pub struct Instant(_);
A measurement of a monotonically nondecreasing clock. Opaque and useful only with Duration.
Instants are always guaranteed to be no less than any previously measured instant when created, and are often useful for tasks such as measuring benchmarks or timing how long an operation takes.
Note, however, that instants are not guaranteed to be steady. In other words, each tick of the underlying clock may not be the same length (e.g. some seconds may be longer than others). An instant may jump forwards or experience time dilation (slow down or speed up), but it will never go backwards.
Instants are opaque types that can only be compared to one another. There is no method to get "the number of seconds" from an instant. Instead, it only allows measuring the duration between two instants (or comparing two instants).
Example:
use std::time::{Duration, Instant};
use std::thread::sleep;
fn main() {
let now = Instant::now();
// we sleep for 2 seconds
sleep(Duration::new(2, 0));
// it prints '2'
println!("{}", now.elapsed().as_secs());
} impl Instant
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pub fn now() -> Instant
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Returns an instant corresponding to "now".
use std::time::Instant; let now = Instant::now();
pub fn duration_since(&self, earlier: Instant) -> Duration
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Returns the amount of time elapsed from another instant to this one.
This function will panic if earlier is later than self.
use std::time::{Duration, Instant};
use std::thread::sleep;
let now = Instant::now();
sleep(Duration::new(1, 0));
let new_now = Instant::now();
println!("{:?}", new_now.duration_since(now)); pub fn elapsed(&self) -> Duration
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Returns the amount of time elapsed since this instant was created.
This function may panic if the current time is earlier than this instant, which is something that can happen if an Instant is produced synthetically.
use std::thread::sleep;
use std::time::{Duration, Instant};
let instant = Instant::now();
let three_secs = Duration::from_secs(3);
sleep(three_secs);
assert!(instant.elapsed() >= three_secs); impl Copy for Instant
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impl Clone for Instant
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fn clone(&self) -> Instant
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source. Read more
impl PartialEq for Instant
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fn eq(&self, __arg_0: &Instant) -> bool
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This method tests for self and other values to be equal, and is used by ==. Read more
fn ne(&self, __arg_0: &Instant) -> bool
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This method tests for !=.
impl Eq for Instant
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impl PartialOrd for Instant
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fn partial_cmp(&self, __arg_0: &Instant) -> Option<Ordering>
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This method returns an ordering between self and other values if one exists. Read more
fn lt(&self, __arg_0: &Instant) -> bool
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This method tests less than (for self and other) and is used by the < operator. Read more
fn le(&self, __arg_0: &Instant) -> bool
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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
fn gt(&self, __arg_0: &Instant) -> bool
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This method tests greater than (for self and other) and is used by the > operator. Read more
fn ge(&self, __arg_0: &Instant) -> bool
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This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
impl Ord for Instant
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fn cmp(&self, __arg_0: &Instant) -> Ordering
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This method returns an Ordering between self and other. Read more
fn max(self, other: Self) -> Self
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
Compares and returns the minimum of two values. Read more
impl Add<Duration> for Instant
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type Output = InstantThe resulting type after applying the + operator.
fn add(self, other: Duration) -> Instant
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Performs the + operation.
impl AddAssign<Duration> for Instant
fn add_assign(&mut self, other: Duration)
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Performs the += operation.
impl Sub<Duration> for Instant
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type Output = InstantThe resulting type after applying the - operator.
fn sub(self, other: Duration) -> Instant
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Performs the - operation.
impl SubAssign<Duration> for Instant
fn sub_assign(&mut self, other: Duration)
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Performs the -= operation.
impl Sub<Instant> for Instant
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type Output = DurationThe resulting type after applying the - operator.
fn sub(self, other: Instant) -> Duration
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Performs the - operation.
impl Debug for Instant
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fn fmt(&self, f: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/time/struct.Instant.html