Module Ptmap

type +'a t
type key = int
val empty : 'a t
val is_empty : 'a t -> bool
val add : int -> 'a -> 'a t -> 'a t
val find : int -> 'a t -> 'a
val remove : int -> 'a t -> 'a t
val mem : int -> 'a t -> bool
val iter : (int -> 'a -> unit) -> 'a t -> unit
val map : ('a -> 'b) -> 'a t -> 'b t
val mapi : (int -> 'a -> 'b) -> 'a t -> 'b t
val fold : (int -> '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