Struct Uptime 

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

A point on the monotonic clock, in nanoseconds since an origin near boot.

It never steps, and every process on a machine reads the same clock, so a deadline is an Uptime plus a Timedelta; it names no moment off this machine, which a Timestamp does. It is written as the span since its origin, and parses back from it.

Examples

use t2t_core::{Timedelta, Uptime};

let start = Uptime::from_secs(42);
let deadline = start + Timedelta::from_millis(50);

assert!(start < deadline, "a deadline lies ahead");
assert_eq!(deadline.to_string(), "42s50ms", "written as the span since the origin");

Implementations

impl Uptime

pub const MIN: Self

The earliest point the count holds.

pub const MAX: Self

The latest point the count holds.

pub const fn checked_add(self, span: Timedelta) -> Option<Self>

The point span later, or None past the range.

pub const fn checked_sub(self, span: Timedelta) -> Option<Self>

The point span earlier, or None past the range.

pub const fn checked_since(self, start: Self) -> Option<Timedelta>

The span since start, or None past the span’s range.

pub const fn floor(self, unit: Timedelta) -> Self

The nearest multiple of |unit| at or below the point, or the point for a zero unit.

pub const fn ceil(self, unit: Timedelta) -> Self

The nearest multiple of |unit| at or above the point, or the point for a zero unit.

impl Uptime

pub const fn from_nanos(nanos: i64) -> Self

The point nanos nanoseconds after the monotonic clock’s origin.

pub const fn from_micros(micros: i64) -> Self

The point micros microseconds after the monotonic clock’s origin, saturating.

pub const fn from_millis(millis: i64) -> Self

The point millis milliseconds after the monotonic clock’s origin, saturating.

pub const fn from_secs(secs: i64) -> Self

The point secs seconds after the monotonic clock’s origin, saturating.

pub const fn as_nanos(self) -> i64

Nanoseconds since the monotonic clock’s origin.

pub const fn as_micros(self) -> i64

Whole microseconds since the monotonic clock’s origin, rounded down.

pub const fn as_millis(self) -> i64

Whole milliseconds since the monotonic clock’s origin, rounded down.

pub const fn as_secs(self) -> i64

Whole seconds since the monotonic clock’s origin, rounded down.

Trait Implementations

impl Add<Timedelta> for Uptime

Saturates at MIN and MAX.

type Output = Uptime

The resulting type after applying the + operator.

fn add(self, span: Timedelta) -> Self

Performs the + operation.

impl AddAssign<Timedelta> for Uptime

Saturates at MIN and MAX.

fn add_assign(&mut self, span: Timedelta)

Performs the += operation.

impl Clone for Uptime

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 Uptime

impl Debug for Uptime

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

Formats the value using the given formatter.

impl Default for Uptime

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Uptime

Available on crate feature serde only.

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Display for Uptime

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

Formats the value using the given formatter.

impl Eq for Uptime

impl FromBytes for Uptime

where i64: FromBytes,

Available on crate feature zerocopy only.

fn ref_from_bytes( source: &[u8], ) -> Result<&Self, ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, !>>

where Self: KnownLayout + Immutable,

Interprets the given source as a &Self.

fn ref_from_prefix( source: &[u8], ) -> Result<(&Self, &[u8]), ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, !>>

where Self: KnownLayout + Immutable,

Interprets the prefix of the given source as a &Self without copying.

fn ref_from_suffix( source: &[u8], ) -> Result<(&[u8], &Self), ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, !>>

where Self: Immutable + KnownLayout,

Interprets the suffix of the given bytes as a &Self.

fn mut_from_bytes( source: &mut [u8], ) -> Result<&mut Self, ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, !>>

where Self: IntoBytes + KnownLayout,

Interprets the given source as a &mut Self.

fn mut_from_prefix( source: &mut [u8], ) -> Result<(&mut Self, &mut [u8]), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, !>>

where Self: IntoBytes + KnownLayout,

Interprets the prefix of the given source as a &mut Self without copying.

fn mut_from_suffix( source: &mut [u8], ) -> Result<(&mut [u8], &mut Self), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, !>>

where Self: IntoBytes + KnownLayout,

Interprets the suffix of the given source as a &mut Self without copying.

fn read_from_bytes(source: &[u8]) -> Result<Self, SizeError<&[u8], Self>>

where Self: Sized,

Reads a copy of Self from the given source.

fn read_from_prefix( source: &[u8], ) -> Result<(Self, &[u8]), SizeError<&[u8], Self>>

where Self: Sized,

Reads a copy of Self from the prefix of the given source.

fn read_from_suffix( source: &[u8], ) -> Result<(&[u8], Self), SizeError<&[u8], Self>>

where Self: Sized,

Reads a copy of Self from the suffix of the given source.

fn read_from_io<R>(src: R) -> Result<Self, Error>

where Self: Sized, R: Read,

Available on crate feature std only.

Reads a copy of self from an io::Read.

impl FromStr for Uptime

Reads what Display writes: the span since the origin.

type Err = ParseTimedeltaError

The associated error which can be returned from parsing.

fn from_str(text: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl FromZeros for Uptime

where i64: FromZeros,

Available on crate feature zerocopy only.

fn zero(&mut self)

Overwrites self with zeros.

fn new_zeroed() -> Self

where Self: Sized,

Creates an instance of Self from zeroed bytes.

fn new_box_zeroed() -> Result<Box<Self>, AllocError>

where Self: Sized,

Available on crate features alloc only.

Creates a Box<Self> from zeroed bytes.

fn new_vec_zeroed(len: usize) -> Result<Vec<Self>, AllocError>

where Self: Sized,

Available on crate feature alloc only.

Creates a Vec<Self> from zeroed bytes.

fn extend_vec_zeroed( v: &mut Vec<Self>, additional: usize, ) -> Result<(), AllocError>

where Self: Sized,

Available on crate feature alloc and non-no_zerocopy_panic_in_const_and_vec_try_reserve_1_57_0 only.

Extends a Vec<Self> by pushing additional new items onto the end of the vector. The new items are initialized with zeros.

fn insert_vec_zeroed( v: &mut Vec<Self>, position: usize, additional: usize, ) -> Result<(), AllocError>

where Self: Sized,

Available on crate feature alloc and non-no_zerocopy_panic_in_const_and_vec_try_reserve_1_57_0 only.

Inserts additional new items into Vec<Self> at position. The new items are initialized with zeros.

impl Hash for Uptime

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 Immutable for Uptime

where i64: Immutable,

Available on crate feature zerocopy only.

impl IntoBytes for Uptime

where i64: IntoBytes,

Available on crate feature zerocopy only.

fn as_bytes(&self) -> &[u8]

where Self: Immutable,

Gets the bytes of this value.

fn as_mut_bytes(&mut self) -> &mut [u8]

where Self: FromBytes,

Gets the bytes of this value mutably.

fn write_to(&self, dst: &mut [u8]) -> Result<(), SizeError<&Self, &mut [u8]>>

where Self: Immutable,

Writes a copy of self to dst.

fn write_to_prefix( &self, dst: &mut [u8], ) -> Result<(), SizeError<&Self, &mut [u8]>>

where Self: Immutable,

Writes a copy of self to the prefix of dst.

fn write_to_suffix( &self, dst: &mut [u8], ) -> Result<(), SizeError<&Self, &mut [u8]>>

where Self: Immutable,

Writes a copy of self to the suffix of dst.

fn write_to_io<W>(&self, dst: W) -> Result<(), Error>

where Self: Immutable, W: Write,

Available on crate feature std only.

Writes a copy of self to an io::Write.

impl JsonSchema for Uptime

Available on crate features schemars and serde only.

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn json_schema(_generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

impl KnownLayout for Uptime

where Self: Sized,

Available on crate feature zerocopy only.

type PointerMetadata = ()

The type of metadata stored in a pointer to Self.

fn size_for_metadata(meta: Self::PointerMetadata) -> Option<usize>

Computes the size of an object of type Self with the given pointer metadata.

impl Ord for Uptime

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 Uptime

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Uptime

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 Serialize for Uptime

Available on crate feature serde only.

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Uptime

impl Sub for Uptime

The span since the other point, saturating at the span’s range.

type Output = Timedelta

The resulting type after applying the - operator.

fn sub(self, start: Self) -> Timedelta

Performs the - operation.

impl Sub<Timedelta> for Uptime

Saturates at MIN and MAX.

type Output = Uptime

The resulting type after applying the - operator.

fn sub(self, span: Timedelta) -> Self

Performs the - operation.

impl SubAssign<Timedelta> for Uptime

Saturates at MIN and MAX.

fn sub_assign(&mut self, span: Timedelta)

Performs the -= operation.

impl TimePoint for Uptime

type Span = Timedelta

The span between two points.

fn from_count(count: i64) -> Self

The point count units after the origin.

fn count(self) -> i64

The point’s count of units since the origin.

impl TryFromBytes for Uptime

where i64: TryFromBytes,

Available on crate feature zerocopy only.

fn try_ref_from_bytes( source: &[u8], ) -> Result<&Self, ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: KnownLayout + Immutable,

Attempts to interpret the given source as a &Self.

fn try_ref_from_prefix( source: &[u8], ) -> Result<(&Self, &[u8]), ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: KnownLayout + Immutable,

Attempts to interpret the prefix of the given source as a &Self.

fn try_ref_from_suffix( source: &[u8], ) -> Result<(&[u8], &Self), ConvertError<AlignmentError<&[u8], Self>, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: KnownLayout + Immutable,

Attempts to interpret the suffix of the given source as a &Self.

fn try_mut_from_bytes( bytes: &mut [u8], ) -> Result<&mut Self, ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout + IntoBytes,

Attempts to interpret the given source as a &mut Self without copying.

fn try_mut_from_prefix( source: &mut [u8], ) -> Result<(&mut Self, &mut [u8]), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout + IntoBytes,

Attempts to interpret the prefix of the given source as a &mut Self.

fn try_mut_from_suffix( source: &mut [u8], ) -> Result<(&mut [u8], &mut Self), ConvertError<AlignmentError<&mut [u8], Self>, SizeError<&mut [u8], Self>, ValidityError<&mut [u8], Self>>>

where Self: KnownLayout + IntoBytes,

Attempts to interpret the suffix of the given source as a &mut Self.

fn try_read_from_bytes( source: &[u8], ) -> Result<Self, ConvertError<!, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read the given source as a Self.

fn try_read_from_prefix( source: &[u8], ) -> Result<(Self, &[u8]), ConvertError<!, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read a Self from the prefix of the given source.

fn try_read_from_suffix( source: &[u8], ) -> Result<(&[u8], Self), ConvertError<!, SizeError<&[u8], Self>, ValidityError<&[u8], Self>>>

where Self: Sized,

Attempts to read a Self from the suffix of the given source.