Struct std::time::Instant
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[src]
pub struct Instant(_);
A measurement of a monotonically increasing clock.
Instants are always guaranteed to be greater 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).
Methods
impl Instant
fn now() -> Instant
Returns an instant corresponding to "now".
fn duration_from_earlier(&self, earlier: Instant) -> Duration
Returns the amount of time elapsed from another instant to this one.
Panics
This function will panic if earlier is later than self, which should
only be possible if earlier was created after self. Because
Instant is monotonic, the only time that this should happen should be
a bug.
fn elapsed(&self) -> Duration
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.