std::time::Instant - Rust (original) (raw)
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();
sleep(Duration::new(2, 0));
println!("{}", now.elapsed().as_secs()); }Run
impl [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
pub fn [now](#method.now)() -> [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
Returns an instant corresponding to "now".
use std::time::Instant;
let now = Instant::now();Run
pub fn [duration_since](#method.duration%5Fsince)(&self, earlier: [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")) -> [Duration](../../std/time/struct.Duration.html "struct std::time::Duration")[src]
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));Run
pub fn [elapsed](#method.elapsed)(&self) -> [Duration](../../std/time/struct.Duration.html "struct std::time::Duration")[src]
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);Run
impl [Copy](../../std/marker/trait.Copy.html "trait std:📑:Copy") for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [Clone](../../std/clone/trait.Clone.html "trait std::clone::Clone") for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [PartialEq](../../std/cmp/trait.PartialEq.html "trait std::cmp::PartialEq") for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [Eq](../../std/cmp/trait.Eq.html "trait std::cmp::Eq") for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [PartialOrd](../../std/cmp/trait.PartialOrd.html "trait std::cmp::PartialOrd") for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [Ord](../../std/cmp/trait.Ord.html "trait std::cmp::Ord") for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [Hash](../../std/hash/trait.Hash.html "trait std::hash::Hash") for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [Add](../../std/ops/trait.Add.html "trait std::ops::Add")<[Duration](../../std/time/struct.Duration.html "struct std::time::Duration")> for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [AddAssign](../../std/ops/trait.AddAssign.html "trait std::ops::AddAssign")<[Duration](../../std/time/struct.Duration.html "struct std::time::Duration")> for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")
1.9.0
impl [Sub](../../std/ops/trait.Sub.html "trait std::ops::Sub")<[Duration](../../std/time/struct.Duration.html "struct std::time::Duration")> for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")[src]
impl [SubAssign](../../std/ops/trait.SubAssign.html "trait std::ops::SubAssign")<[Duration](../../std/time/struct.Duration.html "struct std::time::Duration")> for [Instant](../../std/time/struct.Instant.html "struct std::time::Instant")
1.9.0