// Copyright (c) 1999  INRIA Sophia-Antipolis (France).
// 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.
//
// $URL$
// $Id$
//
// Author(s)     : Monique Teillaud <Monique.Teillaud@sophia.inria.fr>
//                 Sylvain Pion

// cell of a triangulation of any dimension <=3

#ifndef CGAL_TRIANGULATION_CELL_BASE_3_H
#define CGAL_TRIANGULATION_CELL_BASE_3_H

#include <CGAL/basic.h>
#include <CGAL/triangulation_assertions.h>
#include <CGAL/Triangulation_ds_cell_base_3.h>

namespace CGAL {

template < typename GT, typename Cb = Triangulation_ds_cell_base_3<> >
class Triangulation_cell_base_3
  : public Cb
{
public:
  typedef typename Cb::Vertex_handle                   Vertex_handle;
  typedef typename Cb::Cell_handle                     Cell_handle;

  typedef GT                                           Geom_traits;
  typedef typename Geom_traits::Point_3                Point;

  typedef Point*           Point_container;
  typedef Point*           Point_iterator;
  typedef const Point*     Point_const_iterator;

  template < typename TDS2 >
  struct Rebind_TDS {
    typedef typename Cb::template Rebind_TDS<TDS2>::Other  Cb2;
    typedef Triangulation_cell_base_3<GT, Cb2>             Other;
  };

  Triangulation_cell_base_3()
    : Cb() {}

  Triangulation_cell_base_3(Vertex_handle v0, Vertex_handle v1,
                            Vertex_handle v2, Vertex_handle v3)
    : Cb(v0, v1, v2, v3) {}

  Triangulation_cell_base_3(Vertex_handle v0, Vertex_handle v1,
                            Vertex_handle v2, Vertex_handle v3,
                            Cell_handle   n0, Cell_handle   n1,
                            Cell_handle   n2, Cell_handle   n3)
    : Cb(v0, v1, v2, v3, n0, n1, n2, n3) {}

  Point_iterator hidden_points_begin() const { return hidden_points_end(); }
  Point_iterator hidden_points_end() const { return NULL; }
  void hide_point (const Point &) const { }

  // note the circumcenter() function is not part of the concept TriangulationCellBase_3
  // it is requested only by DelaunayTriangulartionCellBase_3
  // we keep it here for backward compatibility
  typename Geom_traits::Point_3
  circumcenter(const Geom_traits& gt = Geom_traits()) const
  {
      return gt.construct_circumcenter_3_object()(this->vertex(0)->point(),
                                                  this->vertex(1)->point(),
                                                  this->vertex(2)->point(),
                                                  this->vertex(3)->point());
  }

};

// The following should be useless.
#if 0
template < class GT, class Cb >
inline
std::istream&
operator>>(std::istream &is, Triangulation_cell_base_3<GT, Cb> &c)
  // non combinatorial information. Default = nothing
{
  return is >> static_cast<Cb&>(c);
}

template < class GT, class Cb >
inline
std::ostream&
operator<<(std::ostream &os, const Triangulation_cell_base_3<GT, Cb> &c)
  // non combinatorial information. Default = nothing
{
  return os << static_cast<const Cb&>(c);
}
#endif

} //namespace CGAL

#endif // CGAL_TRIANGULATION_CELL_BASE_3_H
