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Auto merge of #44436 - MicroJoe:master, r=alexcrichton

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Add Duration::from_micros

This fixes #44400 that explains why it could be useful for embedded designs timing.
This commit is contained in:
bors 2017-09-23 22:21:32 +00:00
commit 24831c7221
1 changed files with 23 additions and 0 deletions
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23
src/libstd/time/duration.rs
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@ -13,7 +13,9 @@ use ops::{Add, Sub, Mul, Div, AddAssign, SubAssign, MulAssign, DivAssign};
const NANOS_PER_SEC: u32 = 1_000_000_000;
const NANOS_PER_MILLI: u32 = 1_000_000;
const NANOS_PER_MICRO: u32 = 1_000;
const MILLIS_PER_SEC: u64 = 1_000;
const MICROS_PER_SEC: u64 = 1_000_000;
/// A `Duration` type to represent a span of time, typically used for system
/// timeouts.
@ -116,6 +118,27 @@ impl Duration {
Duration { secs: secs, nanos: nanos }
}
/// Creates a new `Duration` from the specified number of microseconds.
///
/// # Examples
///
/// ```
/// #![feature(duration_from_micros)]
/// use std::time::Duration;
///
/// let duration = Duration::from_micros(1_000_002);
///
/// assert_eq!(1, duration.as_secs());
/// assert_eq!(2000, duration.subsec_nanos());
/// ```
#[unstable(feature = "duration_from_micros", issue = "44400")]
#[inline]
pub fn from_micros(micros: u64) -> Duration {
let secs = micros / MICROS_PER_SEC;
let nanos = ((micros % MICROS_PER_SEC) as u32) * NANOS_PER_MICRO;
Duration { secs: secs, nanos: nanos }
}
/// Returns the number of _whole_ seconds contained by this `Duration`.
///
/// The returned value does not include the fractional (nanosecond) part of the