(***********************************************************************)
(*                                                                     *)
(*                               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.                                                        *)
(*                                                                     *)
(***********************************************************************)

open Format
include Hcons.PosInt

let next =
  let id = ref ~-1 in
    fun () -> incr id; make !id

let compare (a : t) (b : t) = (a :> int) - (b :> int)

let print fmt (x : t) = fprintf fmt "q%a" Pretty.pp_subscript (x :> int)

let dummy_state = make max_int