functor (Ord : Map.OrderedType) ->
sig
type key = Ord.t
type +'a t
val empty : 'a t
val is_empty : 'a t -> bool
val add : key -> 'a -> 'a t -> 'a t
val find : key -> 'a t -> 'a
val remove : key -> 'a t -> 'a t
val mem : key -> 'a t -> bool
val iter : (key -> 'a -> unit) -> 'a t -> unit
val map : ('a -> 'b) -> 'a t -> 'b t
val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
val fold2 :
?skip:('a t -> 'b t -> bool) ->
('a option -> 'b option -> 'c -> 'c) -> 'a t -> 'b t -> 'c -> 'c
end