// 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 "formula.hh"

namespace spot
{
  namespace ltl
  {
    formula*
    formula::ref()
    {
      ref_();
      return this;
    }

    formula::~formula()
    {
    }

    void
    formula::unref(formula* f)
    {
      if (f->unref_())
	delete f;
    }

    void
    formula::ref_()
    {
      // Not reference counted by default.
    }

    bool
    formula::unref_()
    {
      // Not reference counted by default.
      return false;
    }
  }
}