// Copyright (c) 2000  Max-Planck-Institute Saarbruecken (Germany).
// 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.
//
// $Source: /CVSROOT/CGAL/Packages/Partition_2/include/CGAL/polygon_function_objects.h,v $
// $Revision: 1.9 $ $Date: 2003/10/21 12:22:29 $
// $Name:  $
//
// Author(s)     : Susan Hert <hert@mpi-sb.mpg.de>

#ifndef POLYGON_FUNCTION_OBJECTS_H
#define POLYGON_FUNCTION_OBJECTS_H

#include<CGAL/is_y_monotone_2.h>

namespace CGAL {

template <class Traits>
class Is_vacuously_valid 
{
  public:

     Is_vacuously_valid(Traits ) {}

     template <class ForwardIterator>
     bool operator()(ForwardIterator, ForwardIterator)
     {  return true; }

};


template <class Traits>
class Is_convex_2
{
  public:
     Is_convex_2(Traits t): traits(t) {}
  
     template <class ForwardIterator>
     bool operator()(ForwardIterator first, ForwardIterator last)
     {  return is_convex_2(first, last, traits); }

  private:
     Traits  traits;
};

template <class Traits>
class Is_y_monotone_2
{
  public:
     Is_y_monotone_2(Traits t): traits(t) {}
  
     template <class ForwardIterator>
     bool operator()(ForwardIterator first, ForwardIterator last)
     {  return is_y_monotone_2(first, last, traits); }

  private:
     Traits  traits;
};

}

#endif // POLYGON_FUNCTION_OBJECTS_H
