listg/iterator.hh

// iterator.hh: this file is part of the Vaucanson project.
//
// Vaucanson, a generic library for finite state machines.
//
// Copyright (C) 2008 The Vaucanson Group.
//
// 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.
//
// The complete GNU General Public Licence Notice can be found as the
// `COPYING' file in the root directory.
//
// The Vaucanson Group consists of people listed in the `AUTHORS' file.
//
#ifndef VAUCANSON_AUTOMATA_IMPLEMENTATION_LISTG_ITERATOR_HH
# define VAUCANSON_AUTOMATA_IMPLEMENTATION_LISTG_ITERATOR_HH

# include <set>

namespace vcsn
{
  namespace listg
  {
    class backward_iterator { };
    class forward_iterator { };

    template <typename Graph, typename Direction>
    class DeltaConstIterator
    {
      public:
        typedef Graph                                           graph_type;
        typedef std::set<typename graph_type::htransition_t>    container_type;
        typedef typename container_type::iterator               iterator_type;
        typedef Direction                                       direction;
        typedef DeltaConstIterator<Graph, Direction>            self_t;

        DeltaConstIterator(const graph_type& g, typename graph_type::hstate_t s);
        ~DeltaConstIterator();

        void            next();
        bool            done() const;

        typename graph_type::htransition_t      operator*() const;

      private:
        const graph_type&               graph_;
        typename graph_type::hstate_t   s_;
        iterator_type                   i_;
        iterator_type                   end_;

        /*
        ** Internal use
        ** Initialize the i_ and end_ based on whether we want to iterate
        ** over the successors or the predecessors.
        */
        void            initialize(const backward_iterator&);
        void            initialize(const forward_iterator&);

    }; // End of class DeltaConstIterator

  } // End of namespace listg

} // End of namespace vcsn

# if !defined VCSN_USE_INTERFACE_ONLY
#  include <vaucanson/automata/implementation/listg/iterator.hxx>
# endif // ! VCSN_USE_INTERFACE_ONLY

#endif // ! VAUCANSON_AUTOMATA_IMPLEMENTATION_LISTG_ITERATOR_HH