(*
This file is part of the dpll(t) engine sammy
Copyright (C) 2004  The University of Iowa
Cesare Tinelli
George Hagen

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*)

(** Counter objects *)
(* counter.ml *)

(** A counter initialized to min_int *)
class counter =
object
  val mutable value = min_int

  method value = value

  method set n = value <- n

  method next = begin
    value <- value + 1;
    value
  end
end

(** A counter initialized to some user-defined value *)
class set_counter (init:int) =
object (self)
  inherit counter
  method set x = value <- x
  method next2 = begin
    value <- value + 2;
    value
  end
  initializer self#set init
end

