-(** Signature of a simple HashSet module *)
-module type Set =
-sig
- type elt
- type t
- val empty : t
- val is_empty : t -> bool
- val mem : elt -> t -> bool
- val add : elt -> t -> t
- val singleton : elt -> t
- val remove : elt -> t -> t
- val union : t -> t -> t
- val inter : t -> t -> t
- val diff : t -> t -> t
- val compare : t -> t -> int
- val equal : t -> t -> bool
- val subset : t -> t -> bool
- val iter : (elt -> unit) -> t -> unit
- val fold : (elt -> 'a -> 'a) -> t -> 'a -> 'a
- val for_all : (elt -> bool) -> t -> bool
- val exists : (elt -> bool) -> t -> bool
- val filter : (elt -> bool) -> t -> t
- val partition : (elt -> bool) -> t -> t * t
- val cardinal : t -> int
- val elements : t -> elt list
- val min_elt : t -> elt
- val max_elt : t -> elt
- val choose : t -> elt
- val split : elt -> t -> t * bool * t
- val intersect : t -> t -> bool
- val is_singleton : t -> bool
- val from_list : elt list -> t
+
+module HCONS =
+struct
+ (** Abstract signature of a module implementing an hashconsed datatype *)
+ module type Abstract =
+ sig
+
+ (** The type of the data to be hash-consed *)
+ type data
+
+ (** The type of hashconsed data *)
+ type t
+
+ (** [make v] internalizes the value [v], making it an hashconsed
+ value.
+ *)
+ val make : data -> t
+
+ (** [node h] extract the original data from its hashconsed value
+ *)
+ val node : t -> data
+
+ (** [hash h] returns a hash of [h], such that for every [h1] and
+ [h2], [equal h1 h2] implies [hash h1 = hash h2].
+ *)
+ val hash : t -> int
+
+ (** [uid h] returns a unique identifier *)
+ val uid : t -> Uid.t
+
+ (** Equality between hashconsed values. Equivalent to [==] *)
+ val equal : t -> t -> bool
+
+
+ (** Initializes the internal storage. Any previously hashconsed
+ element is discarded. *)
+ val init : unit -> unit
+ end
+
+
+ (** Concrete signature of a module implementing an hashconsed datatype *)
+ module type S =
+ sig
+ type data
+ type t = private { id : Uid.t;
+ hash : int;
+ node : data }
+ include Abstract with type data := data and type t := t
+ end
+
+end
+
+
+module PTSET =
+struct
+ module type S =
+ sig
+ include HCONS.S
+ include AUX.Set with type t := t
+ end