FenrirWolf
7 years ago
committed by
GitHub
9 changed files with 75 additions and 629 deletions
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// Copyright 2012-2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use iter::Sum; |
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use ops::{Add, Sub, Mul, Div, AddAssign, SubAssign, MulAssign, DivAssign}; |
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const NANOS_PER_SEC: u32 = 1_000_000_000; |
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const NANOS_PER_MILLI: u32 = 1_000_000; |
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const NANOS_PER_MICRO: u32 = 1_000; |
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const MILLIS_PER_SEC: u64 = 1_000; |
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const MICROS_PER_SEC: u64 = 1_000_000; |
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/// A `Duration` type to represent a span of time, typically used for system
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/// timeouts.
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///
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/// Each `Duration` is composed of a whole number of seconds and a fractional part
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/// represented in nanoseconds. If the underlying system does not support
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/// nanosecond-level precision, APIs binding a system timeout will typically round up
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/// the number of nanoseconds.
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///
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/// `Duration`s implement many common traits, including [`Add`], [`Sub`], and other
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/// [`ops`] traits.
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///
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/// [`Add`]: ../../std/ops/trait.Add.html
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/// [`Sub`]: ../../std/ops/trait.Sub.html
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/// [`ops`]: ../../std/ops/index.html
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let five_seconds = Duration::new(5, 0);
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/// let five_seconds_and_five_nanos = five_seconds + Duration::new(0, 5);
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///
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/// assert_eq!(five_seconds_and_five_nanos.as_secs(), 5);
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/// assert_eq!(five_seconds_and_five_nanos.subsec_nanos(), 5);
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///
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/// let ten_millis = Duration::from_millis(10);
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/// ```
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#[stable(feature = "duration", since = "1.3.0")] |
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#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug, Hash, Default)] |
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pub struct Duration { |
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secs: u64, |
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nanos: u32, // Always 0 <= nanos < NANOS_PER_SEC
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} |
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impl Duration { |
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/// Creates a new `Duration` from the specified number of whole seconds and
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/// additional nanoseconds.
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///
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/// If the number of nanoseconds is greater than 1 billion (the number of
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/// nanoseconds in a second), then it will carry over into the seconds provided.
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///
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/// # Panics
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///
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/// This constructor will panic if the carry from the nanoseconds overflows
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/// the seconds counter.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let five_seconds = Duration::new(5, 0);
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/// ```
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#[stable(feature = "duration", since = "1.3.0")] |
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#[inline] |
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pub fn new(secs: u64, nanos: u32) -> Duration { |
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let secs = secs.checked_add((nanos / NANOS_PER_SEC) as u64) |
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.expect("overflow in Duration::new"); |
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let nanos = nanos % NANOS_PER_SEC; |
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Duration { secs: secs, nanos: nanos } |
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} |
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/// Creates a new `Duration` from the specified number of whole seconds.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_secs(5);
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///
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/// assert_eq!(5, duration.as_secs());
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/// assert_eq!(0, duration.subsec_nanos());
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/// ```
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#[stable(feature = "duration", since = "1.3.0")] |
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#[inline] |
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pub fn from_secs(secs: u64) -> Duration { |
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Duration { secs: secs, nanos: 0 } |
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} |
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/// Creates a new `Duration` from the specified number of milliseconds.
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_millis(2569);
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///
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/// assert_eq!(2, duration.as_secs());
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/// assert_eq!(569_000_000, duration.subsec_nanos());
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/// ```
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#[stable(feature = "duration", since = "1.3.0")] |
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#[inline] |
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pub fn from_millis(millis: u64) -> Duration { |
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let secs = millis / MILLIS_PER_SEC; |
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let nanos = ((millis % MILLIS_PER_SEC) as u32) * NANOS_PER_MILLI; |
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Duration { secs: secs, nanos: nanos } |
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} |
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/// Creates a new `Duration` from the specified number of microseconds.
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///
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/// # Examples
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///
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/// ```
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/// #![feature(duration_from_micros)]
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_micros(1_000_002);
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///
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/// assert_eq!(1, duration.as_secs());
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/// assert_eq!(2000, duration.subsec_nanos());
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/// ```
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#[unstable(feature = "duration_from_micros", issue = "44400")] |
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#[inline] |
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pub fn from_micros(micros: u64) -> Duration { |
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let secs = micros / MICROS_PER_SEC; |
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let nanos = ((micros % MICROS_PER_SEC) as u32) * NANOS_PER_MICRO; |
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Duration { secs: secs, nanos: nanos } |
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} |
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/// Creates a new `Duration` from the specified number of nanoseconds.
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///
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/// # Examples
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///
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/// ```
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/// #![feature(duration_extras)]
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_nanos(1_000_000_123);
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///
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/// assert_eq!(1, duration.as_secs());
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/// assert_eq!(123, duration.subsec_nanos());
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/// ```
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#[unstable(feature = "duration_extras", issue = "46507")] |
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#[inline] |
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pub fn from_nanos(nanos: u64) -> Duration { |
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let secs = nanos / (NANOS_PER_SEC as u64); |
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let nanos = (nanos % (NANOS_PER_SEC as u64)) as u32; |
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Duration { secs: secs, nanos: nanos } |
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} |
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/// Returns the number of _whole_ seconds contained by this `Duration`.
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///
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/// The returned value does not include the fractional (nanosecond) part of the
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/// duration, which can be obtained using [`subsec_nanos`].
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::new(5, 730023852);
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/// assert_eq!(duration.as_secs(), 5);
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/// ```
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///
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/// To determine the total number of seconds represented by the `Duration`,
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/// use `as_secs` in combination with [`subsec_nanos`]:
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::new(5, 730023852);
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///
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/// assert_eq!(5.730023852,
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/// duration.as_secs() as f64
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/// + duration.subsec_nanos() as f64 * 1e-9);
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/// ```
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///
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/// [`subsec_nanos`]: #method.subsec_nanos
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#[stable(feature = "duration", since = "1.3.0")] |
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#[inline] |
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pub fn as_secs(&self) -> u64 { self.secs } |
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/// Returns the fractional part of this `Duration`, in milliseconds.
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///
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/// This method does **not** return the length of the duration when
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/// represented by milliseconds. The returned number always represents a
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/// fractional portion of a second (i.e. it is less than one thousand).
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///
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/// # Examples
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///
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/// ```
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/// #![feature(duration_extras)]
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_millis(5432);
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/// assert_eq!(duration.as_secs(), 5);
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/// assert_eq!(duration.subsec_millis(), 432);
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/// ```
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#[unstable(feature = "duration_extras", issue = "46507")] |
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#[inline] |
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pub fn subsec_millis(&self) -> u32 { self.nanos / NANOS_PER_MILLI } |
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/// Returns the fractional part of this `Duration`, in microseconds.
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///
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/// This method does **not** return the length of the duration when
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/// represented by microseconds. The returned number always represents a
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/// fractional portion of a second (i.e. it is less than one million).
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///
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/// # Examples
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///
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/// ```
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/// #![feature(duration_extras, duration_from_micros)]
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_micros(1_234_567);
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/// assert_eq!(duration.as_secs(), 1);
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/// assert_eq!(duration.subsec_micros(), 234_567);
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/// ```
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#[unstable(feature = "duration_extras", issue = "46507")] |
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#[inline] |
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pub fn subsec_micros(&self) -> u32 { self.nanos / NANOS_PER_MICRO } |
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/// Returns the fractional part of this `Duration`, in nanoseconds.
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///
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/// This method does **not** return the length of the duration when
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/// represented by nanoseconds. The returned number always represents a
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/// fractional portion of a second (i.e. it is less than one billion).
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///
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/// # Examples
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///
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/// ```
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/// use std::time::Duration;
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///
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/// let duration = Duration::from_millis(5010);
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/// assert_eq!(duration.as_secs(), 5);
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/// assert_eq!(duration.subsec_nanos(), 10_000_000);
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/// ```
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#[stable(feature = "duration", since = "1.3.0")] |
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#[inline] |
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pub fn subsec_nanos(&self) -> u32 { self.nanos } |
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/// Checked `Duration` addition. Computes `self + other`, returning [`None`]
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/// if overflow occurred.
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///
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/// [`None`]: ../../std/option/enum.Option.html#variant.None
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::new(0, 0).checked_add(Duration::new(0, 1)), Some(Duration::new(0, 1)));
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/// assert_eq!(Duration::new(1, 0).checked_add(Duration::new(std::u64::MAX, 0)), None);
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/// ```
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#[stable(feature = "duration_checked_ops", since = "1.16.0")] |
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#[inline] |
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pub fn checked_add(self, rhs: Duration) -> Option<Duration> { |
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if let Some(mut secs) = self.secs.checked_add(rhs.secs) { |
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let mut nanos = self.nanos + rhs.nanos; |
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if nanos >= NANOS_PER_SEC { |
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nanos -= NANOS_PER_SEC; |
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if let Some(new_secs) = secs.checked_add(1) { |
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secs = new_secs; |
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} else { |
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return None; |
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} |
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} |
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debug_assert!(nanos < NANOS_PER_SEC); |
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Some(Duration { |
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secs, |
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nanos, |
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}) |
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} else { |
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None |
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} |
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} |
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/// Checked `Duration` subtraction. Computes `self - other`, returning [`None`]
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/// if the result would be negative or if overflow occurred.
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///
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/// [`None`]: ../../std/option/enum.Option.html#variant.None
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::new(0, 1).checked_sub(Duration::new(0, 0)), Some(Duration::new(0, 1)));
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/// assert_eq!(Duration::new(0, 0).checked_sub(Duration::new(0, 1)), None);
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/// ```
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#[stable(feature = "duration_checked_ops", since = "1.16.0")] |
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#[inline] |
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pub fn checked_sub(self, rhs: Duration) -> Option<Duration> { |
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if let Some(mut secs) = self.secs.checked_sub(rhs.secs) { |
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let nanos = if self.nanos >= rhs.nanos { |
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self.nanos - rhs.nanos |
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} else { |
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if let Some(sub_secs) = secs.checked_sub(1) { |
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secs = sub_secs; |
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self.nanos + NANOS_PER_SEC - rhs.nanos |
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} else { |
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return None; |
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} |
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}; |
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debug_assert!(nanos < NANOS_PER_SEC); |
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Some(Duration { secs: secs, nanos: nanos }) |
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} else { |
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None |
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} |
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} |
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/// Checked `Duration` multiplication. Computes `self * other`, returning
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/// [`None`] if overflow occurred.
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///
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/// [`None`]: ../../std/option/enum.Option.html#variant.None
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::new(0, 500_000_001).checked_mul(2), Some(Duration::new(1, 2)));
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/// assert_eq!(Duration::new(std::u64::MAX - 1, 0).checked_mul(2), None);
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/// ```
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#[stable(feature = "duration_checked_ops", since = "1.16.0")] |
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#[inline] |
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pub fn checked_mul(self, rhs: u32) -> Option<Duration> { |
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// Multiply nanoseconds as u64, because it cannot overflow that way.
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let total_nanos = self.nanos as u64 * rhs as u64; |
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let extra_secs = total_nanos / (NANOS_PER_SEC as u64); |
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let nanos = (total_nanos % (NANOS_PER_SEC as u64)) as u32; |
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if let Some(secs) = self.secs |
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.checked_mul(rhs as u64) |
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.and_then(|s| s.checked_add(extra_secs)) { |
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debug_assert!(nanos < NANOS_PER_SEC); |
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Some(Duration { |
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secs, |
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nanos, |
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}) |
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} else { |
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None |
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} |
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} |
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/// Checked `Duration` division. Computes `self / other`, returning [`None`]
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/// if `other == 0`.
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///
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/// [`None`]: ../../std/option/enum.Option.html#variant.None
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///
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/// # Examples
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///
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/// Basic usage:
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///
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/// ```
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/// use std::time::Duration;
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///
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/// assert_eq!(Duration::new(2, 0).checked_div(2), Some(Duration::new(1, 0)));
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/// assert_eq!(Duration::new(1, 0).checked_div(2), Some(Duration::new(0, 500_000_000)));
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/// assert_eq!(Duration::new(2, 0).checked_div(0), None);
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/// ```
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#[stable(feature = "duration_checked_ops", since = "1.16.0")] |
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#[inline] |
|
||||||
pub fn checked_div(self, rhs: u32) -> Option<Duration> { |
|
||||||
if rhs != 0 { |
|
||||||
let secs = self.secs / (rhs as u64); |
|
||||||
let carry = self.secs - secs * (rhs as u64); |
|
||||||
let extra_nanos = carry * (NANOS_PER_SEC as u64) / (rhs as u64); |
|
||||||
let nanos = self.nanos / rhs + (extra_nanos as u32); |
|
||||||
debug_assert!(nanos < NANOS_PER_SEC); |
|
||||||
Some(Duration { secs: secs, nanos: nanos }) |
|
||||||
} else { |
|
||||||
None |
|
||||||
} |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "duration", since = "1.3.0")] |
|
||||||
impl Add for Duration { |
|
||||||
type Output = Duration; |
|
||||||
|
|
||||||
fn add(self, rhs: Duration) -> Duration { |
|
||||||
self.checked_add(rhs).expect("overflow when adding durations") |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "time_augmented_assignment", since = "1.9.0")] |
|
||||||
impl AddAssign for Duration { |
|
||||||
fn add_assign(&mut self, rhs: Duration) { |
|
||||||
*self = *self + rhs; |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "duration", since = "1.3.0")] |
|
||||||
impl Sub for Duration { |
|
||||||
type Output = Duration; |
|
||||||
|
|
||||||
fn sub(self, rhs: Duration) -> Duration { |
|
||||||
self.checked_sub(rhs).expect("overflow when subtracting durations") |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "time_augmented_assignment", since = "1.9.0")] |
|
||||||
impl SubAssign for Duration { |
|
||||||
fn sub_assign(&mut self, rhs: Duration) { |
|
||||||
*self = *self - rhs; |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "duration", since = "1.3.0")] |
|
||||||
impl Mul<u32> for Duration { |
|
||||||
type Output = Duration; |
|
||||||
|
|
||||||
fn mul(self, rhs: u32) -> Duration { |
|
||||||
self.checked_mul(rhs).expect("overflow when multiplying duration by scalar") |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "time_augmented_assignment", since = "1.9.0")] |
|
||||||
impl MulAssign<u32> for Duration { |
|
||||||
fn mul_assign(&mut self, rhs: u32) { |
|
||||||
*self = *self * rhs; |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "duration", since = "1.3.0")] |
|
||||||
impl Div<u32> for Duration { |
|
||||||
type Output = Duration; |
|
||||||
|
|
||||||
fn div(self, rhs: u32) -> Duration { |
|
||||||
self.checked_div(rhs).expect("divide by zero error when dividing duration by scalar") |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "time_augmented_assignment", since = "1.9.0")] |
|
||||||
impl DivAssign<u32> for Duration { |
|
||||||
fn div_assign(&mut self, rhs: u32) { |
|
||||||
*self = *self / rhs; |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "duration_sum", since = "1.16.0")] |
|
||||||
impl Sum for Duration { |
|
||||||
fn sum<I: Iterator<Item=Duration>>(iter: I) -> Duration { |
|
||||||
iter.fold(Duration::new(0, 0), |a, b| a + b) |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[stable(feature = "duration_sum", since = "1.16.0")] |
|
||||||
impl<'a> Sum<&'a Duration> for Duration { |
|
||||||
fn sum<I: Iterator<Item=&'a Duration>>(iter: I) -> Duration { |
|
||||||
iter.fold(Duration::new(0, 0), |a, b| a + *b) |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
#[cfg(test)] |
|
||||||
mod tests { |
|
||||||
use super::Duration; |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn creation() { |
|
||||||
assert!(Duration::from_secs(1) != Duration::from_secs(0)); |
|
||||||
assert_eq!(Duration::from_secs(1) + Duration::from_secs(2), |
|
||||||
Duration::from_secs(3)); |
|
||||||
assert_eq!(Duration::from_millis(10) + Duration::from_secs(4), |
|
||||||
Duration::new(4, 10 * 1_000_000)); |
|
||||||
assert_eq!(Duration::from_millis(4000), Duration::new(4, 0)); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn secs() { |
|
||||||
assert_eq!(Duration::new(0, 0).as_secs(), 0); |
|
||||||
assert_eq!(Duration::from_secs(1).as_secs(), 1); |
|
||||||
assert_eq!(Duration::from_millis(999).as_secs(), 0); |
|
||||||
assert_eq!(Duration::from_millis(1001).as_secs(), 1); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn nanos() { |
|
||||||
assert_eq!(Duration::new(0, 0).subsec_nanos(), 0); |
|
||||||
assert_eq!(Duration::new(0, 5).subsec_nanos(), 5); |
|
||||||
assert_eq!(Duration::new(0, 1_000_000_001).subsec_nanos(), 1); |
|
||||||
assert_eq!(Duration::from_secs(1).subsec_nanos(), 0); |
|
||||||
assert_eq!(Duration::from_millis(999).subsec_nanos(), 999 * 1_000_000); |
|
||||||
assert_eq!(Duration::from_millis(1001).subsec_nanos(), 1 * 1_000_000); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn add() { |
|
||||||
assert_eq!(Duration::new(0, 0) + Duration::new(0, 1), |
|
||||||
Duration::new(0, 1)); |
|
||||||
assert_eq!(Duration::new(0, 500_000_000) + Duration::new(0, 500_000_001), |
|
||||||
Duration::new(1, 1)); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn checked_add() { |
|
||||||
assert_eq!(Duration::new(0, 0).checked_add(Duration::new(0, 1)), |
|
||||||
Some(Duration::new(0, 1))); |
|
||||||
assert_eq!(Duration::new(0, 500_000_000).checked_add(Duration::new(0, 500_000_001)), |
|
||||||
Some(Duration::new(1, 1))); |
|
||||||
assert_eq!(Duration::new(1, 0).checked_add(Duration::new(::u64::MAX, 0)), None); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn sub() { |
|
||||||
assert_eq!(Duration::new(0, 1) - Duration::new(0, 0), |
|
||||||
Duration::new(0, 1)); |
|
||||||
assert_eq!(Duration::new(0, 500_000_001) - Duration::new(0, 500_000_000), |
|
||||||
Duration::new(0, 1)); |
|
||||||
assert_eq!(Duration::new(1, 0) - Duration::new(0, 1), |
|
||||||
Duration::new(0, 999_999_999)); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn checked_sub() { |
|
||||||
let zero = Duration::new(0, 0); |
|
||||||
let one_nano = Duration::new(0, 1); |
|
||||||
let one_sec = Duration::new(1, 0); |
|
||||||
assert_eq!(one_nano.checked_sub(zero), Some(Duration::new(0, 1))); |
|
||||||
assert_eq!(one_sec.checked_sub(one_nano), |
|
||||||
Some(Duration::new(0, 999_999_999))); |
|
||||||
assert_eq!(zero.checked_sub(one_nano), None); |
|
||||||
assert_eq!(zero.checked_sub(one_sec), None); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] #[should_panic] |
|
||||||
fn sub_bad1() { |
|
||||||
Duration::new(0, 0) - Duration::new(0, 1); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] #[should_panic] |
|
||||||
fn sub_bad2() { |
|
||||||
Duration::new(0, 0) - Duration::new(1, 0); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn mul() { |
|
||||||
assert_eq!(Duration::new(0, 1) * 2, Duration::new(0, 2)); |
|
||||||
assert_eq!(Duration::new(1, 1) * 3, Duration::new(3, 3)); |
|
||||||
assert_eq!(Duration::new(0, 500_000_001) * 4, Duration::new(2, 4)); |
|
||||||
assert_eq!(Duration::new(0, 500_000_001) * 4000, |
|
||||||
Duration::new(2000, 4000)); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn checked_mul() { |
|
||||||
assert_eq!(Duration::new(0, 1).checked_mul(2), Some(Duration::new(0, 2))); |
|
||||||
assert_eq!(Duration::new(1, 1).checked_mul(3), Some(Duration::new(3, 3))); |
|
||||||
assert_eq!(Duration::new(0, 500_000_001).checked_mul(4), Some(Duration::new(2, 4))); |
|
||||||
assert_eq!(Duration::new(0, 500_000_001).checked_mul(4000), |
|
||||||
Some(Duration::new(2000, 4000))); |
|
||||||
assert_eq!(Duration::new(::u64::MAX - 1, 0).checked_mul(2), None); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn div() { |
|
||||||
assert_eq!(Duration::new(0, 1) / 2, Duration::new(0, 0)); |
|
||||||
assert_eq!(Duration::new(1, 1) / 3, Duration::new(0, 333_333_333)); |
|
||||||
assert_eq!(Duration::new(99, 999_999_000) / 100, |
|
||||||
Duration::new(0, 999_999_990)); |
|
||||||
} |
|
||||||
|
|
||||||
#[test] |
|
||||||
fn checked_div() { |
|
||||||
assert_eq!(Duration::new(2, 0).checked_div(2), Some(Duration::new(1, 0))); |
|
||||||
assert_eq!(Duration::new(1, 0).checked_div(2), Some(Duration::new(0, 500_000_000))); |
|
||||||
assert_eq!(Duration::new(2, 0).checked_div(0), None); |
|
||||||
} |
|
||||||
} |
|
||||||
Loading…
Reference in new issue