(***********************************************************************)
(*                                                                     *)
(*                               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.                                                        *)
(*                                                                     *)
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(*
  Time-stamp: <Last modified on 2013-01-30 19:06:33 CET by Kim Nguyen>
*)

(** This modules implements unique identifiers represented by integers *)

type t = private int
(** The type of unique identifiers. *)

exception Overflow
(** Raised when the internal counters for IDs overflows. *)

val make_maker : unit -> (unit -> t)
(** Returns an uid generator.
    [make_maker ()] returns a function that generates unique ids. Raises
    [Overflow] if the internal counter overflows.
*)

val dummy : t
(** A dummy identifier, guaranteed to be distinct from any value
    returned by a generator.
*)

external to_int : t -> int = "%identity"
(** Convert a unique id to an integer *)

(**/**)

external of_int : int -> t = "%identity"
(** May break the invariant, use with caution *)