// Copyright (c) 2005-2006  INRIA Sophia-Antipolis (France).
// 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.
//
// Partially supported by the IST Programme of the EU as a Shared-cost
// RTD (FET Open) Project under Contract No  IST-2000-26473 
// (ECG - Effective Computational Geometry for Curves and Surfaces) 
// and a STREP (FET Open) Project under Contract No  IST-006413 
// (ACS -- Algorithms for Complex Shapes)
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/trunk/Algebraic_kernel_for_spheres/include/CGAL/Algebraic_kernel_for_spheres/internal_functions_comparison_root_for_spheres_2_3.h $
// $Id: internal_functions_comparison_root_for_spheres_2_3.h 46224 2008-10-13 11:22:46Z pmachado $
//
// Author(s) : Monique Teillaud <Monique.Teillaud@sophia.inria.fr>
//             Sylvain Pion
//             Pedro Machado

#ifndef CGAL_ALGEBRAIC_KERNEL_COMPARISON_ROOT_FOR_SPHERES_2_3_H
#define CGAL_ALGEBRAIC_KERNEL_COMPARISON_ROOT_FOR_SPHERES_2_3_H


namespace CGAL {
  namespace AlgebraicSphereFunctors{
  
    template <typename RT>
      Comparison_result 
      compare_x(const CGAL::Root_for_spheres_2_3<RT>& r1, const CGAL::Root_for_spheres_2_3<RT>& r2){
      return compare(r1.x(), r2.x());
    }
  
    template <typename RT>
      Comparison_result 
      compare_y(const CGAL::Root_for_spheres_2_3<RT>& r1, const CGAL::Root_for_spheres_2_3<RT>& r2){
      return compare(r1.y(), r2.y());
    }

    template <typename RT>
      Comparison_result 
      compare_z(const CGAL::Root_for_spheres_2_3<RT>& r1, const CGAL::Root_for_spheres_2_3<RT>& r2){
      return compare(r1.z(), r2.z());
    }
  
    template <typename RT>
      Comparison_result
      compare_xy(const CGAL::Root_for_spheres_2_3<RT>& r1, const CGAL::Root_for_spheres_2_3<RT>& r2){
      Comparison_result compx = compare_x(r1, r2);
      if(compx != 0)
	return compx;
      return compare_y(r1, r2);
    }

     template <typename RT>
      Comparison_result
      compare_xyz(const CGAL::Root_for_spheres_2_3<RT>& r1, const CGAL::Root_for_spheres_2_3<RT>& r2){
      Comparison_result compxy = compare_xy(r1, r2);
      if(compxy != 0)
	return compxy;
      return compare_z(r1, r2);
    }


  } // namespace AlgebraicSphereFunctors
} // namespace CGAL

#endif // CGAL_ALGEBRAIC_KERNEL_COMPARISON_ROOT_FOR_SPHERES_2_3_H
