// Copyright (c) 1997  ETH Zurich (Switzerland).
// 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)     : Gabriele Neyer

#ifndef CGAL_TREE_TRAITS_H
#define CGAL_TREE_TRAITS_H

// Implementation of a minimal tree traits for CGAL trees, derived 
// from Tree_base.h
// (e.g. Range_tree_d.h and Segment_tree_d.h).
// Any other interface must at least provide the interface of this class.

namespace CGAL {

// Interface as it is expected for one layer of a Range Tree
template<class C_Data, class C_Window, class C_Key,          
         class C_Data_func, class C_Window_left_func, 
	 class C_Window_right_func, class C_Compare>
class tree_point_traits{
 public:
  typedef  C_Key Key;
  typedef  C_Data Data;
  typedef  C_Window Window;
  typedef  C_Compare Compare;

   C_Key get_key(const  C_Data&  dt)
    const {return  C_Data_func()(dt);}
   C_Key get_left(const  C_Window& dt)
    const {return  C_Window_left_func()(dt);}
   C_Key get_right(const  C_Window& dt)
    const {return  C_Window_right_func()(dt);}

  static bool comp( C_Key const& key1,  C_Key const& key2) 
  {return  C_Compare()(key1, key2);} 
  static bool key_comp( C_Data const& data1,  C_Data const& data2)
  {
    const Key d1= C_Data_func()(data1);
    const Key d2= C_Data_func()(data2);
    return  C_Compare()(d1,d2);
  }
};


// Interface as it is expected for one layer of a Segment Tree
template<class C_Data, class C_Window, class C_Key,  
         class C_Data_left_func, class C_Data_right_func, 
	 class C_Window_left_func, class C_Window_right_func, class C_Compare>
class tree_interval_traits{
 public:
  typedef  C_Data Data;
  typedef  C_Window Window;
  typedef  C_Key Key;
  typedef  C_Compare Compare;
  
   C_Key get_left(const  C_Data&  dt)
    const {return  C_Data_left_func()(dt);}
   C_Key get_right(const  C_Data& dt)
    const {return  C_Data_right_func()(dt);}
   C_Key get_left_win(const  C_Window& dt)
    const {return  C_Window_left_func()(dt);}
   C_Key get_right_win(const  C_Window& dt)
    const {return  C_Window_right_func()(dt);}

  static bool comp( C_Key const& key1,  C_Key const& key2) 
    {return  C_Compare()(key1, key2);} 
};

} //namespace CGAL

#endif
