span>, <span class="ident">f</span>)
}
}
<span class="comment">// Implementations of the core formatting traits</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">fmt_refs</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span>:<span class="ident">ident</span>),<span class="kw-2">*</span>) <span class="op">=></span> {
$(
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</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="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</span>) }
}
)<span class="op">*</span>
}
}
<span class="macro">fmt_refs</span><span class="macro">!</span> { <span class="ident">Debug</span>, <span class="ident">Display</span>, <span class="ident">Octal</span>, <span class="ident">Binary</span>, <span class="ident">LowerHex</span>, <span class="ident">UpperHex</span>, <span class="ident">LowerExp</span>, <span class="ident">UpperExp</span> }
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"never_type"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35121"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="op">!</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</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="kw-2">*</span><span class="self">self</span>
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"never_type"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35121"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="op">!</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</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="kw-2">*</span><span class="self">self</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="ident">bool</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Display</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</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="ident">bool</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Display</span>::<span class="ident">fmt</span>(<span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="string">"true"</span> } <span class="kw">else</span> { <span class="string">"false"</span> }, <span class="ident">f</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="ident">str</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">write_char</span>(<span class="string">'"'</span>)<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">from</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">c</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">char_indices</span>() {
<span class="kw">let</span> <span class="ident">esc</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">escape_debug</span>();
<span class="comment">// If char needs escaping, flush backlog so far and write, else skip</span>
<span class="kw">if</span> <span class="ident">esc</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="number">1</span> {
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">from</span>..<span class="ident">i</span>])<span class="question-mark">?</span>;
<span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="ident">esc</span> {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)<span class="question-mark">?</span>;
}
<span class="ident">from</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">+</span> <span class="ident">c</span>.<span class="ident">len_utf8</span>();
}
}
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">from</span>..])<span class="question-mark">?</span>;
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="string">'"'</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="ident">str</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">pad</span>(<span class="self">self</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="ident">char</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">write_char</span>(<span class="string">'\''</span>)<span class="question-mark">?</span>;
<span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">escape_debug</span>() {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)<span class="question-mark">?</span>
}
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="string">'\''</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="ident">char</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="kw">if</span> <span class="ident">f</span>.<span class="ident">width</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="ident">f</span>.<span class="ident">precision</span>.<span class="ident">is_none</span>() {
<span class="ident">f</span>.<span class="ident">write_char</span>(<span class="kw-2">*</span><span class="self">self</span>)
} <span class="kw">else</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="self">self</span>.<span class="ident">encode_utf8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="number">0</span>; <span class="number">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">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Pointer</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="kw">let</span> <span class="ident">old_width</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">width</span>;
<span class="kw">let</span> <span class="ident">old_flags</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">flags</span>;
<span class="comment">// The alternate flag is already treated by LowerHex as being special-</span>
<span class="comment">// it denotes whether to prefix with 0x. We use it to work out whether</span>
<span class="comment">// or not to zero extend, and then unconditionally set it to get the</span>
<span class="comment">// prefix.</span>
<span class="kw">if</span> <span class="ident">f</span>.<span class="ident">alternate</span>() {
<span class="ident">f</span>.<span class="ident">flags</span> <span class="op">|=</span> <span class="number">1</span> <span class="op"><<</span> (<span class="ident">FlagV1</span>::<span class="ident">SignAwareZeroPad</span> <span class="kw">as</span> <span class="ident">u32</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">None</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">width</span> {
<span class="ident">f</span>.<span class="ident">width</span> <span class="op">=</span> <span class="prelude-val">Some</span>(((<span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>() <span class="op">*</span> <span class="number">8</span>) <span class="op">/</span> <span class="number">4</span>) <span class="op">+</span> <span class="number">2</span>);
}
}
<span class="ident">f</span>.<span class="ident">flags</span> <span class="op">|=</span> <span class="number">1</span> <span class="op"><<</span> (<span class="ident">FlagV1</span>::<span class="ident">Alternate</span> <span class="kw">as</span> <span class="ident">u32</span>);
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">LowerHex</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> () <span class="kw">as</span> <span class="ident">usize</span>), <span class="ident">f</span>);
<span class="ident">f</span>.<span class="ident">width</span> <span class="op">=</span> <span class="ident">old_width</span>;
<span class="ident">f</span>.<span class="ident">flags</span> <span class="op">=</span> <span class="ident">old_flags</span>;
<span class="ident">ret</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="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Pointer</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Pointer</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>), <span class="ident">f</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="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Pointer</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Pointer</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>), <span class="ident">f</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="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Pointer</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Pointer</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>), <span class="ident">f</span>)
}
}
<span class="comment">// Implementation of Display/Debug for various core types</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="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Pointer</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</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="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Pointer</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>) }
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">peel</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">other</span>:<span class="ident">ident</span>,)<span class="kw-2">*</span>) <span class="op">=></span> (<span class="macro">tuple</span><span class="macro">!</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">other</span>,)<span class="op">*</span> })
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">tuple</span> {
() <span class="op">=></span> ();
( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>,)<span class="op">+</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="op"><</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">Debug</span>),<span class="kw-2">*</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>,)<span class="kw-2">*</span>) <span class="kw">where</span> <span class="macro">last_type</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>,)<span class="op">+</span>): <span class="question-mark">?</span><span class="ident">Sized</span> {
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>, <span class="ident">unused_assignments</span>, <span class="ident">deprecated</span>)]</span>
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">""</span>);
<span class="kw">let</span> ($(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>,)<span class="kw-2">*</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>;
$(
<span class="ident">builder</span>.<span class="ident">field</span>(<span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>);
)<span class="op">*</span>
<span class="ident">builder</span>.<span class="ident">finish</span>()
}
}
<span class="macro">peel</span><span class="macro">!</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>,)<span class="op">*</span> }
)
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">last_type</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span>,) <span class="op">=></span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span> };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest_a</span>:<span class="ident">ident</span>,)<span class="op">+</span>) <span class="op">=></span> { <span class="macro">last_type</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest_a</span>,)<span class="op">+</span>) };
}
<span class="macro">tuple</span><span class="macro">!</span> { <span class="ident">T0</span>, <span class="ident">T1</span>, <span class="ident">T2</span>, <span class="ident">T3</span>, <span class="ident">T4</span>, <span class="ident">T5</span>, <span class="ident">T6</span>, <span class="ident">T7</span>, <span class="ident">T8</span>, <span class="ident">T9</span>, <span class="ident">T10</span>, <span class="ident">T11</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="op"><</span><span class="ident">T</span>: <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> [<span class="ident">T</span>] {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">iter</span>()).<span class="ident">finish</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="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">pad</span>(<span class="string">"()"</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="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">PhantomData</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">pad</span>(<span class="string">"PhantomData"</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="op"><</span><span class="ident">T</span>: <span class="ident">Copy</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Cell"</span>)
.<span class="ident">field</span>(<span class="string">"value"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">get</span>())
.<span class="ident">finish</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="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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="kw">match</span> <span class="self">self</span>.<span class="ident">try_borrow</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">borrow</span>) <span class="op">=></span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"RefCell"</span>)
.<span class="ident">field</span>(<span class="string">"value"</span>, <span class="kw-2">&</span><span class="ident">borrow</span>)
.<span class="ident">finish</span>()
}
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=></span> {
<span class="comment">// The RefCell is mutably borrowed so we can't look at its value</span>
<span class="comment">// here. Show a placeholder instead.</span>
<span class="kw">struct</span> <span class="ident">BorrowedPlaceholder</span>;
<span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">BorrowedPlaceholder</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">write_str</span>(<span class="string">"<borrowed>"</span>)
}
}
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"RefCell"</span>)
.<span class="ident">field</span>(<span class="string">"value"</span>, <span class="kw-2">&</span><span class="ident">BorrowedPlaceholder</span>)
.<span class="ident">finish</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="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</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="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">deref</span>()), <span class="ident">f</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</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">f</span>.<span class="ident">pad</span>(<span class="string">"UnsafeCell"</span>)
}
}
<span class="comment">// If you expected tests to be here, look instead at the run-pass/ifmt.rs test,</span>
<span class="comment">// it's a lot easier than creating all of the rt::Piece structures here.</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><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../../";window.currentCrate = "core";</script><script src="../../../aliases.js"></script><script src="../../../main.js"></script><script defer src="../../../search-index.js"></script></body></html>
