Struct Lsn 

pub struct Lsn(pub u64);

Log Sequence Number. Newtype to prevent mixing with byte offsets/counts.

Lsn(0) is reserved as “none”; real records are dense starting at 1 (§6 of docs/wal_design_v6.md).

Tuple Fields

0: u64

Implementations

impl Lsn

pub const NONE: Lsn

The reserved “none” sentinel. Never assigned to a real record.

pub const FIRST: Lsn

The first valid record LSN. Records are dense starting here.

pub const fn next(self) -> Lsn

The next LSN in sequence. Saturating, so Lsn(u64::MAX).next() does not wrap (a 2^64-record log is not reachable in practice, but recovery must never panic on arbitrary inputs — D11).

pub const fn is_none(self) -> bool

True for the reserved Lsn(0) sentinel.

Trait Implementations

impl Clone for Lsn

fn clone(&self) -> Lsn

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Lsn

impl Debug for Lsn

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

Formats the value using the given formatter.

impl Display for Lsn

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

Formats the LSN as its underlying integer, so error and log messages can use {lsn} instead of poking at the .0 field.

impl Eq for Lsn

impl Hash for Lsn

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 Lsn

fn cmp(&self, other: &Lsn) -> 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 Lsn

fn eq(&self, other: &Lsn) -> 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 Lsn

fn partial_cmp(&self, other: &Lsn) -> 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 Lsn