Struct Generation 

pub struct Generation { /* private fields */ }

A named monotonic counter.

Implementations

impl Generation

pub fn new(key: impl Into<String>) -> Self

Name a counter. Many independent counters can coexist in one database.

pub fn ensure_schema(db: &dyn Backend) -> Result<()>

Create the backing meta table if it does not exist. Idempotent.

pub fn current(&self, db: &dyn Backend) -> Result<u64>

The current value (0 if the counter has never been bumped).

pub fn bump(&self, db: &dyn Backend) -> Result<u64>

Atomically increment and return the new value. The first bump yields 1.

pub fn set(&self, db: &dyn Backend, value: u64) -> Result<()>

Set the counter to an explicit value, refusing to move it backward.

Trait Implementations

impl Clone for Generation

fn clone(&self) -> Generation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Generation

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

Formats the value using the given formatter.