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// -*- C++ -*-

// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; 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, or (at your option) any later

// version.

// This library is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

/** @file parallel/iterator.h

 * @brief Helper iterator classes for the std::transform() functions.

 *  This file is a GNU parallel extension to the Standard C++ Library.

 */

// Written by Johannes Singler.

#ifndef _GLIBCXX_PARALLEL_ITERATOR_H

#define _GLIBCXX_PARALLEL_ITERATOR_H 1

#include <parallel/basic_iterator.h>

#include <bits/stl_pair.h>

namespace __gnu_parallel

{

  /** @brief A pair of iterators. The usual iterator operations are

   *  applied to both child iterators.

   */

  template<typename _Iterator1, typename _Iterator2,

           typename _IteratorCategory>

    class _IteratorPair : public std::pair<_Iterator1, _Iterator2>

    {

    private:

      typedef std::pair<_Iterator1, _Iterator2> _Base;

    public:

      typedef _IteratorCategory iterator_category;

      typedef void value_type;

      typedef std::iterator_traits<_Iterator1> _TraitsType;

      typedef typename _TraitsType::difference_type difference_type;

      typedef _IteratorPair* pointer;

      typedef _IteratorPair& reference;

      _IteratorPair() { }

      _IteratorPair(const _Iterator1& __first, const _Iterator2& __second)

      : _Base(__first, __second) { }

      // Pre-increment operator.

      _IteratorPair&

      operator++()

      {

        ++_Base::first;

        ++_Base::second;

        return *this;

      }

      // Post-increment operator.

      const _IteratorPair

      operator++(int)

      { return _IteratorPair(_Base::first++, _Base::second++); }

      // Pre-decrement operator.

      _IteratorPair&

      operator--()

      {

        --_Base::first;

        --_Base::second;

        return *this;

      }

      // Post-decrement operator.

      const _IteratorPair

      operator--(int)

      { return _IteratorPair(_Base::first--, _Base::second--); }

      // Type conversion.

      operator _Iterator2() const

      { return _Base::second; }

      _IteratorPair&

      operator=(const _IteratorPair& __other)

      {

        _Base::first = __other.first;

        _Base::second = __other.second;

        return *this;

      }

      _IteratorPair

      operator+(difference_type __delta) const

      { return _IteratorPair(_Base::first + __delta, _Base::second + __delta);

        }

      difference_type

      operator-(const _IteratorPair& __other) const

      { return _Base::first - __other.first; }

  };

  /** @brief A triple of iterators. The usual iterator operations are

      applied to all three child iterators.

   */

  template<typename _Iterator1, typename _Iterator2, typename _Iterator3,

           typename _IteratorCategory>

    class _IteratorTriple

    {

    public:

      typedef _IteratorCategory iterator_category;

      typedef void value_type;

      typedef typename std::iterator_traits<_Iterator1>::difference_type

                                                            difference_type;

      typedef _IteratorTriple* pointer;

      typedef _IteratorTriple& reference;

      _Iterator1 _M_first;

      _Iterator2 _M_second;

      _Iterator3 _M_third;

      _IteratorTriple() { }

      _IteratorTriple(const _Iterator1& __first, const _Iterator2& __second,

                      const _Iterator3& __third)

      {

        _M_first = __first;

        _M_second = __second;

        _M_third = __third;

      }

      // Pre-increment operator.

      _IteratorTriple&

      operator++()

      {

        ++_M_first;

        ++_M_second;

        ++_M_third;

        return *this;

      }

      // Post-increment operator.

      const _IteratorTriple

      operator++(int)

      { return _IteratorTriple(_M_first++, _M_second++, _M_third++); }

      // Pre-decrement operator.

      _IteratorTriple&

      operator--()

      {

        --_M_first;

        --_M_second;

        --_M_third;

        return *this;

      }

      // Post-decrement operator.

      const _IteratorTriple

      operator--(int)

      { return _IteratorTriple(_M_first--, _M_second--, _M_third--); }

      // Type conversion.

      operator _Iterator3() const

      { return _M_third; }

      _IteratorTriple&

      operator=(const _IteratorTriple& __other)

      {

        _M_first = __other._M_first;

        _M_second = __other._M_second;

        _M_third = __other._M_third;

        return *this;

      }

      _IteratorTriple

      operator+(difference_type __delta) const

      { return _IteratorTriple(_M_first + __delta, _M_second + __delta,

                               _M_third + __delta); }

      difference_type

      operator-(const _IteratorTriple& __other) const

      { return _M_first - __other._M_first; }

  };

}

#endif /* _GLIBCXX_PARALLEL_ITERATOR_H */