// Copyright (C) 2012 Laboratoire de Recherche et Developpement de
// l'Epita (LRDE).
//
// 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 3 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 this program.  If not, see <http://www.gnu.org/licenses/>.

#ifndef SPOT_TGBAALGOS_ISWEAKSCC_HH
# define SPOT_TGBAALGOS_ISWEAKSCC_HH

#include "scc.hh"

namespace spot
{
  /// \addtogroup tgba_misc
  /// @{

  /// \brief Whether the SCC number \a scc in \a map is weak.
  ///
  /// An SCC is weak if either its cycles are all accepting, or they
  /// are all non-accepting.
  ///
  /// The scc_map \a map should have been built already.  The absence
  /// of accepting cycle is easy to check (the scc_map can tell
  /// whether the SCC is non-accepting already).  Similarly, an SCC in
  /// which all transitions belong to all acceptance sets is
  /// necessarily weak.
  /// For other accepting SCCs, this function enumerates all cycles in
  /// the given SCC (it stops if it find a non-accepting cycle).
  bool is_weak_scc(scc_map& map, unsigned scc);

  /// @}
}


#endif // SPOT_TGBAALGOS_ISWEAKSCC_HH