Struct time::Instant[][src]

pub struct Instant { /* fields omitted */ }

A measurement of a monotonically non-decreasing 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).

This implementation allows for operations with signed Durations, but is otherwise identical to std::time::Instant.

Implementations

impl Instant[src]

pub fn now() -> Self[src]

Returns an Instant corresponding to “now”.

println!("{:?}", Instant::now());

pub fn elapsed(self) -> Duration[src]

Returns the amount of time elapsed since this instant was created. The duration will always be nonnegative if the instant is not synthetically created.

let instant = Instant::now();
thread::sleep(1.std_milliseconds());
assert!(instant.elapsed() >= 1.milliseconds());

pub fn checked_add(self, duration: Duration) -> Option<Self>[src]

Returns Some(t) where t is the time self + duration if t can be represented as Instant (which means it’s inside the bounds of the underlying data structure), None otherwise.

let now = Instant::now();
assert_eq!(
    now.checked_add(5.seconds()),
    Some(now + 5.seconds())
);
assert_eq!(
    now.checked_add((-5).seconds()),
    Some(now + (-5).seconds())
);

This function is only present when using rustc >= 1.34.0.

pub fn checked_sub(self, duration: Duration) -> Option<Self>[src]

Returns Some(t) where t is the time self - duration if t can be represented as Instant (which means it’s inside the bounds of the underlying data structure), None otherwise.

let now = Instant::now();
assert_eq!(
    now.checked_sub(5.seconds()),
    Some(now - 5.seconds())
);
assert_eq!(
    now.checked_sub((-5).seconds()),
    Some(now - (-5).seconds())
);

This function is only present when using rustc >= 1.34.0.

impl Instant[src]

pub fn to(&self, later: Self) -> Duration[src]

👎 Deprecated since 0.2.0:

Use rhs - lhs

Trait Implementations

impl Add<Duration> for Instant[src]

type Output = Self

The resulting type after applying the + operator.

impl Add<Duration> for Instant[src]

type Output = Self

The resulting type after applying the + operator.

impl AddAssign<Duration> for Instant[src]

impl AddAssign<Duration> for Instant[src]

impl Clone for Instant[src]

impl Copy for Instant[src]

impl Debug for Instant[src]

impl Eq for Instant[src]

impl From<Instant> for Instant[src]

impl Hash for Instant[src]

impl Ord for Instant[src]

impl PartialEq<Instant> for Instant[src]

impl PartialEq<Instant> for Instant[src]

impl PartialOrd<Instant> for Instant[src]

impl PartialOrd<Instant> for Instant[src]

impl StructuralEq for Instant[src]

impl StructuralPartialEq for Instant[src]

impl Sub<Duration> for Instant[src]

type Output = Self

The resulting type after applying the - operator.

impl Sub<Duration> for Instant[src]

type Output = Self

The resulting type after applying the - operator.

impl Sub<Instant> for Instant[src]

type Output = Duration

The resulting type after applying the - operator.

impl Sub<Instant> for Instant[src]

type Output = Duration

The resulting type after applying the - operator.

impl SubAssign<Duration> for Instant[src]

impl SubAssign<Duration> for Instant[src]

Auto Trait Implementations

impl RefUnwindSafe for Instant

impl Send for Instant

impl Sync for Instant

impl Unpin for Instant

impl UnwindSafe for Instant

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> Sealed<T> for T where
    T: ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.