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// Profiling iterator implementation -*- C++ -*-

// Copyright (C) 2009, 2010 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 profile/iterator_tracker.h

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

 */

#ifndef _GLIBCXX_PROFILE_ITERATOR_TRACKER

#define _GLIBCXX_PROFILE_ITERATOR_TRACKER 1

#include <ext/type_traits.h>

namespace std

{

namespace __profile

{

template<typename _Iterator, typename _Sequence>

class __iterator_tracker

{

  typedef __iterator_tracker _Self;

  // The underlying iterator

  _Iterator _M_current;

  // The underlying data structure

  const _Sequence* _M_ds;

  typedef std::iterator_traits<_Iterator> _Traits;

 public:

  typedef _Iterator                           _Base_iterator;

  typedef typename _Traits::iterator_category iterator_category;

  typedef typename _Traits::value_type        value_type;

  typedef typename _Traits::difference_type   difference_type;

  typedef typename _Traits::reference         reference;

  typedef typename _Traits::pointer           pointer;

  __iterator_tracker() : _M_current(), _M_ds(0) { }

  __iterator_tracker(const _Iterator& __i, const _Sequence* seq)

      : _M_current(__i), _M_ds(seq) { }

  __iterator_tracker(const __iterator_tracker& __x)

      : _M_current(__x._M_current), _M_ds(__x._M_ds) { }

  template<typename _MutableIterator>

  __iterator_tracker(const __iterator_tracker<_MutableIterator, typename __gnu_cxx::__enable_if<(std::__are_same<_MutableIterator, typename _Sequence::iterator::_Base_iterator>::__value), _Sequence>::__type>& __x)

      :  _M_current(__x.base()), _M_ds(__x._M_get_sequence()) { }

  _Iterator

  base() const { return _M_current; }

  /**

   * @brief Conversion to underlying non-debug iterator to allow

   * better interaction with non-profile containers.

   */

  operator _Iterator() const { return _M_current; }

  pointer

  operator->() const { return &*_M_current; }

  __iterator_tracker&

  operator++()

  {

    _M_ds->_M_profile_iterate();

    ++_M_current;

    return *this;

  }

  __iterator_tracker&

  operator++(int)

  {

    _M_ds->_M_profile_iterate();

    __iterator_tracker __tmp(*this);

    ++_M_current;

    return __tmp;

  }

  __iterator_tracker&

  operator--()

  {

    _M_ds->_M_profile_iterate(1);

    --_M_current;

    return *this;

  }

  __iterator_tracker&

  operator--(int)

  {

    _M_ds->_M_profile_iterate(1);

    __iterator_tracker __tmp(*this);

    --_M_current;

    return __tmp;

  }

  __iterator_tracker&

  operator=(const __iterator_tracker& __x)

  {

    _M_current = __x._M_current;

    return *this;

  }

  reference

  operator*() const

  {

    return *_M_current;

  }

 // ------ Random access iterator requirements ------

  reference

  operator[](const difference_type& __n) const

  {

    return _M_current[__n];

  }

  __iterator_tracker&

  operator+=(const difference_type& __n)

  {

    _M_current += __n;

    return *this;

  }

  __iterator_tracker

  operator+(const difference_type& __n) const

  {

    __iterator_tracker __tmp(*this);

    __tmp += __n;

    return __tmp;

  }

  __iterator_tracker&

  operator-=(const difference_type& __n)

  {

    _M_current += -__n;

    return *this;

  }

  __iterator_tracker

  operator-(const difference_type& __n) const

  {

    __iterator_tracker __tmp(*this);

    __tmp -= __n;

    return __tmp;

  }

  void

  _M_find()

  {

    _M_ds->_M_profile_find();

  }

  const _Sequence*

  _M_get_sequence() const

  {

    return static_cast<const _Sequence*>(_M_ds);

  }

};

template<typename _IteratorL, typename _IteratorR, typename _Sequence>

inline bool

operator==(const __iterator_tracker<_IteratorL, _Sequence>& __lhs,

           const __iterator_tracker<_IteratorR, _Sequence>& __rhs)

{

  return __lhs.base() == __rhs.base();

}

template<typename _Iterator, typename _Sequence>

inline bool

operator==(const __iterator_tracker<_Iterator, _Sequence>& __lhs,

           const __iterator_tracker<_Iterator, _Sequence>& __rhs)

{

  return __lhs.base() == __rhs.base();

}

template<typename _IteratorL, typename _IteratorR, typename _Sequence>

inline bool

operator!=(const __iterator_tracker<_IteratorL, _Sequence>& __lhs,

           const __iterator_tracker<_IteratorR, _Sequence>& __rhs)

{

  return __lhs.base() != __rhs.base();

}

template<typename _Iterator, typename _Sequence>

inline bool

operator!=(const __iterator_tracker<_Iterator, _Sequence>& __lhs,

               const __iterator_tracker<_Iterator, _Sequence>& __rhs)

{

  return __lhs.base() != __rhs.base();

}

template<typename _IteratorL, typename _IteratorR, typename _Sequence>

inline bool

operator<(const __iterator_tracker<_IteratorL, _Sequence>& __lhs,

          const __iterator_tracker<_IteratorR, _Sequence>& __rhs)

{

  return __lhs.base() < __rhs.base();

}

template<typename _Iterator, typename _Sequence>

inline bool

operator<(const __iterator_tracker<_Iterator, _Sequence>& __lhs,

          const __iterator_tracker<_Iterator, _Sequence>& __rhs)

{

  return __lhs.base() < __rhs.base();

}

template<typename _IteratorL, typename _IteratorR, typename _Sequence>

inline bool

operator<=(const __iterator_tracker<_IteratorL, _Sequence>& __lhs,

           const __iterator_tracker<_IteratorR, _Sequence>& __rhs)

{

  return __lhs.base() <= __rhs.base();

}

template<typename _Iterator, typename _Sequence>

inline bool

operator<=(const __iterator_tracker<_Iterator, _Sequence>& __lhs,

           const __iterator_tracker<_Iterator, _Sequence>& __rhs)

{

  return __lhs.base() <= __rhs.base();

}

template<typename _IteratorL, typename _IteratorR, typename _Sequence>

inline bool

operator>(const __iterator_tracker<_IteratorL, _Sequence>& __lhs,

          const __iterator_tracker<_IteratorR, _Sequence>& __rhs)

{

  return __lhs.base() > __rhs.base();

}

template<typename _Iterator, typename _Sequence>

inline bool

operator>(const __iterator_tracker<_Iterator, _Sequence>& __lhs,

          const __iterator_tracker<_Iterator, _Sequence>& __rhs)

{

  return __lhs.base() > __rhs.base();

}

template<typename _IteratorL, typename _IteratorR, typename _Sequence>

inline bool

operator>=(const __iterator_tracker<_IteratorL, _Sequence>& __lhs,

           const __iterator_tracker<_IteratorR, _Sequence>& __rhs)

{

  return __lhs.base() >= __rhs.base();

}

template<typename _Iterator, typename _Sequence>

inline bool

operator>=(const __iterator_tracker<_Iterator, _Sequence>& __lhs,

           const __iterator_tracker<_Iterator, _Sequence>& __rhs)

{

  return __lhs.base() >= __rhs.base();

}

// _GLIBCXX_RESOLVE_LIB_DEFECTS

// According to the resolution of DR179 not only the various comparison

// operators but also operator- must accept mixed iterator/const_iterator

// parameters.

  template<typename _IteratorL, typename _IteratorR, typename _Sequence>

  inline typename __iterator_tracker<_IteratorL, _Sequence>::difference_type

  operator-(const __iterator_tracker<_IteratorL, _Sequence>& __lhs,

            const __iterator_tracker<_IteratorR, _Sequence>& __rhs)

{

  return __lhs.base() - __rhs.base();

}

template<typename _Iterator, typename _Sequence>

inline typename __iterator_tracker<_Iterator, _Sequence>::difference_type

operator-(const __iterator_tracker<_Iterator, _Sequence>& __lhs,

          const __iterator_tracker<_Iterator, _Sequence>& __rhs)

{

  return __lhs.base() - __rhs.base();

}

template<typename _Iterator, typename _Sequence>

inline __iterator_tracker<_Iterator, _Sequence>

operator+(typename __iterator_tracker<_Iterator,_Sequence>::difference_type

          __n,

          const __iterator_tracker<_Iterator, _Sequence>& __i)

{

  return __i + __n;

}

}  // namespace __profile

}  // namespace std

#endif