pub struct Duration { /* private fields */ }
Expand description
A Duration
type to represent a span of time, typically used for system
timeouts.
Each Duration
is composed of a whole number of seconds and a fractional part
represented in nanoseconds. If the underlying system does not support
nanosecond-level precision, APIs binding a system timeout will typically round up
the number of nanoseconds.
Duration
s implement many common traits, including Add
, Sub
, and other
ops
traits. It implements Default
by returning a zero-length Duration
.
§Examples
use std::time::Duration;
let five_seconds = Duration::new(5, 0);
let five_seconds_and_five_nanos = five_seconds + Duration::new(0, 5);
assert_eq!(five_seconds_and_five_nanos.as_secs(), 5);
assert_eq!(five_seconds_and_five_nanos.subsec_nanos(), 5);
let ten_millis = Duration::from_millis(10);
§Formatting Duration
values
Duration
intentionally does not have a Display
impl, as there are a
variety of ways to format spans of time for human readability. Duration
provides a Debug
impl that shows the full precision of the value.
The Debug
output uses the non-ASCII “µs” suffix for microseconds. If your
program output may appear in contexts that cannot rely on full Unicode
compatibility, you may wish to format Duration
objects yourself or use a
crate to do so.
Implementations§
Source§impl Duration
impl Duration
Sourcepub const SECOND: Duration = _
🔬This is a nightly-only experimental API. (duration_constants
)
pub const SECOND: Duration = _
duration_constants
)The duration of one second.
§Examples
#![feature(duration_constants)]
use std::time::Duration;
assert_eq!(Duration::SECOND, Duration::from_secs(1));
Sourcepub const MILLISECOND: Duration = _
🔬This is a nightly-only experimental API. (duration_constants
)
pub const MILLISECOND: Duration = _
duration_constants
)The duration of one millisecond.
§Examples
#![feature(duration_constants)]
use std::time::Duration;
assert_eq!(Duration::MILLISECOND, Duration::from_millis(1));
Sourcepub const MICROSECOND: Duration = _
🔬This is a nightly-only experimental API. (duration_constants
)
pub const MICROSECOND: Duration = _
duration_constants
)The duration of one microsecond.
§Examples
#![feature(duration_constants)]
use std::time::Duration;
assert_eq!(Duration::MICROSECOND, Duration::from_micros(1));
Sourcepub const NANOSECOND: Duration = _
🔬This is a nightly-only experimental API. (duration_constants
)
pub const NANOSECOND: Duration = _
duration_constants
)The duration of one nanosecond.
§Examples
#![feature(duration_constants)]
use std::time::Duration;
assert_eq!(Duration::NANOSECOND, Duration::from_nanos(1));
1.53.0 · Sourcepub const ZERO: Duration = _
pub const ZERO: Duration = _
A duration of zero time.
§Examples
use std::time::Duration;
let duration = Duration::ZERO;
assert!(duration.is_zero());
assert_eq!(duration.as_nanos(), 0);
1.53.0 · Sourcepub const MAX: Duration = _
pub const MAX: Duration = _
The maximum duration.
May vary by platform as necessary. Must be able to contain the difference between
two instances of Instant
or two instances of SystemTime
.
This constraint gives it a value of about 584,942,417,355 years in practice,
which is currently used on all platforms.
§Examples
use std::time::Duration;
assert_eq!(Duration::MAX, Duration::new(u64::MAX, 1_000_000_000 - 1));
1.3.0 (const: 1.58.0) · Sourcepub const fn new(secs: u64, nanos: u32) -> Duration
pub const fn new(secs: u64, nanos: u32) -> Duration
Creates a new Duration
from the specified number of whole seconds and
additional nanoseconds.
If the number of nanoseconds is greater than 1 billion (the number of nanoseconds in a second), then it will carry over into the seconds provided.
§Panics
This constructor will panic if the carry from the nanoseconds overflows the seconds counter.
§Examples
use std::time::Duration;
let five_seconds = Duration::new(5, 0);
1.3.0 (const: 1.32.0) · Sourcepub const fn from_secs(secs: u64) -> Duration
pub const fn from_secs(secs: u64) -> Duration
Creates a new Duration
from the specified number of whole seconds.
§Examples
use std::time::Duration;
let duration = Duration::from_secs(5);
assert_eq!(5, duration.as_secs());
assert_eq!(0, duration.subsec_nanos());
1.3.0 (const: 1.32.0) · Sourcepub const fn from_millis(millis: u64) -> Duration
pub const fn from_millis(millis: u64) -> Duration
Creates a new Duration
from the specified number of milliseconds.
§Examples
use std::time::Duration;
let duration = Duration::from_millis(2_569);
assert_eq!(2, duration.as_secs());
assert_eq!(569_000_000, duration.subsec_nanos());
1.27.0 (const: 1.32.0) · Sourcepub const fn from_micros(micros: u64) -> Duration
pub const fn from_micros(micros: u64) -> Duration
Creates a new Duration
from the specified number of microseconds.
§Examples
use std::time::Duration;
let duration = Duration::from_micros(1_000_002);
assert_eq!(1, duration.as_secs());
assert_eq!(2_000, duration.subsec_nanos());
1.27.0 (const: 1.32.0) · Sourcepub const fn from_nanos(nanos: u64) -> Duration
pub const fn from_nanos(nanos: u64) -> Duration
Creates a new Duration
from the specified number of nanoseconds.
Note: Using this on the return value of as_nanos()
might cause unexpected behavior:
as_nanos()
returns a u128, and can return values that do not fit in u64, e.g. 585 years.
Instead, consider using the pattern Duration::new(d.as_secs(), d.subsec_nanos())
if you cannot copy/clone the Duration directly.
§Examples
use std::time::Duration;
let duration = Duration::from_nanos(1_000_000_123);
assert_eq!(1, duration.as_secs());
assert_eq!(123, duration.subsec_nanos());
Sourcepub const fn from_weeks(weeks: u64) -> Duration
🔬This is a nightly-only experimental API. (duration_constructors
)
pub const fn from_weeks(weeks: u64) -> Duration
duration_constructors
)Creates a new Duration
from the specified number of weeks.
§Panics
Panics if the given number of weeks overflows the Duration
size.
§Examples
#![feature(duration_constructors)]
use std::time::Duration;
let duration = Duration::from_weeks(4);
assert_eq!(4 * 7 * 24 * 60 * 60, duration.as_secs());
assert_eq!(0, duration.subsec_nanos());
Sourcepub const fn from_days(days: u64) -> Duration
🔬This is a nightly-only experimental API. (duration_constructors
)
pub const fn from_days(days: u64) -> Duration
duration_constructors
)Creates a new Duration
from the specified number of days.
§Panics
Panics if the given number of days overflows the Duration
size.
§Examples
#![feature(duration_constructors)]
use std::time::Duration;
let duration = Duration::from_days(7);
assert_eq!(7 * 24 * 60 * 60, duration.as_secs());
assert_eq!(0, duration.subsec_nanos());
Sourcepub const fn from_hours(hours: u64) -> Duration
🔬This is a nightly-only experimental API. (duration_constructors
)
pub const fn from_hours(hours: u64) -> Duration
duration_constructors
)Creates a new Duration
from the specified number of hours.
§Panics
Panics if the given number of hours overflows the Duration
size.
§Examples
#![feature(duration_constructors)]
use std::time::Duration;
let duration = Duration::from_hours(6);
assert_eq!(6 * 60 * 60, duration.as_secs());
assert_eq!(0, duration.subsec_nanos());
Sourcepub const fn from_mins(mins: u64) -> Duration
🔬This is a nightly-only experimental API. (duration_constructors
)
pub const fn from_mins(mins: u64) -> Duration
duration_constructors
)Creates a new Duration
from the specified number of minutes.
§Panics
Panics if the given number of minutes overflows the Duration
size.
§Examples
#![feature(duration_constructors)]
use std::time::Duration;
let duration = Duration::from_mins(10);
assert_eq!(10 * 60, duration.as_secs());
assert_eq!(0, duration.subsec_nanos());
1.53.0 (const: 1.53.0) · Sourcepub const fn is_zero(&self) -> bool
pub const fn is_zero(&self) -> bool
Returns true if this Duration
spans no time.
§Examples
use std::time::Duration;
assert!(Duration::ZERO.is_zero());
assert!(Duration::new(0, 0).is_zero());
assert!(Duration::from_nanos(0).is_zero());
assert!(Duration::from_secs(0).is_zero());
assert!(!Duration::new(1, 1).is_zero());
assert!(!Duration::from_nanos(1).is_zero());
assert!(!Duration::from_secs(1).is_zero());
1.3.0 (const: 1.32.0) · Sourcepub const fn as_secs(&self) -> u64
pub const fn as_secs(&self) -> u64
Returns the number of whole seconds contained by this Duration
.
The returned value does not include the fractional (nanosecond) part of the
duration, which can be obtained using subsec_nanos
.
§Examples
use std::time::Duration;
let duration = Duration::new(5, 730_023_852);
assert_eq!(duration.as_secs(), 5);
To determine the total number of seconds represented by the Duration
including the fractional part, use as_secs_f64
or as_secs_f32
1.27.0 (const: 1.32.0) · Sourcepub const fn subsec_millis(&self) -> u32
pub const fn subsec_millis(&self) -> u32
Returns the fractional part of this Duration
, in whole milliseconds.
This method does not return the length of the duration when represented by milliseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one thousand).
§Examples
use std::time::Duration;
let duration = Duration::from_millis(5_432);
assert_eq!(duration.as_secs(), 5);
assert_eq!(duration.subsec_millis(), 432);
1.27.0 (const: 1.32.0) · Sourcepub const fn subsec_micros(&self) -> u32
pub const fn subsec_micros(&self) -> u32
Returns the fractional part of this Duration
, in whole microseconds.
This method does not return the length of the duration when represented by microseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one million).
§Examples
use std::time::Duration;
let duration = Duration::from_micros(1_234_567);
assert_eq!(duration.as_secs(), 1);
assert_eq!(duration.subsec_micros(), 234_567);
1.3.0 (const: 1.32.0) · Sourcepub const fn subsec_nanos(&self) -> u32
pub const fn subsec_nanos(&self) -> u32
Returns the fractional part of this Duration
, in nanoseconds.
This method does not return the length of the duration when represented by nanoseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one billion).
§Examples
use std::time::Duration;
let duration = Duration::from_millis(5_010);
assert_eq!(duration.as_secs(), 5);
assert_eq!(duration.subsec_nanos(), 10_000_000);
1.33.0 (const: 1.33.0) · Sourcepub const fn as_millis(&self) -> u128
pub const fn as_millis(&self) -> u128
Returns the total number of whole milliseconds contained by this Duration
.
§Examples
use std::time::Duration;
let duration = Duration::new(5, 730_023_852);
assert_eq!(duration.as_millis(), 5_730);
1.33.0 (const: 1.33.0) · Sourcepub const fn as_micros(&self) -> u128
pub const fn as_micros(&self) -> u128
Returns the total number of whole microseconds contained by this Duration
.
§Examples
use std::time::Duration;
let duration = Duration::new(5, 730_023_852);
assert_eq!(duration.as_micros(), 5_730_023);
1.33.0 (const: 1.33.0) · Sourcepub const fn as_nanos(&self) -> u128
pub const fn as_nanos(&self) -> u128
Returns the total number of nanoseconds contained by this Duration
.
§Examples
use std::time::Duration;
let duration = Duration::new(5, 730_023_852);
assert_eq!(duration.as_nanos(), 5_730_023_852);
1.81.0 (const: 1.81.0) · Sourcepub const fn abs_diff(self, other: Duration) -> Duration
pub const fn abs_diff(self, other: Duration) -> Duration
Computes the absolute difference between self
and other
.
§Examples
use std::time::Duration;
assert_eq!(Duration::new(100, 0).abs_diff(Duration::new(80, 0)), Duration::new(20, 0));
assert_eq!(Duration::new(100, 400_000_000).abs_diff(Duration::new(110, 0)), Duration::new(9, 600_000_000));
1.16.0 (const: 1.58.0) · Sourcepub const fn checked_add(self, rhs: Duration) -> Option<Duration>
pub const fn checked_add(self, rhs: Duration) -> Option<Duration>
1.53.0 (const: 1.58.0) · Sourcepub const fn saturating_add(self, rhs: Duration) -> Duration
pub const fn saturating_add(self, rhs: Duration) -> Duration
Saturating Duration
addition. Computes self + other
, returning Duration::MAX
if overflow occurred.
§Examples
#![feature(duration_constants)]
use std::time::Duration;
assert_eq!(Duration::new(0, 0).saturating_add(Duration::new(0, 1)), Duration::new(0, 1));
assert_eq!(Duration::new(1, 0).saturating_add(Duration::new(u64::MAX, 0)), Duration::MAX);
1.16.0 (const: 1.58.0) · Sourcepub const fn checked_sub(self, rhs: Duration) -> Option<Duration>
pub const fn checked_sub(self, rhs: Duration) -> Option<Duration>
Checked Duration
subtraction. Computes self - other
, returning None
if the result would be negative or if overflow occurred.
§Examples
use std::time::Duration;
assert_eq!(Duration::new(0, 1).checked_sub(Duration::new(0, 0)), Some(Duration::new(0, 1)));
assert_eq!(Duration::new(0, 0).checked_sub(Duration::new(0, 1)), None);
1.53.0 (const: 1.58.0) · Sourcepub const fn saturating_sub(self, rhs: Duration) -> Duration
pub const fn saturating_sub(self, rhs: Duration) -> Duration
Saturating Duration
subtraction. Computes self - other
, returning Duration::ZERO
if the result would be negative or if overflow occurred.
§Examples
use std::time::Duration;
assert_eq!(Duration::new(0, 1).saturating_sub(Duration::new(0, 0)), Duration::new(0, 1));
assert_eq!(Duration::new(0, 0).saturating_sub(Duration::new(0, 1)), Duration::ZERO);
1.16.0 (const: 1.58.0) · Sourcepub const fn checked_mul(self, rhs: u32) -> Option<Duration>
pub const fn checked_mul(self, rhs: u32) -> Option<Duration>
1.53.0 (const: 1.58.0) · Sourcepub const fn saturating_mul(self, rhs: u32) -> Duration
pub const fn saturating_mul(self, rhs: u32) -> Duration
Saturating Duration
multiplication. Computes self * other
, returning
Duration::MAX
if overflow occurred.
§Examples
#![feature(duration_constants)]
use std::time::Duration;
assert_eq!(Duration::new(0, 500_000_001).saturating_mul(2), Duration::new(1, 2));
assert_eq!(Duration::new(u64::MAX - 1, 0).saturating_mul(2), Duration::MAX);
1.16.0 (const: 1.58.0) · Sourcepub const fn checked_div(self, rhs: u32) -> Option<Duration>
pub const fn checked_div(self, rhs: u32) -> Option<Duration>
Checked Duration
division. Computes self / other
, returning None
if other == 0
.
§Examples
use std::time::Duration;
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);
1.38.0 (const: 1.83.0) · Sourcepub const fn as_secs_f64(&self) -> f64
pub const fn as_secs_f64(&self) -> f64
Returns the number of seconds contained by this Duration
as f64
.
The returned value includes the fractional (nanosecond) part of the duration.
§Examples
use std::time::Duration;
let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.as_secs_f64(), 2.7);
1.38.0 (const: 1.83.0) · Sourcepub const fn as_secs_f32(&self) -> f32
pub const fn as_secs_f32(&self) -> f32
Returns the number of seconds contained by this Duration
as f32
.
The returned value includes the fractional (nanosecond) part of the duration.
§Examples
use std::time::Duration;
let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.as_secs_f32(), 2.7);
Sourcepub const fn as_millis_f64(&self) -> f64
🔬This is a nightly-only experimental API. (duration_millis_float
)
pub const fn as_millis_f64(&self) -> f64
duration_millis_float
)Returns the number of milliseconds contained by this Duration
as f64
.
The returned value includes the fractional (nanosecond) part of the duration.
§Examples
#![feature(duration_millis_float)]
use std::time::Duration;
let dur = Duration::new(2, 345_678_000);
assert_eq!(dur.as_millis_f64(), 2_345.678);
Sourcepub const fn as_millis_f32(&self) -> f32
🔬This is a nightly-only experimental API. (duration_millis_float
)
pub const fn as_millis_f32(&self) -> f32
duration_millis_float
)Returns the number of milliseconds contained by this Duration
as f32
.
The returned value includes the fractional (nanosecond) part of the duration.
§Examples
#![feature(duration_millis_float)]
use std::time::Duration;
let dur = Duration::new(2, 345_678_000);
assert_eq!(dur.as_millis_f32(), 2_345.678);
1.38.0 · Sourcepub fn from_secs_f64(secs: f64) -> Duration
pub fn from_secs_f64(secs: f64) -> Duration
Creates a new Duration
from the specified number of seconds represented
as f64
.
§Panics
This constructor will panic if secs
is negative, overflows Duration
or not finite.
§Examples
use std::time::Duration;
let res = Duration::from_secs_f64(0.0);
assert_eq!(res, Duration::new(0, 0));
let res = Duration::from_secs_f64(1e-20);
assert_eq!(res, Duration::new(0, 0));
let res = Duration::from_secs_f64(4.2e-7);
assert_eq!(res, Duration::new(0, 420));
let res = Duration::from_secs_f64(2.7);
assert_eq!(res, Duration::new(2, 700_000_000));
let res = Duration::from_secs_f64(3e10);
assert_eq!(res, Duration::new(30_000_000_000, 0));
// subnormal float
let res = Duration::from_secs_f64(f64::from_bits(1));
assert_eq!(res, Duration::new(0, 0));
// conversion uses rounding
let res = Duration::from_secs_f64(0.999e-9);
assert_eq!(res, Duration::new(0, 1));
1.38.0 · Sourcepub fn from_secs_f32(secs: f32) -> Duration
pub fn from_secs_f32(secs: f32) -> Duration
Creates a new Duration
from the specified number of seconds represented
as f32
.
§Panics
This constructor will panic if secs
is negative, overflows Duration
or not finite.
§Examples
use std::time::Duration;
let res = Duration::from_secs_f32(0.0);
assert_eq!(res, Duration::new(0, 0));
let res = Duration::from_secs_f32(1e-20);
assert_eq!(res, Duration::new(0, 0));
let res = Duration::from_secs_f32(4.2e-7);
assert_eq!(res, Duration::new(0, 420));
let res = Duration::from_secs_f32(2.7);
assert_eq!(res, Duration::new(2, 700_000_048));
let res = Duration::from_secs_f32(3e10);
assert_eq!(res, Duration::new(30_000_001_024, 0));
// subnormal float
let res = Duration::from_secs_f32(f32::from_bits(1));
assert_eq!(res, Duration::new(0, 0));
// conversion uses rounding
let res = Duration::from_secs_f32(0.999e-9);
assert_eq!(res, Duration::new(0, 1));
1.38.0 · Sourcepub fn mul_f64(self, rhs: f64) -> Duration
pub fn mul_f64(self, rhs: f64) -> Duration
Multiplies Duration
by f64
.
§Panics
This method will panic if result is negative, overflows Duration
or not finite.
§Examples
use std::time::Duration;
let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.mul_f64(3.14), Duration::new(8, 478_000_000));
assert_eq!(dur.mul_f64(3.14e5), Duration::new(847_800, 0));
1.38.0 · Sourcepub fn mul_f32(self, rhs: f32) -> Duration
pub fn mul_f32(self, rhs: f32) -> Duration
Multiplies Duration
by f32
.
§Panics
This method will panic if result is negative, overflows Duration
or not finite.
§Examples
use std::time::Duration;
let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.mul_f32(3.14), Duration::new(8, 478_000_641));
assert_eq!(dur.mul_f32(3.14e5), Duration::new(847_800, 0));
1.38.0 · Sourcepub fn div_f64(self, rhs: f64) -> Duration
pub fn div_f64(self, rhs: f64) -> Duration
Divides Duration
by f64
.
§Panics
This method will panic if result is negative, overflows Duration
or not finite.
§Examples
use std::time::Duration;
let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.div_f64(3.14), Duration::new(0, 859_872_611));
assert_eq!(dur.div_f64(3.14e5), Duration::new(0, 8_599));
1.38.0 · Sourcepub fn div_f32(self, rhs: f32) -> Duration
pub fn div_f32(self, rhs: f32) -> Duration
Divides Duration
by f32
.
§Panics
This method will panic if result is negative, overflows Duration
or not finite.
§Examples
use std::time::Duration;
let dur = Duration::new(2, 700_000_000);
// note that due to rounding errors result is slightly
// different from 0.859_872_611
assert_eq!(dur.div_f32(3.14), Duration::new(0, 859_872_580));
assert_eq!(dur.div_f32(3.14e5), Duration::new(0, 8_599));
1.80.0 (const: 1.83.0) · Sourcepub const fn div_duration_f64(self, rhs: Duration) -> f64
pub const fn div_duration_f64(self, rhs: Duration) -> f64
Divides Duration
by Duration
and returns f64
.
§Examples
use std::time::Duration;
let dur1 = Duration::new(2, 700_000_000);
let dur2 = Duration::new(5, 400_000_000);
assert_eq!(dur1.div_duration_f64(dur2), 0.5);
1.80.0 (const: 1.83.0) · Sourcepub const fn div_duration_f32(self, rhs: Duration) -> f32
pub const fn div_duration_f32(self, rhs: Duration) -> f32
Divides Duration
by Duration
and returns f32
.
§Examples
use std::time::Duration;
let dur1 = Duration::new(2, 700_000_000);
let dur2 = Duration::new(5, 400_000_000);
assert_eq!(dur1.div_duration_f32(dur2), 0.5);
Source§impl Duration
impl Duration
1.66.0 · Sourcepub fn try_from_secs_f32(secs: f32) -> Result<Duration, TryFromFloatSecsError>
pub fn try_from_secs_f32(secs: f32) -> Result<Duration, TryFromFloatSecsError>
The checked version of from_secs_f32
.
This constructor will return an Err
if secs
is negative, overflows Duration
or not finite.
§Examples
use std::time::Duration;
let res = Duration::try_from_secs_f32(0.0);
assert_eq!(res, Ok(Duration::new(0, 0)));
let res = Duration::try_from_secs_f32(1e-20);
assert_eq!(res, Ok(Duration::new(0, 0)));
let res = Duration::try_from_secs_f32(4.2e-7);
assert_eq!(res, Ok(Duration::new(0, 420)));
let res = Duration::try_from_secs_f32(2.7);
assert_eq!(res, Ok(Duration::new(2, 700_000_048)));
let res = Duration::try_from_secs_f32(3e10);
assert_eq!(res, Ok(Duration::new(30_000_001_024, 0)));
// subnormal float:
let res = Duration::try_from_secs_f32(f32::from_bits(1));
assert_eq!(res, Ok(Duration::new(0, 0)));
let res = Duration::try_from_secs_f32(-5.0);
assert!(res.is_err());
let res = Duration::try_from_secs_f32(f32::NAN);
assert!(res.is_err());
let res = Duration::try_from_secs_f32(2e19);
assert!(res.is_err());
// the conversion uses rounding with tie resolution to even
let res = Duration::try_from_secs_f32(0.999e-9);
assert_eq!(res, Ok(Duration::new(0, 1)));
// this float represents exactly 976562.5e-9
let val = f32::from_bits(0x3A80_0000);
let res = Duration::try_from_secs_f32(val);
assert_eq!(res, Ok(Duration::new(0, 976_562)));
// this float represents exactly 2929687.5e-9
let val = f32::from_bits(0x3B40_0000);
let res = Duration::try_from_secs_f32(val);
assert_eq!(res, Ok(Duration::new(0, 2_929_688)));
// this float represents exactly 1.000_976_562_5
let val = f32::from_bits(0x3F802000);
let res = Duration::try_from_secs_f32(val);
assert_eq!(res, Ok(Duration::new(1, 976_562)));
// this float represents exactly 1.002_929_687_5
let val = f32::from_bits(0x3F806000);
let res = Duration::try_from_secs_f32(val);
assert_eq!(res, Ok(Duration::new(1, 2_929_688)));
1.66.0 · Sourcepub fn try_from_secs_f64(secs: f64) -> Result<Duration, TryFromFloatSecsError>
pub fn try_from_secs_f64(secs: f64) -> Result<Duration, TryFromFloatSecsError>
The checked version of from_secs_f64
.
This constructor will return an Err
if secs
is negative, overflows Duration
or not finite.
§Examples
use std::time::Duration;
let res = Duration::try_from_secs_f64(0.0);
assert_eq!(res, Ok(Duration::new(0, 0)));
let res = Duration::try_from_secs_f64(1e-20);
assert_eq!(res, Ok(Duration::new(0, 0)));
let res = Duration::try_from_secs_f64(4.2e-7);
assert_eq!(res, Ok(Duration::new(0, 420)));
let res = Duration::try_from_secs_f64(2.7);
assert_eq!(res, Ok(Duration::new(2, 700_000_000)));
let res = Duration::try_from_secs_f64(3e10);
assert_eq!(res, Ok(Duration::new(30_000_000_000, 0)));
// subnormal float
let res = Duration::try_from_secs_f64(f64::from_bits(1));
assert_eq!(res, Ok(Duration::new(0, 0)));
let res = Duration::try_from_secs_f64(-5.0);
assert!(res.is_err());
let res = Duration::try_from_secs_f64(f64::NAN);
assert!(res.is_err());
let res = Duration::try_from_secs_f64(2e19);
assert!(res.is_err());
// the conversion uses rounding with tie resolution to even
let res = Duration::try_from_secs_f64(0.999e-9);
assert_eq!(res, Ok(Duration::new(0, 1)));
let res = Duration::try_from_secs_f64(0.999_999_999_499);
assert_eq!(res, Ok(Duration::new(0, 999_999_999)));
let res = Duration::try_from_secs_f64(0.999_999_999_501);
assert_eq!(res, Ok(Duration::new(1, 0)));
let res = Duration::try_from_secs_f64(42.999_999_999_499);
assert_eq!(res, Ok(Duration::new(42, 999_999_999)));
let res = Duration::try_from_secs_f64(42.999_999_999_501);
assert_eq!(res, Ok(Duration::new(43, 0)));
// this float represents exactly 976562.5e-9
let val = f64::from_bits(0x3F50_0000_0000_0000);
let res = Duration::try_from_secs_f64(val);
assert_eq!(res, Ok(Duration::new(0, 976_562)));
// this float represents exactly 2929687.5e-9
let val = f64::from_bits(0x3F68_0000_0000_0000);
let res = Duration::try_from_secs_f64(val);
assert_eq!(res, Ok(Duration::new(0, 2_929_688)));
// this float represents exactly 1.000_976_562_5
let val = f64::from_bits(0x3FF0_0400_0000_0000);
let res = Duration::try_from_secs_f64(val);
assert_eq!(res, Ok(Duration::new(1, 976_562)));
// this float represents exactly 1.002_929_687_5
let val = f64::from_bits(0x3_FF00_C000_0000_000);
let res = Duration::try_from_secs_f64(val);
assert_eq!(res, Ok(Duration::new(1, 2_929_688)));
Trait Implementations§
1.8.0 · Source§impl Add<Duration> for SystemTime
impl Add<Duration> for SystemTime
Source§fn add(self, dur: Duration) -> SystemTime
fn add(self, dur: Duration) -> SystemTime
§Panics
This function may panic if the resulting point in time cannot be represented by the
underlying data structure. See SystemTime::checked_add
for a version without panic.
Source§type Output = SystemTime
type Output = SystemTime
+
operator.Source§impl AddAssign<Duration> for Duration
impl AddAssign<Duration> for Duration
Source§fn add_assign(&mut self, rhs: Duration)
fn add_assign(&mut self, rhs: Duration)
§Panics
This may panic if the resulting addition cannot be represented.
1.9.0 · Source§impl AddAssign<Duration> for Instant
impl AddAssign<Duration> for Instant
Source§fn add_assign(&mut self, other: Duration)
fn add_assign(&mut self, other: Duration)
+=
operation. Read more1.9.0 · Source§impl AddAssign<Duration> for SystemTime
impl AddAssign<Duration> for SystemTime
Source§fn add_assign(&mut self, other: Duration)
fn add_assign(&mut self, other: Duration)
+=
operation. Read more1.9.0 · Source§impl AddAssign for Duration
impl AddAssign for Duration
Source§fn add_assign(&mut self, rhs: Duration)
fn add_assign(&mut self, rhs: Duration)
+=
operation. Read moreSource§impl<'de> Deserialize<'de> for Duration
impl<'de> Deserialize<'de> for Duration
Source§fn deserialize<D>(
deserializer: D,
) -> Result<Duration, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
fn deserialize<D>(
deserializer: D,
) -> Result<Duration, <D as Deserializer<'de>>::Error>where
D: Deserializer<'de>,
1.9.0 · Source§impl DivAssign<u32> for Duration
impl DivAssign<u32> for Duration
Source§fn div_assign(&mut self, rhs: u32)
fn div_assign(&mut self, rhs: u32)
/=
operation. Read more1.9.0 · Source§impl MulAssign<u32> for Duration
impl MulAssign<u32> for Duration
Source§fn mul_assign(&mut self, rhs: u32)
fn mul_assign(&mut self, rhs: u32)
*=
operation. Read more1.3.0 · Source§impl Ord for Duration
impl Ord for Duration
Source§impl PartialOrd<Duration> for Duration
impl PartialOrd<Duration> for Duration
1.3.0 · Source§impl PartialOrd for Duration
impl PartialOrd for Duration
Source§impl SampleUniform for Duration
impl SampleUniform for Duration
Source§type Sampler = UniformDuration
type Sampler = UniformDuration
UniformSampler
implementation supporting type X
.Source§impl Serialize for Duration
impl Serialize for Duration
Source§fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
fn serialize<S>(
&self,
serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>where
S: Serializer,
1.8.0 · Source§impl Sub<Duration> for SystemTime
impl Sub<Duration> for SystemTime
Source§type Output = SystemTime
type Output = SystemTime
-
operator.Source§impl SubAssign<Duration> for Duration
impl SubAssign<Duration> for Duration
Source§fn sub_assign(&mut self, rhs: Duration)
fn sub_assign(&mut self, rhs: Duration)
§Panics
This may panic if the resulting subtraction can not be represented.
1.9.0 · Source§impl SubAssign<Duration> for Instant
impl SubAssign<Duration> for Instant
Source§fn sub_assign(&mut self, other: Duration)
fn sub_assign(&mut self, other: Duration)
-=
operation. Read more1.9.0 · Source§impl SubAssign<Duration> for SystemTime
impl SubAssign<Duration> for SystemTime
Source§fn sub_assign(&mut self, other: Duration)
fn sub_assign(&mut self, other: Duration)
-=
operation. Read more1.9.0 · Source§impl SubAssign for Duration
impl SubAssign for Duration
Source§fn sub_assign(&mut self, rhs: Duration)
fn sub_assign(&mut self, rhs: Duration)
-=
operation. Read moreimpl Copy for Duration
impl Eq for Duration
impl StructuralPartialEq for Duration
Auto Trait Implementations§
impl Freeze for Duration
impl RefUnwindSafe for Duration
impl Send for Duration
impl Sync for Duration
impl Unpin for Duration
impl UnwindSafe for Duration
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
Source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
Source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.Source§impl<T, W> HasTypeWitness<W> for Twhere
W: MakeTypeWitness<Arg = T>,
T: ?Sized,
impl<T, W> HasTypeWitness<W> for Twhere
W: MakeTypeWitness<Arg = T>,
T: ?Sized,
Source§impl<T> Identity for Twhere
T: ?Sized,
impl<T> Identity for Twhere
T: ?Sized,
Source§impl<T> Instrument for T
impl<T> Instrument for T
Source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
Source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moreSource§impl<Borrowed> SampleBorrow<Borrowed> for Borrowedwhere
Borrowed: SampleUniform,
impl<Borrowed> SampleBorrow<Borrowed> for Borrowedwhere
Borrowed: SampleUniform,
Source§fn borrow(&self) -> &Borrowed
fn borrow(&self) -> &Borrowed
Borrow::borrow