Struct std::time::Instant1.8.0 [] [src]

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());
}Run

Methods

impl Instant
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Returns an instant corresponding to "now".

Examples

use std::time::Instant;

let now = Instant::now();Run

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Returns the amount of time elapsed from another instant to this one.

Panics

This function will panic if earlier is later than self.

Examples

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));Run

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Returns the amount of time elapsed since this instant was created.

Panics

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.

Examples

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);Run

Trait Implementations

impl Copy for Instant
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impl Clone for Instant
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl PartialEq for Instant
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl Eq for Instant
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impl PartialOrd for Instant
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This method returns an ordering between self and other values if one exists. Read more

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This method tests less than (for self and other) and is used by the < operator. Read more

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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

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This method tests greater than (for self and other) and is used by the > operator. Read more

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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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This method returns an Ordering between self and other. Read more

1.21.0
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Compares and returns the maximum of two values. Read more

1.21.0
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Compares and returns the minimum of two values. Read more

impl Hash for Instant
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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl Add<Duration> for Instant
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The resulting type after applying the + operator.

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Performs the + operation.

impl AddAssign<Duration> for Instant
1.9.0
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Performs the += operation.

impl Sub<Duration> for Instant
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The resulting type after applying the - operator.

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Performs the - operation.

impl SubAssign<Duration> for Instant
1.9.0
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Performs the -= operation.

impl Sub<Instant> for Instant
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The resulting type after applying the - operator.

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Performs the - operation.

impl Debug for Instant
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Formats the value using the given formatter. Read more

Auto Trait Implementations

impl Send for Instant

impl Sync for Instant