// Copyright (C) 2003  Laboratoire d'Informatique de Paris 6 (LIP6),
// département Systèmes Répartis Coopératifs (SRC), Université Pierre
// et Marie Curie.
//
// This file is part of Spot, a model checking library.
//
// Spot 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.
//
// Spot 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 Spot; see the file COPYING.  If not, write to the Free
// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.

#include "statebdd.hh"
#include <bdd.h>
#include <cassert>

namespace spot
{

  int
  state_bdd::compare(const state* other) const
  {
    // This method should not be called to compare states from different
    // automata, and all states from the same automaton will use the same
    // state class.
    const state_bdd* o = dynamic_cast<const state_bdd*>(other);
    assert(o);
    return o->as_bdd().id() - state_.id();
  }

  size_t
  state_bdd::hash() const
  {
    return state_.id();
  }

  /// Duplicate a state.
  state_bdd*
  state_bdd::clone() const
  {
    return new state_bdd(*this);
  }

}