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+(***********************************************************************)
+(*                                                                     *)
+(*                               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 23:05:14 CET by Kim Nguyen>
+*)
+
+(** Implementation of generic hashconsing. *)
+
+include module type of Hcons_sig
+
+(** Output signature of the functor {!Hcons.Make} *)
+
+module Make (H : Common_sig.HashedType) : S with type data = H.t
+(** Functor building an implementation of hashconsed values for a given
+    implementation of {!Common_sig.HashedType}. Hashconsed values are
+    persistent: the are kept in memory even if no external reference
+    remain. Calling [init()] explicitely will reclaim the space.
+*)
+
+module Weak (H : Common_sig.HashedType) : S with type data = H.t
+(** Functor building an implementation of hashconsed values for a given
+    implementation of {!Common_sig.HashedType}. Hashconsed values have a
+    weak semantics: they may be reclaimed as soon as no external
+    reference to them exists. The space may still be reclaimed
+    explicitely by calling [init].
+*)
+
+module PosInt : Abstract with type data = int and type t = int
+(** Compact implementation of hashconsed positive integer that
+    avoids boxing. [PosInt.make v] raises [Invalid_argument] if
+    [ v < 0 ]
+*)