--- /dev/null
+(***********************************************************************)
+(* *)
+(* TAToo *)
+(* *)
+(* Kim Nguyen, LRI UMR8623 *)
+(* Université Paris-Sud & CNRS *)
+(* *)
+(* Copyright 2010-2012 Université Paris-Sud and Centre National de la *)
+(* Recherche Scientifique. All rights reserved. This file is *)
+(* distributed under the terms of the GNU Lesser General Public *)
+(* License, with the special exception on linking described in file *)
+(* ../LICENSE. *)
+(* *)
+(***********************************************************************)
+
+(*
+ Time-stamp: <Last modified on 2013-03-04 22:36:31 CET by Kim Nguyen>
+*)
+
+ (** 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
+
+ (** Create a dummy (non-hashconsed) node with a boggus identifer
+ and hash *)
+ val dummy : data -> t
+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