(*
This file is part of the dpll(t) engine sammy
Copyright (C) 2005  The University of Iowa
Mike Decoster
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.
*)

exception Modified_an_unmodifiable_annotation

class label : string*bool->
object
  method is_modifiable : bool
  method get_label : string
  method is_empty : bool
  method is_guard: bool
  method set_guard: bool -> unit
end

val empty_label : label

val set_label_guard : label -> bool -> label

val newlabel : string -> label
