Struct CountMonoid 

pub struct CountMonoid;

Trait Implementations

impl AggregationMonoid for CountMonoid

fn identity(&self) -> AggState

fn accumulate( &self, state: AggState, _value: &Value, ) -> StorageBackendResult<AggState>

fn combine(&self, a: AggState, b: AggState) -> StorageBackendResult<AggState>

fn finalize(&self, state: AggState) -> StorageBackendResult<Value>

impl Clone for CountMonoid

fn clone(&self) -> CountMonoid

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CountMonoid

impl Debug for CountMonoid

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

Formats the value using the given formatter.

impl Default for CountMonoid

fn default() -> CountMonoid

Returns the “default value” for a type.