Module type Collection.Map.M


module type M = sig .. end

type key 
type 'a t 
val is_empty : 'a t -> bool
val mem : 'a t -> key -> bool
val find : 'a t -> key -> 'a
val size : 'a t -> int
val iter : (key -> 'a -> unit) -> 'a t -> unit
val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b