<!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/time.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>time.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 2012-2017 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration_core"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.25.0"</span>)]</span>
<span class="doccomment">//! Temporal quantification.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Example:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::time::Duration;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let five_seconds = Duration::new(5, 0);</span>
<span class="doccomment">//! // both declarations are equivalent</span>
<span class="doccomment">//! assert_eq!(Duration::new(5, 0), Duration::from_secs(5));</span>
<span class="doccomment">//! ```</span>
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">iter</span>::<span class="ident">Sum</span>;
<span class="kw">use</span> <span class="ident">ops</span>::{<span class="ident">Add</span>, <span class="ident">Sub</span>, <span class="ident">Mul</span>, <span class="ident">Div</span>, <span class="ident">AddAssign</span>, <span class="ident">SubAssign</span>, <span class="ident">MulAssign</span>, <span class="ident">DivAssign</span>};
<span class="kw">const</span> <span class="ident">NANOS_PER_SEC</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">1_000_000_000</span>;
<span class="kw">const</span> <span class="ident">NANOS_PER_MILLI</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">1_000_000</span>;
<span class="kw">const</span> <span class="ident">NANOS_PER_MICRO</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">1_000</span>;
<span class="kw">const</span> <span class="ident">MILLIS_PER_SEC</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1_000</span>;
<span class="kw">const</span> <span class="ident">MICROS_PER_SEC</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1_000_000</span>;
<span class="doccomment">/// A `Duration` type to represent a span of time, typically used for system</span>
<span class="doccomment">/// timeouts.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each `Duration` is composed of a whole number of seconds and a fractional part</span>
<span class="doccomment">/// represented in nanoseconds. If the underlying system does not support</span>
<span class="doccomment">/// nanosecond-level precision, APIs binding a system timeout will typically round up</span>
<span class="doccomment">/// the number of nanoseconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Duration`s implement many common traits, including [`Add`], [`Sub`], and other</span>
<span class="doccomment">/// [`ops`] traits.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Add`]: ../../std/ops/trait.Add.html</span>
<span class="doccomment">/// [`Sub`]: ../../std/ops/trait.Sub.html</span>
<span class="doccomment">/// [`ops`]: ../../std/ops/index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let five_seconds = Duration::new(5, 0);</span>
<span class="doccomment">/// let five_seconds_and_five_nanos = five_seconds + Duration::new(0, 5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(five_seconds_and_five_nanos.as_secs(), 5);</span>
<span class="doccomment">/// assert_eq!(five_seconds_and_five_nanos.subsec_nanos(), 5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ten_millis = Duration::from_millis(10);</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">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Hash</span>, <span class="ident">Default</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Duration</span> {
<span class="ident">secs</span>: <span class="ident">u64</span>,
<span class="ident">nanos</span>: <span class="ident">u32</span>, <span class="comment">// Always 0 <= nanos < NANOS_PER_SEC</span>
}
<span class="kw">impl</span> <span class="ident">Duration</span> {
<span class="doccomment">/// Creates a new `Duration` from the specified number of whole seconds and</span>
<span class="doccomment">/// additional nanoseconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the number of nanoseconds is greater than 1 billion (the number of</span>
<span class="doccomment">/// nanoseconds in a second), then it will carry over into the seconds provided.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This constructor will panic if the carry from the nanoseconds overflows</span>
<span class="doccomment">/// the seconds counter.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let five_seconds = Duration::new(5, 0);</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">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">secs</span>: <span class="ident">u64</span>, <span class="ident">nanos</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="kw">let</span> <span class="ident">secs</span> <span class="op">=</span> <span class="ident">secs</span>.<span class="ident">checked_add</span>((<span class="ident">nanos</span> <span class="op">/</span> <span class="ident">NANOS_PER_SEC</span>) <span class="kw">as</span> <span class="ident">u64</span>)
.<span class="ident">expect</span>(<span class="string">"overflow in Duration::new"</span>);
<span class="kw">let</span> <span class="ident">nanos</span> <span class="op">=</span> <span class="ident">nanos</span> <span class="op">%</span> <span class="ident">NANOS_PER_SEC</span>;
<span class="ident">Duration</span> { <span class="ident">secs</span>: <span class="ident">secs</span>, <span class="ident">nanos</span>: <span class="ident">nanos</span> }
}
<span class="doccomment">/// Creates a new `Duration` from the specified number of whole seconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::from_secs(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(5, duration.as_secs());</span>
<span class="doccomment">/// assert_eq!(0, duration.subsec_nanos());</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">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">from_secs</span>(<span class="ident">secs</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="ident">Duration</span> { <span class="ident">secs</span>: <span class="ident">secs</span>, <span class="ident">nanos</span>: <span class="number">0</span> }
}
<span class="doccomment">/// Creates a new `Duration` from the specified number of milliseconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::from_millis(2569);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(2, duration.as_secs());</span>
<span class="doccomment">/// assert_eq!(569_000_000, duration.subsec_nanos());</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">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">from_millis</span>(<span class="ident">millis</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="ident">Duration</span> {
<span class="ident">secs</span>: <span class="ident">millis</span> <span class="op">/</span> <span class="ident">MILLIS_PER_SEC</span>,
<span class="ident">nanos</span>: ((<span class="ident">millis</span> <span class="op">%</span> <span class="ident">MILLIS_PER_SEC</span>) <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">*</span> <span class="ident">NANOS_PER_MILLI</span>,
}
}
<span class="doccomment">/// Creates a new `Duration` from the specified number of microseconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::from_micros(1_000_002);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(1, duration.as_secs());</span>
<span class="doccomment">/// assert_eq!(2000, duration.subsec_nanos());</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">"duration_from_micros"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">from_micros</span>(<span class="ident">micros</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="ident">Duration</span> {
<span class="ident">secs</span>: <span class="ident">micros</span> <span class="op">/</span> <span class="ident">MICROS_PER_SEC</span>,
<span class="ident">nanos</span>: ((<span class="ident">micros</span> <span class="op">%</span> <span class="ident">MICROS_PER_SEC</span>) <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">*</span> <span class="ident">NANOS_PER_MICRO</span>,
}
}
<span class="doccomment">/// Creates a new `Duration` from the specified number of nanoseconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::from_nanos(1_000_000_123);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(1, duration.as_secs());</span>
<span class="doccomment">/// assert_eq!(123, duration.subsec_nanos());</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">"duration_extras"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">from_nanos</span>(<span class="ident">nanos</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="ident">Duration</span> {
<span class="ident">secs</span>: <span class="ident">nanos</span> <span class="op">/</span> (<span class="ident">NANOS_PER_SEC</span> <span class="kw">as</span> <span class="ident">u64</span>),
<span class="ident">nanos</span>: (<span class="ident">nanos</span> <span class="op">%</span> (<span class="ident">NANOS_PER_SEC</span> <span class="kw">as</span> <span class="ident">u64</span>)) <span class="kw">as</span> <span class="ident">u32</span>,
}
}
<span class="doccomment">/// Returns the number of _whole_ seconds contained by this `Duration`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned value does not include the fractional (nanosecond) part of the</span>
<span class="doccomment">/// duration, which can be obtained using [`subsec_nanos`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::new(5, 730023852);</span>
<span class="doccomment">/// assert_eq!(duration.as_secs(), 5);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To determine the total number of seconds represented by the `Duration`,</span>
<span class="doccomment">/// use `as_secs` in combination with [`subsec_nanos`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::new(5, 730023852);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(5.730023852,</span>
<span class="doccomment">/// duration.as_secs() as f64</span>
<span class="doccomment">/// + duration.subsec_nanos() as f64 * 1e-9);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`subsec_nanos`]: #method.subsec_nanos</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="attribute">#[<span class="ident">rustc_const_unstable</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"duration_getters"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">as_secs</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u64</span> { <span class="self">self</span>.<span class="ident">secs</span> }
<span class="doccomment">/// Returns the fractional part of this `Duration`, in milliseconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method does **not** return the length of the duration when</span>
<span class="doccomment">/// represented by milliseconds. The returned number always represents a</span>
<span class="doccomment">/// fractional portion of a second (i.e. it is less than one thousand).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::from_millis(5432);</span>
<span class="doccomment">/// assert_eq!(duration.as_secs(), 5);</span>
<span class="doccomment">/// assert_eq!(duration.subsec_millis(), 432);</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">"duration_extras"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span>
<span class="attribute">#[<span class="ident">rustc_const_unstable</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"duration_getters"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">subsec_millis</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">nanos</span> <span class="op">/</span> <span class="ident">NANOS_PER_MILLI</span> }
<span class="doccomment">/// Returns the fractional part of this `Duration`, in microseconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method does **not** return the length of the duration when</span>
<span class="doccomment">/// represented by microseconds. The returned number always represents a</span>
<span class="doccomment">/// fractional portion of a second (i.e. it is less than one million).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::from_micros(1_234_567);</span>
<span class="doccomment">/// assert_eq!(duration.as_secs(), 1);</span>
<span class="doccomment">/// assert_eq!(duration.subsec_micros(), 234_567);</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">"duration_extras"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span>
<span class="attribute">#[<span class="ident">rustc_const_unstable</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"duration_getters"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">subsec_micros</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">nanos</span> <span class="op">/</span> <span class="ident">NANOS_PER_MICRO</span> }
<span class="doccomment">/// Returns the fractional part of this `Duration`, in nanoseconds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method does **not** return the length of the duration when</span>
<span class="doccomment">/// represented by nanoseconds. The returned number always represents a</span>
<span class="doccomment">/// fractional portion of a second (i.e. it is less than one billion).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::from_millis(5010);</span>
<span class="doccomment">/// assert_eq!(duration.as_secs(), 5);</span>
<span class="doccomment">/// assert_eq!(duration.subsec_nanos(), 10_000_000);</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">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="attribute">#[<span class="ident">rustc_const_unstable</span>(<span class="ident">feature</span><span class="op">=</span><span class="string">"duration_getters"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">subsec_nanos</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">nanos</span> }
<span class="doccomment">/// Returns the total number of milliseconds contained by this `Duration`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #![feature(duration_as_u128)]</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::new(5, 730023852);</span>
<span class="doccomment">/// assert_eq!(duration.as_millis(), 5730);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration_as_u128"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"50202"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_millis</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u128</span> {
<span class="self">self</span>.<span class="ident">secs</span> <span class="kw">as</span> <span class="ident">u128</span> <span class="op">*</span> <span class="ident">MILLIS_PER_SEC</span> <span class="kw">as</span> <span class="ident">u128</span> <span class="op">+</span> (<span class="self">self</span>.<span class="ident">nanos</span> <span class="op">/</span> <span class="ident">NANOS_PER_MILLI</span>) <span class="kw">as</span> <span class="ident">u128</span>
}
<span class="doccomment">/// Returns the total number of microseconds contained by this `Duration`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #![feature(duration_as_u128)]</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::new(5, 730023852);</span>
<span class="doccomment">/// assert_eq!(duration.as_micros(), 5730023);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration_as_u128"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"50202"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_micros</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u128</span> {
<span class="self">self</span>.<span class="ident">secs</span> <span class="kw">as</span> <span class="ident">u128</span> <span class="op">*</span> <span class="ident">MICROS_PER_SEC</span> <span class="kw">as</span> <span class="ident">u128</span> <span class="op">+</span> (<span class="self">self</span>.<span class="ident">nanos</span> <span class="op">/</span> <span class="ident">NANOS_PER_MICRO</span>) <span class="kw">as</span> <span class="ident">u128</span>
}
<span class="doccomment">/// Returns the total number of nanoseconds contained by this `Duration`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #![feature(duration_as_u128)]</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let duration = Duration::new(5, 730023852);</span>
<span class="doccomment">/// assert_eq!(duration.as_nanos(), 5730023852);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration_as_u128"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"50202"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_nanos</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u128</span> {
<span class="self">self</span>.<span class="ident">secs</span> <span class="kw">as</span> <span class="ident">u128</span> <span class="op">*</span> <span class="ident">NANOS_PER_SEC</span> <span class="kw">as</span> <span class="ident">u128</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">nanos</span> <span class="kw">as</span> <span class="ident">u128</span>
}
<span class="doccomment">/// Checked `Duration` addition. Computes `self + other`, returning [`None`]</span>
<span class="doccomment">/// if overflow occurred.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`None`]: ../../std/option/enum.Option.html#variant.None</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::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Duration::new(0, 0).checked_add(Duration::new(0, 1)), Some(Duration::new(0, 1)));</span>
<span class="doccomment">/// assert_eq!(Duration::new(1, 0).checked_add(Duration::new(std::u64::MAX, 0)), None);</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">"duration_checked_ops"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">checked_add</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></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">secs</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">secs</span>.<span class="ident">checked_add</span>(<span class="ident">rhs</span>.<span class="ident">secs</span>) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">nanos</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">nanos</span> <span class="op">+</span> <span class="ident">rhs</span>.<span class="ident">nanos</span>;
<span class="kw">if</span> <span class="ident">nanos</span> <span class="op">>=</span> <span class="ident">NANOS_PER_SEC</span> {
<span class="ident">nanos</span> <span class="op">-=</span> <span class="ident">NANOS_PER_SEC</span>;
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">new_secs</span>) <span class="op">=</span> <span class="ident">secs</span>.<span class="ident">checked_add</span>(<span class="number">1</span>) {
<span class="ident">secs</span> <span class="op">=</span> <span class="ident">new_secs</span>;
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
}
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">nanos</span> <span class="op"><</span> <span class="ident">NANOS_PER_SEC</span>);
<span class="prelude-val">Some</span>(<span class="ident">Duration</span> {
<span class="ident">secs</span>,
<span class="ident">nanos</span>,
})
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="doccomment">/// Checked `Duration` subtraction. Computes `self - other`, returning [`None`]</span>
<span class="doccomment">/// if the result would be negative or if overflow occurred.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`None`]: ../../std/option/enum.Option.html#variant.None</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::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Duration::new(0, 1).checked_sub(Duration::new(0, 0)), Some(Duration::new(0, 1)));</span>
<span class="doccomment">/// assert_eq!(Duration::new(0, 0).checked_sub(Duration::new(0, 1)), None);</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">"duration_checked_ops"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">checked_sub</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></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">secs</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">secs</span>.<span class="ident">checked_sub</span>(<span class="ident">rhs</span>.<span class="ident">secs</span>) {
<span class="kw">let</span> <span class="ident">nanos</span> <span class="op">=</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">nanos</span> <span class="op">>=</span> <span class="ident">rhs</span>.<span class="ident">nanos</span> {
<span class="self">self</span>.<span class="ident">nanos</span> <span class="op">-</span> <span class="ident">rhs</span>.<span class="ident">nanos</span>
} <span class="kw">else</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">sub_secs</span>) <span class="op">=</span> <span class="ident">secs</span>.<span class="ident">checked_sub</span>(<span class="number">1</span>) {
<span class="ident">secs</span> <span class="op">=</span> <span class="ident">sub_secs</span>;
<span class="self">self</span>.<span class="ident">nanos</span> <span class="op">+</span> <span class="ident">NANOS_PER_SEC</span> <span class="op">-</span> <span class="ident">rhs</span>.<span class="ident">nanos</span>
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
};
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">nanos</span> <span class="op"><</span> <span class="ident">NANOS_PER_SEC</span>);
<span class="prelude-val">Some</span>(<span class="ident">Duration</span> { <span class="ident">secs</span>: <span class="ident">secs</span>, <span class="ident">nanos</span>: <span class="ident">nanos</span> })
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="doccomment">/// Checked `Duration` multiplication. Computes `self * other`, returning</span>
<span class="doccomment">/// [`None`] if overflow occurred.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`None`]: ../../std/option/enum.Option.html#variant.None</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::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Duration::new(0, 500_000_001).checked_mul(2), Some(Duration::new(1, 2)));</span>
<span class="doccomment">/// assert_eq!(Duration::new(std::u64::MAX - 1, 0).checked_mul(2), None);</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">"duration_checked_ops"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">checked_mul</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></span> {
<span class="comment">// Multiply nanoseconds as u64, because it cannot overflow that way.</span>
<span class="kw">let</span> <span class="ident">total_nanos</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">nanos</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">*</span> <span class="ident">rhs</span> <span class="kw">as</span> <span class="ident">u64</span>;
<span class="kw">let</span> <span class="ident">extra_secs</span> <span class="op">=</span> <span class="ident">total_nanos</span> <span class="op">/</span> (<span class="ident">NANOS_PER_SEC</span> <span class="kw">as</span> <span class="ident">u64</span>);
<span class="kw">let</span> <span class="ident">nanos</span> <span class="op">=</span> (<span class="ident">total_nanos</span> <span class="op">%</span> (<span class="ident">NANOS_PER_SEC</span> <span class="kw">as</span> <span class="ident">u64</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">Some</span>(<span class="ident">secs</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">secs</span>
.<span class="ident">checked_mul</span>(<span class="ident">rhs</span> <span class="kw">as</span> <span class="ident">u64</span>)
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">checked_add</span>(<span class="ident">extra_secs</span>)) {
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">nanos</span> <span class="op"><</span> <span class="ident">NANOS_PER_SEC</span>);
<span class="prelude-val">Some</span>(<span class="ident">Duration</span> {
<span class="ident">secs</span>,
<span class="ident">nanos</span>,
})
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
<span class="doccomment">/// Checked `Duration` division. Computes `self / other`, returning [`None`]</span>
<span class="doccomment">/// if `other == 0`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`None`]: ../../std/option/enum.Option.html#variant.None</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::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Duration::new(2, 0).checked_div(2), Some(Duration::new(1, 0)));</span>
<span class="doccomment">/// assert_eq!(Duration::new(1, 0).checked_div(2), Some(Duration::new(0, 500_000_000)));</span>
<span class="doccomment">/// assert_eq!(Duration::new(2, 0).checked_div(0), None);</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">"duration_checked_ops"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">checked_div</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">rhs</span> <span class="op">!=</span> <span class="number">0</span> {
<span class="kw">let</span> <span class="ident">secs</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">secs</span> <span class="op">/</span> (<span class="ident">rhs</span> <span class="kw">as</span> <span class="ident">u64</span>);
<span class="kw">let</span> <span class="ident">carry</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">secs</span> <span class="op">-</span> <span class="ident">secs</span> <span class="op">*</span> (<span class="ident">rhs</span> <span class="kw">as</span> <span class="ident">u64</span>);
<span class="kw">let</span> <span class="ident">extra_nanos</span> <span class="op">=</span> <span class="ident">carry</span> <span class="op">*</span> (<span class="ident">NANOS_PER_SEC</span> <span class="kw">as</span> <span class="ident">u64</span>) <span class="op">/</span> (<span class="ident">rhs</span> <span class="kw">as</span> <span class="ident">u64</span>);
<span class="kw">let</span> <span class="ident">nanos</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">nanos</span> <span class="op">/</span> <span class="ident">rhs</span> <span class="op">+</span> (<span class="ident">extra_nanos</span> <span class="kw">as</span> <span class="ident">u32</span>);
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">nanos</span> <span class="op"><</span> <span class="ident">NANOS_PER_SEC</span>);
<span class="prelude-val">Some</span>(<span class="ident">Duration</span> { <span class="ident">secs</span>: <span class="ident">secs</span>, <span class="ident">nanos</span>: <span class="ident">nanos</span> })
} <span class="kw">else</span> {
<span class="prelude-val">None</span>
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Add</span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;
<span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="self">self</span>.<span class="ident">checked_add</span>(<span class="ident">rhs</span>).<span class="ident">expect</span>(<span class="string">"overflow when adding durations"</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"time_augmented_assignment"</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="ident">AddAssign</span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">fn</span> <span class="ident">add_assign</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">Duration</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">+</span> <span class="ident">rhs</span>;
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Sub</span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;
<span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="self">self</span>.<span class="ident">checked_sub</span>(<span class="ident">rhs</span>).<span class="ident">expect</span>(<span class="string">"overflow when subtracting durations"</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"time_augmented_assignment"</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="ident">SubAssign</span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">fn</span> <span class="ident">sub_assign</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">Duration</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">-</span> <span class="ident">rhs</span>;
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Mul</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;
<span class="kw">fn</span> <span class="ident">mul</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="self">self</span>.<span class="ident">checked_mul</span>(<span class="ident">rhs</span>).<span class="ident">expect</span>(<span class="string">"overflow when multiplying duration by scalar"</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"time_augmented_assignment"</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="ident">MulAssign</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">fn</span> <span class="ident">mul_assign</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">*</span> <span class="ident">rhs</span>;
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.3.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Div</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;
<span class="kw">fn</span> <span class="ident">div</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="self">self</span>.<span class="ident">checked_div</span>(<span class="ident">rhs</span>).<span class="ident">expect</span>(<span class="string">"divide by zero error when dividing duration by scalar"</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"time_augmented_assignment"</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="ident">DivAssign</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">fn</span> <span class="ident">div_assign</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">rhs</span>: <span class="ident">u32</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">/</span> <span class="ident">rhs</span>;
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration_sum"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Sum</span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">fn</span> <span class="ident">sum</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">Duration</span><span class="op">>></span>(<span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="ident">iter</span>.<span class="ident">fold</span>(<span class="ident">Duration</span>::<span class="ident">new</span>(<span class="number">0</span>, <span class="number">0</span>), <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration_sum"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Sum</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Duration</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Duration</span> {
<span class="kw">fn</span> <span class="ident">sum</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Duration</span><span class="op">>></span>(<span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">Duration</span> {
<span class="ident">iter</span>.<span class="ident">fold</span>(<span class="ident">Duration</span>::<span class="ident">new</span>(<span class="number">0</span>, <span class="number">0</span>), <span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">+</span> <span class="kw-2">*</span><span class="ident">b</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"duration_debug_impl"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Duration</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">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="doccomment">/// Formats a floating point number in decimal notation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The number is given as the `integer_part` and a fractional part.</span>
<span class="doccomment">/// The value of the fractional part is `fractional_part / divisor`. So</span>
<span class="doccomment">/// `integer_part` = 3, `fractional_part` = 12 and `divisor` = 100</span>
<span class="doccomment">/// represents the number `3.012`. Trailing zeros are omitted.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `divisor` must not be above 100_000_000. It also should be a power</span>
<span class="doccomment">/// of 10, everything else doesn't make sense. `fractional_part` has</span>
<span class="doccomment">/// to be less than `10 * divisor`!</span>
<span class="kw">fn</span> <span class="ident">fmt_decimal</span>(
<span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>,
<span class="kw-2">mut</span> <span class="ident">integer_part</span>: <span class="ident">u64</span>,
<span class="kw-2">mut</span> <span class="ident">fractional_part</span>: <span class="ident">u32</span>,
<span class="kw-2">mut</span> <span class="ident">divisor</span>: <span class="ident">u32</span>,
) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="comment">// Encode the fractional part into a temporary buffer. The buffer</span>
<span class="comment">// only need to hold 9 elements, because `fractional_part` has to</span>
<span class="comment">// be smaller than 10^9. The buffer is prefilled with '0' digits</span>
<span class="comment">// to simplify the code below.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="string">b'0'</span>; <span class="number">9</span>];
<span class="comment">// The next digit is written at this position</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pos</span> <span class="op">=</span> <span class="number">0</span>;
<span class="comment">// We keep writing digits into the buffer while there are non-zero</span>
<span class="comment">// digits left and we haven't written enough digits yet.</span>
<span class="kw">while</span> <span class="ident">fractional_part</span> <span class="op">></span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">pos</span> <span class="op"><</span> <span class="ident">f</span>.<span class="ident">precision</span>().<span class="ident">unwrap_or</span>(<span class="number">9</span>) {
<span class="comment">// Write new digit into the buffer</span>
<span class="ident">buf</span>[<span class="ident">pos</span>] <span class="op">=</span> <span class="string">b'0'</span> <span class="op">+</span> (<span class="ident">fractional_part</span> <span class="op">/</span> <span class="ident">divisor</span>) <span class="kw">as</span> <span class="ident">u8</span>;
<span class="ident">fractional_part</span> <span class="op">%=</span> <span class="ident">divisor</span>;
<span class="ident">divisor</span> <span class="op">/=</span> <span class="number">10</span>;
<span class="ident">pos</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="comment">// If a precision < 9 was specified, there may be some non-zero</span>
<span class="comment">// digits left that weren't written into the buffer. In that case we</span>
<span class="comment">// need to perform rounding to match the semantics of printing</span>
<span class="comment">// normal floating point numbers. However, we only need to do work</span>
<span class="comment">// when rounding up. This happens if the first digit of the</span>
<span class="comment">// remaining ones is >= 5.</span>
<span class="kw">if</span> <span class="ident">fractional_part</span> <span class="op">></span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">fractional_part</span> <span class="op">>=</span> <span class="ident">divisor</span> <span class="op">*</span> <span class="number">5</span> {
<span class="comment">// Round up the number contained in the buffer. We go through</span>
<span class="comment">// the buffer backwards and keep track of the carry.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rev_pos</span> <span class="op">=</span> <span class="ident">pos</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">carry</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">while</span> <span class="ident">carry</span> <span class="op">&&</span> <span class="ident">rev_pos</span> <span class="op">></span> <span class="number">0</span> {
<span class="ident">rev_pos</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="comment">// If the digit in the buffer is not '9', we just need to</span>
<span class="comment">// increment it and can stop then (since we don't have a</span>
<span class="comment">// carry anymore). Otherwise, we set it to '0' (overflow)</span>
<span class="comment">// and continue.</span>
<span class="kw">if</span> <span class="ident">buf</span>[<span class="ident">rev_pos</span>] <span class="op"><</span> <span class="string">b'9'</span> {
<span class="ident">buf</span>[<span class="ident">rev_pos</span>] <span class="op">+=</span> <span class="number">1</span>;
<span class="ident">carry</span> <span class="op">=</span> <span class="bool-val">false</span>;
} <span class="kw">else</span> {
<span class="ident">buf</span>[<span class="ident">rev_pos</span>] <span class="op">=</span> <span class="string">b'0'</span>;
}
}
<span class="comment">// If we still have the carry bit set, that means that we set</span>
<span class="comment">// the whole buffer to '0's and need to increment the integer</span>
<span class="comment">// part.</span>
<span class="kw">if</span> <span class="ident">carry</span> {
<span class="ident">integer_part</span> <span class="op">+=</span> <span class="number">1</span>;
}
}
<span class="comment">// Determine the end of the buffer: if precision is set, we just</span>
<span class="comment">// use as many digits from the buffer (capped to 9). If it isn't</span>
<span class="comment">// set, we only use all digits up to the last non-zero one.</span>
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">precision</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> ::<span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">p</span>, <span class="number">9</span>)).<span class="ident">unwrap_or</span>(<span class="ident">pos</span>);
<span class="comment">// If we haven't emitted a single fractional digit and the precision</span>
<span class="comment">// wasn't set to a non-zero value, we don't print the decimal point.</span>
<span class="kw">if</span> <span class="ident">end</span> <span class="op">==</span> <span class="number">0</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{}"</span>, <span class="ident">integer_part</span>)
} <span class="kw">else</span> {
<span class="comment">// We are only writing ASCII digits into the buffer and it was</span>
<span class="comment">// initialized with '0's, so it contains valid UTF8.</span>
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">unsafe</span> {
::<span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..<span class="ident">end</span>])
};
<span class="comment">// If the user request a precision > 9, we pad '0's at the end.</span>
<span class="kw">let</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">precision</span>().<span class="ident">unwrap_or</span>(<span class="ident">pos</span>);
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{}.{:0<width$}"</span>, <span class="ident">integer_part</span>, <span class="ident">s</span>, <span class="ident">width</span> <span class="op">=</span> <span class="ident">w</span>)
}
}
<span class="comment">// Print leading '+' sign if requested</span>
<span class="kw">if</span> <span class="ident">f</span>.<span class="ident">sign_plus</span>() {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"+"</span>)<span class="question-mark">?</span>;
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">secs</span> <span class="op">></span> <span class="number">0</span> {
<span class="ident">fmt_decimal</span>(<span class="ident">f</span>, <span class="self">self</span>.<span class="ident">secs</span>, <span class="self">self</span>.<span class="ident">nanos</span>, <span class="number">100_000_000</span>)<span class="question-mark">?</span>;
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">"s"</span>)
} <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">nanos</span> <span class="op">>=</span> <span class="number">1_000_000</span> {
<span class="ident">fmt_decimal</span>(<span class="ident">f</span>, <span class="self">self</span>.<span class="ident">nanos</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">/</span> <span class="number">1_000_000</span>, <span class="self">self</span>.<span class="ident">nanos</span> <span class="op">%</span> <span class="number">1_000_000</span>, <span class="number">100_000</span>)<span class="question-mark">?</span>;
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">"ms"</span>)
} <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">nanos</span> <span class="op">>=</span> <span class="number">1_000</span> {
<span class="ident">fmt_decimal</span>(<span class="ident">f</span>, <span class="self">self</span>.<span class="ident">nanos</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">/</span> <span class="number">1_000</span>, <span class="self">self</span>.<span class="ident">nanos</span> <span class="op">%</span> <span class="number">1_000</span>, <span class="number">100</span>)<span class="question-mark">?</span>;
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">"µs"</span>)
} <span class="kw">else</span> {
<span class="ident">fmt_decimal</span>(<span class="ident">f</span>, <span class="self">self</span>.<span class="ident">nanos</span> <span class="kw">as</span> <span class="ident">u64</span>, <span class="number">0</span>, <span class="number">1</span>)<span class="question-mark">?</span>;
<span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">"ns"</span>)
}
}
}
</pre>
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