// Copyright (c) 2005  Tel-Aviv University (Israel).
// 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.
//
// $URL$
// $Id$
// 
//
// Author(s)     : Michal Meyerovitch     <gorgymic@post.tau.ac.il>

#ifndef CGAL_ENVELOPE_SET_DIVIDORS_H
#define CGAL_ENVELOPE_SET_DIVIDORS_H

#include <iostream>

CGAL_BEGIN_NAMESPACE

class Arbitrary_dividor
{
public:

  template <class InputIterator, class OutputIterator>
  void operator()(InputIterator begin, InputIterator end,
                  OutputIterator set1, OutputIterator set2)
  {
    bool set_first = true;
    for(; begin != end; ++begin, set_first = !set_first)
      if (set_first)
        *set1++ = *begin;
      else
        *set2++ = *begin;

  }
  
};

class Incremental_dividor
{
public:

  template <class InputIterator, class OutputIterator>
  void operator()(InputIterator begin, InputIterator end,
                  OutputIterator set1, OutputIterator set2)
  {
    std::size_t i, n = std::distance(begin, end);
    // all items but the last go to the first set
    for(i=0; i<(n-1); ++i, ++begin)
      *set1++ = *begin;
    // the last item goes to the second set
    *set2++ = *begin;
  }

};
CGAL_END_NAMESPACE

#endif