src/uid.ml

   1 (***********************************************************************)
   2 (*                                                                     *)
   3 (*                               TAToo                                 *)
   4 (*                                                                     *)
   5 (*                     Kim Nguyen, LRI UMR8623                         *)
   6 (*                   Université Paris-Sud & CNRS                       *)
   7 (*                                                                     *)
   8 (*  Copyright 2010-2012 Université Paris-Sud and Centre National de la *)
   9 (*  Recherche Scientifique. All rights reserved.  This file is         *)
  10 (*  distributed under the terms of the GNU Lesser General Public       *)
  11 (*  License, with the special exception on linking described in file   *)
  12 (*  ../LICENSE.                                                        *)
  13 (*                                                                     *)
  14 (***********************************************************************)
  15
  16 type t = int
  17
  18 exception Overflow
  19 let make_maker () =
  20   let _id = ref ~-1 in
  21     fun () ->
  22       incr _id;
  23       let i = !_id in
  24       if i < 0 then raise Overflow else i
  25
  26 let dummy = -1
  27
  28 external to_int : t -> int = "%identity"
  29 external of_int : int -> t= "%identity"