// Copyright (c) 2006 Foundation for Research and Technology-Hellas (Greece).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you may redistribute it under
// the terms of the Q Public License version 1.0.
// See the file LICENSE.QPL distributed with CGAL.
//
// 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: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.4-branch/Voronoi_diagram_2/include/CGAL/Voronoi_diagram_2/Adaptation_traits_functors.h $
// $Id: Adaptation_traits_functors.h 29163 2006-03-07 23:41:02Z mkaravel $
// 
//
// Author(s)     : Menelaos Karavelas <mkaravel@iacm.forth.gr>

#ifndef CGAL_VORONOI_DIAGRAM_2_ADAPTATION_TRAITS_FUNCTORS_H
#define CGAL_VORONOI_DIAGRAM_2_ADAPTATION_TRAITS_FUNCTORS_H 1

#include <CGAL/Voronoi_diagram_2/basic.h>

CGAL_BEGIN_NAMESPACE

CGAL_VORONOI_DIAGRAM_2_BEGIN_NAMESPACE

//=========================================================================
//=========================================================================

struct Null_functor
{
  Null_functor() {}
  template<typename T> Null_functor(T t) {}
};

//=========================================================================

template<class Functor>
struct Functor_exists
{
  typedef Tag_true  Value;
};

template<>
struct Functor_exists<Null_functor>
{
  typedef Tag_false Value;
};

template<class AT, class SI> class Default_caching_site_inserter;

template<class AT>
struct Functor_exists< Default_caching_site_inserter<AT,Null_functor> >
{
  typedef Tag_false Value;
};

//=========================================================================
//=========================================================================


CGAL_VORONOI_DIAGRAM_2_END_NAMESPACE

CGAL_END_NAMESPACE


#endif // CGAL_VORONOI_DIAGRAM_2_ADAPTATION_TRAITS_FUNCTORS_H
