Struct std::time::Instant [] [src]

pub struct Instant(_);
Unstable (time2 #29866)

: recently added

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).


impl Instant

fn now() -> Instant

Unstable (time2 #29866)

: recently added

Returns an instant corresponding to "now".

fn duration_from_earlier(&self, earlier: Instant) -> Duration

Unstable (time2 #29866)

: recently added

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


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

Unstable (time2 #29866)

: recently added

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.

Trait Implementations

impl Add<Duration> for Instant

type Output = Instant

fn add(self, other: Duration) -> Instant

impl Sub<Duration> for Instant

type Output = Instant

fn sub(self, other: Duration) -> Instant

impl Debug for Instant

fn fmt(&self, f: &mut Formatter) -> Result

Derived Implementations

impl Ord for Instant

fn cmp(&self, __arg_0: &Instant) -> Ordering

impl PartialOrd for Instant

fn partial_cmp(&self, __arg_0: &Instant) -> Option<Ordering>

fn lt(&self, __arg_0: &Instant) -> bool

fn le(&self, __arg_0: &Instant) -> bool

fn gt(&self, __arg_0: &Instant) -> bool

fn ge(&self, __arg_0: &Instant) -> bool

impl Eq for Instant

impl PartialEq for Instant

fn eq(&self, __arg_0: &Instant) -> bool

fn ne(&self, __arg_0: &Instant) -> bool

impl Clone for Instant

fn clone(&self) -> Instant

fn clone_from(&mut self, source: &Self)

impl Copy for Instant