Struct time::Instant

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#[repr(transparent)]
pub struct Instant(pub StdInstant);
Expand description

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.

Tuple Fields§

§0: StdInstant

Implementations§

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impl Instant

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pub fn now() -> Self

Returns an Instant corresponding to “now”.

println!("{:?}", Instant::now());
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pub fn elapsed(self) -> Duration

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());
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pub fn checked_add(self, duration: Duration) -> Option<Self>

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()));
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pub fn checked_sub(self, duration: Duration) -> Option<Self>

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()));
Run
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pub const fn into_inner(self) -> StdInstant

Obtain the inner std::time::Instant.

let now = Instant::now();
assert_eq!(now.into_inner(), now.0);
Run

Trait Implementations§

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impl Add<Duration> for Instant

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fn add(self, duration: Duration) -> Self::Output

Panics

This function may panic if the resulting point in time cannot be represented by the underlying data structure.

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type Output = Instant

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

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type Output = Instant

The resulting type after applying the + operator.
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fn add(self, duration: StdDuration) -> Self::Output

Performs the + operation. Read more
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impl AddAssign<Duration> for Instant

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fn add_assign(&mut self, rhs: StdDuration)

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

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fn add_assign(&mut self, rhs: Duration)

Performs the += operation. Read more
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impl AsRef<Instant> for Instant

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fn as_ref(&self) -> &StdInstant

Converts this type into a shared reference of the (usually inferred) input type.
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impl Borrow<Instant> for Instant

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fn borrow(&self) -> &StdInstant

Immutably borrows from an owned value. Read more
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impl Clone for Instant

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fn clone(&self) -> Instant

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Instant

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

Formats the value using the given formatter. Read more
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impl From<Instant> for Instant

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fn from(instant: StdInstant) -> Self

Converts to this type from the input type.
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impl From<Instant> for StdInstant

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fn from(instant: Instant) -> Self

Converts to this type from the input type.
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impl Hash for Instant

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for Instant

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

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl PartialEq<Instant> for Instant

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialEq<Instant> for Instant

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fn eq(&self, rhs: &StdInstant) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialEq<Instant> for StdInstant

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd<Instant> for Instant

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl PartialOrd<Instant> for Instant

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fn partial_cmp(&self, rhs: &StdInstant) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

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

fn gt(&self, other: &Rhs) -> bool

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

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl PartialOrd<Instant> for StdInstant

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

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

fn lt(&self, other: &Rhs) -> bool

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

fn le(&self, other: &Rhs) -> bool

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

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Sub<Duration> for Instant

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fn sub(self, duration: StdDuration) -> Self::Output

Panics

This function may panic if the resulting point in time cannot be represented by the underlying data structure.

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type Output = Instant

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

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fn sub(self, duration: Duration) -> Self::Output

Panics

This function may panic if the resulting point in time cannot be represented by the underlying data structure.

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type Output = Instant

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

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type Output = Duration

The resulting type after applying the - operator.
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fn sub(self, other: Self) -> Self::Output

Performs the - operation. Read more
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impl Sub<Instant> for Instant

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type Output = Duration

The resulting type after applying the - operator.
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fn sub(self, other: StdInstant) -> Self::Output

Performs the - operation. Read more
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impl Sub<Instant> for StdInstant

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type Output = Duration

The resulting type after applying the - operator.
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fn sub(self, other: Instant) -> Self::Output

Performs the - operation. Read more
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impl SubAssign<Duration> for Instant

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fn sub_assign(&mut self, rhs: StdDuration)

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

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fn sub_assign(&mut self, rhs: Duration)

Performs the -= operation. Read more
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impl Copy for Instant

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impl Eq for Instant

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impl StructuralEq for Instant

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impl StructuralPartialEq for Instant

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.