Type Alias GroupingMapBy 

pub type GroupingMapBy<I, F, S = RandomState> = GroupingMap<MapSpecialCase<I, GroupingMapFn<F>>, S>;

GroupingMapBy is an intermediate struct for efficient group-and-fold operations.

See GroupingMap for more information.

Aliased Type

pub struct GroupingMapBy<I, F, S = RandomState> { /* private fields */ }