Struct ValidityTs 

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

Reverse-ordered validity timestamp for efficient disk-storage scans.

Wraps a signed 64-bit timestamp with reversed ordering so that newer timestamps sort before older ones in byte-ordered storage.

Key Encoding

Use versioned_key to produce a 16-byte key combining an entity ID with a validity timestamp. The entity ID sorts in natural order, while the timestamp sorts in reverse order within each entity, so a forward scan returns the newest version first.

Implementations

impl ValidityTs

pub fn new(ts: i64) -> Self

Creates a new validity timestamp.

pub fn current() -> Self

Returns a sentinel value representing “always current.”

Uses i64::MAX so it sorts before every real timestamp in reverse order.

pub fn timestamp(&self) -> i64

Returns the underlying timestamp value.

pub fn versioned_key(entity_id: u64, ts: Self) -> [u8; 16]

Encodes an entity ID and validity timestamp into a 16-byte key.

Layout: [entity_id: 8 bytes BE][timestamp: 8 bytes BE]

Because ValidityTs uses Reverse<i64>, the timestamp bytes are the raw i64 in big-endian. To get reverse-sorted timestamps in byte order, callers should negate or bitwise-complement the timestamp before creating the ValidityTs. For a simpler approach, use i64::MAX - epoch as the timestamp value.

pub fn from_versioned_key(key: &[u8; 16]) -> (u64, Self)

Decodes entity ID and timestamp from a 16-byte versioned key.

Returns (entity_id, ValidityTs).

Trait Implementations

impl Clone for ValidityTs

fn clone(&self) -> ValidityTs

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ValidityTs

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

Formats the value using the given formatter.

impl From<i64> for ValidityTs

fn from(ts: i64) -> Self

Converts to this type from the input type.

impl Hash for ValidityTs

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 ValidityTs

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.

impl PartialEq for ValidityTs

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for ValidityTs

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 Copy for ValidityTs

impl Eq for ValidityTs

impl StructuralPartialEq for ValidityTs