// Copyright (c) 1997
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel).  All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v5.6.1/Stream_support/include/CGAL/IO/Ostream_iterator.h $
// $Id: Ostream_iterator.h 580a1ef 2020-05-22T15:31:50+02:00 Mael Rouxel-Labbé
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Lutz Kettner  <kettner@inf.ethz.ch>

#ifndef CGAL_IO_OSTREAM_ITERATOR_H
#define CGAL_IO_OSTREAM_ITERATOR_H

#include <CGAL/circulator.h>

namespace CGAL {
namespace Stream_support {
namespace internal {

// This proxy is for the Ostream_iterator.
template <class T, class Stream>
class Ostream_proxy
{
  Stream& stream;
public:
  Ostream_proxy(Stream& s) : stream(s) {}
  Ostream_proxy<T, Stream>& operator=( const T& t)
  {
    stream << t;
    return *this;
  }
};

} // namespace Stream_support
} // namespace internal

/*!
\ingroup PkgStreamSupportRef

The class `Ostream_iterator` is an output iterator adaptor for the
output stream class `Stream` and value type `T`.

\cgalModels `OutputIterator`

\cgalHeading{Implementation}

The `operator*()` in class `Ostream_iterator` uses a proxy class.
*/
template <class T, class Stream>
class Ostream_iterator
{
  Stream* stream;

public:
  typedef T                                                   value_type;
  typedef T&                                                  reference;
  typedef const T&                                            const_reference;
  typedef T*                                                  pointer;
  typedef const T*                                            const_pointer;
  typedef std::ptrdiff_t                                      difference_type;
  typedef std::output_iterator_tag                            iterator_category;
  typedef Stream_support::internal::Ostream_proxy<T, Stream>  Ostream_proxy;

  /// \name Creation
  /// @{

  /*!
  creates an output iterator writing to `s`.
  */
  Ostream_iterator(Stream& s) : stream(&s) {}

  /// @}

  Ostream_iterator<T,Stream>& operator++() { return *this;}
  Ostream_iterator<T,Stream> operator++(int) { return *this;}

  Ostream_proxy operator*() const { return Ostream_proxy(*stream); }
};

} // namespace CGAL

#endif // CGAL_IO_OSTREAM_ITERATOR_H

