text: // Copyright (c) 2019 Tel-Aviv University (Israel).
  // All rights reserved.
  //
  // This file is part of CGAL (www.cgal.org).
  // 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.
  //
  // Licensees holding a valid commercial license may use this file in
  // accordance with the commercial license agreement provided with the software.
  //
  // This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  // WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  //
  // $URL$
  // $Id$
  // SPDX-License-Identifier: GPL-3.0+
  //
  // Author(s) : Ron Wein         <wein@post.tau.ac.il>
  //             Ophir Setter     <ophirset@post.tau.ac.il>
  //             Sebastien Loriot <sebastien.loriot@cgal.org>
  //             Efi Fogel        <efifogel@gmail.com>
  
  #ifndef CGAL_GRAPH_TRAITS_DUAL_ARRANGEMENT_2_H
  #define CGAL_GRAPH_TRAITS_DUAL_ARRANGEMENT_2_H
  
  #include <CGAL/license/Arrangement_on_surface_2.h>
  
  /*! \file
   * Definition of:
   * 1. the specialized Dual<Arrangement_2> class,
   * 2. the specialized boost::graph_traits<Dual<Arrangement_2> >class,
   * 3. The free functions required by the various graph concepts.
   */
  
  // include this to avoid a VC15 warning
  #include <CGAL/boost/graph/named_function_params.h>
  
  #include <CGAL/Arrangement_2.h>
  #include <CGAL/Arrangement_2/graph_traits_dual.h>
  #include <CGAL/disable_warnings.h>
  
  namespace CGAL {
  
  // The specialized Dual<Arrangement_2... class template.
  template <typename GeomTraits_2, typename Dcel>
  class Dual<Arrangement_2<GeomTraits_2, Dcel> > :
      public Dual_arrangement_on_surface<Arrangement_2<GeomTraits_2, Dcel> >
  {
  public:
    typedef Arrangement_2<GeomTraits_2, Dcel>               Arrangement;
    typedef typename Arrangement::Geometry_traits_2         Geometry_traits_2;
    typedef typename Arrangement::Topology_traits           Topology_traits;
  
  private:
    typedef Dual_arrangement_on_surface<Arrangement>        Base;
  
  public:
    /*! Default constructor. */
    Dual() : Base() {}
  
    /*! Constructor from an arrangement. */
    Dual(const Arrangement& arr) : Base(arr) {}
  };
  
  }
  
  namespace boost {
  
  // The specialized graph_traits<CGAL::Dual<CGAL::Arrangement_2... class template.
  template <typename GeomTraits_2, typename Dcel>
  class graph_traits<CGAL::Dual<CGAL::Arrangement_2<GeomTraits_2, Dcel> > > :
      public CGAL::Graph_traits_dual_arr_on_surface_impl<CGAL::Arrangement_2
                                                         <GeomTraits_2, Dcel> >
  {};
  
  }
  
  namespace CGAL {
  
  // Templates of free functions that handle
  //   graph_traits<CGAL::Dual<CGAL::Arrangement_2... class template.
  CGAL_DUAL_ARRANGEMENT_2_OUT_DEGREE(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_OUT_EDGES(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_SOURCE(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_TARGET(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_IN_DEGREE(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_IN_EDGES(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_DEGREE(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_NUM_VERTICES(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_VERTICES(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_NUM_EDGES(Arrangement_2)
  CGAL_DUAL_ARRANGEMENT_2_EDGES(Arrangement_2)
  
  }
  
  #endif
  