Struct Instant 

pub struct Instant(/* private fields */);

A monotonic reading from an injected clock.

Why a duration and not a wall clock

Two sessions started in the same millisecond are indistinguishable, and two readings of a wall clock can go backwards when NTP steps. A duration from whichever origin the adapter chose has neither problem, and it makes every comparison in the engine a subtraction.

The origin is the adapter’s business. Nothing here reads a clock, so nothing here can disagree with one.

Implementations

impl Instant

pub const fn from_duration(since: Duration) -> Self

A reading since after the clock’s origin.

pub const fn as_duration(self) -> Duration

The reading, as a duration from the clock’s origin.

pub const fn since(self, earlier: Self) -> Duration

How much time passed between earlier and self.

Saturating rather than wrapping: a clock whose second reading somehow precedes the first should report no elapsed time, not a duration near u64::MAX that would expire every in-flight request at once.

pub const fn advanced(self, by: Duration) -> Self

This reading, by later.

Trait Implementations

impl Clone for Instant

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Instant

impl Debug for Instant

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

Formats the value using the given formatter.

impl Default for Instant

fn default() -> Self

Returns the “default value” for a type.

impl Display for Instant

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

Formats the value using the given formatter.

impl Eq for Instant

impl Hash for Instant

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Instant

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Instant

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Instant

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Instant