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Auto merge of #47300 - remexre:duration-constructors-as-const-fns, r=alexcrichton

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Makes the constructors of Duration const fns.

This affects `Duration::new`, `Duration::from_secs`, `Duration::from_millis`, `Duration::from_micros`, and `Duration::from_nanos`.
This commit is contained in:
bors 2018-01-24 10:39:25 +00:00
commit a0dcecff90
1 changed files with 16 additions and 13 deletions
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29
src/libstd/time/duration.rs
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@ -94,7 +94,7 @@ impl Duration {
/// ```
#[stable(feature = "duration", since = "1.3.0")]
#[inline]
pub fn from_secs(secs: u64) -> Duration {
pub const fn from_secs(secs: u64) -> Duration {
Duration { secs: secs, nanos: 0 }
}
@ -112,10 +112,11 @@ impl Duration {
/// ```
#[stable(feature = "duration", since = "1.3.0")]
#[inline]
pub fn from_millis(millis: u64) -> Duration {
let secs = millis / MILLIS_PER_SEC;
let nanos = ((millis % MILLIS_PER_SEC) as u32) * NANOS_PER_MILLI;
Duration { secs: secs, nanos: nanos }
pub const fn from_millis(millis: u64) -> Duration {
Duration {
secs: millis / MILLIS_PER_SEC,
nanos: ((millis % MILLIS_PER_SEC) as u32) * NANOS_PER_MILLI,
}
}
/// Creates a new `Duration` from the specified number of microseconds.
@ -133,10 +134,11 @@ impl Duration {
/// ```
#[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 }
pub const fn from_micros(micros: u64) -> Duration {
Duration {
secs: micros / MICROS_PER_SEC,
nanos: ((micros % MICROS_PER_SEC) as u32) * NANOS_PER_MICRO,
}
}
/// Creates a new `Duration` from the specified number of nanoseconds.
@ -154,10 +156,11 @@ impl Duration {
/// ```
#[unstable(feature = "duration_extras", issue = "46507")]
#[inline]
pub fn from_nanos(nanos: u64) -> Duration {
let secs = nanos / (NANOS_PER_SEC as u64);
let nanos = (nanos % (NANOS_PER_SEC as u64)) as u32;
Duration { secs: secs, nanos: nanos }
pub const fn from_nanos(nanos: u64) -> Duration {
Duration {
secs: nanos / (NANOS_PER_SEC as u64),
nanos: (nanos % (NANOS_PER_SEC as u64)) as u32,
}
}
/// Returns the number of _whole_ seconds contained by this `Duration`.