// Copyright (c) 1999  Max-Planck-Institute Saarbruecken (Germany).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v5.6.1/Convex_hull_2/include/CGAL/IO/Tee_for_output_iterator.h $
// $Id: Tee_for_output_iterator.h 319383c 2020-05-20T09:47:58+02:00 Laurent Rineau
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Stefan Schirra


#ifndef CGAL_IO_TEE_FOR_OUTPUT_ITERATOR_H
#define CGAL_IO_TEE_FOR_OUTPUT_ITERATOR_H

#include <CGAL/license/Convex_hull_2.h>


#include <CGAL/basic.h>
#include <iterator>
#include <vector>
#include <CGAL/Handle.h>

namespace CGAL {
template <class T> class _Tee_for_output_iterator_rep;

template <class OutputIterator, class T>
class Tee_for_output_iterator
  : public Handle
{
  typedef std::vector<T>                             container;
  typedef typename container::iterator               iterator;
  typedef T                                          value_type;
  typedef std::output_iterator_tag                   iterator_category;
  typedef std::iterator_traits<iterator>             iter_traits;
  typedef typename iter_traits::pointer              pointer;
  typedef typename iter_traits::reference            reference;

public:
  Tee_for_output_iterator(const OutputIterator& o) : o_it(o)
  {  PTR = (Rep*) new _Tee_for_output_iterator_rep<T>(); }

  Tee_for_output_iterator<OutputIterator,T>&
  operator=(const T& value)
  {
    ptr()->output_so_far.push_back(value);
    *o_it = value;
    return *this;
  }

  Tee_for_output_iterator<OutputIterator,T>&
  operator*()
  { return *this; }

  Tee_for_output_iterator<OutputIterator,T>&
  operator++()
  {
    ++o_it;
    return *this;
  }

  Tee_for_output_iterator<OutputIterator,T>
  operator++(int)
  {
    Tee_for_output_iterator<OutputIterator,T> tmp = *this;
    o_it++;
    return tmp;
  }

  iterator
  output_so_far_begin()
  { return ptr()->output_so_far.begin(); }

  iterator
  output_so_far_end()
  { return ptr()->output_so_far.end(); }

  OutputIterator&
  to_output_iterator()
  { return o_it; }

  _Tee_for_output_iterator_rep<T>*
  ptr()
  { return (_Tee_for_output_iterator_rep<T>*)PTR; }

protected:
  OutputIterator o_it;
};

template <class T>
class _Tee_for_output_iterator_rep : public Rep
{
public:
  std::vector<T> output_so_far;
};

} //namespace CGAL

#endif // CGAL_IO_TEE_FOR_OUTPUT_ITERATOR_H

