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// Profiling iterator implementation -*- C++ -*-
// Copyright (C) 2009-2018 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 _GLIBCXX_VISIBILITY(default)
{
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() _GLIBCXX_NOEXCEPT
: _M_current(), _M_ds(0) { }
__iterator_tracker(const _Iterator& __i, const _Sequence* __seq)
_GLIBCXX_NOEXCEPT
: _M_current(__i), _M_ds(__seq) { }
__iterator_tracker(const __iterator_tracker& __x) _GLIBCXX_NOEXCEPT
: _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) _GLIBCXX_NOEXCEPT
: _M_current(__x.base()), _M_ds(__x._M_get_sequence()) { }
_Iterator
base() const _GLIBCXX_NOEXCEPT { return _M_current; }
/**
* @brief Conversion to underlying non-debug iterator to allow
* better interaction with non-profile containers.
*/
operator _Iterator() const _GLIBCXX_NOEXCEPT { return _M_current; }
pointer
operator->() const _GLIBCXX_NOEXCEPT { return &*_M_current; }
__iterator_tracker&
operator++() _GLIBCXX_NOEXCEPT
{
_M_ds->_M_profile_iterate();
++_M_current;
return *this;
}
__iterator_tracker
operator++(int) _GLIBCXX_NOEXCEPT
{
_M_ds->_M_profile_iterate();
__iterator_tracker __tmp(*this);
++_M_current;
return __tmp;
}
__iterator_tracker&
operator--() _GLIBCXX_NOEXCEPT
{
_M_ds->_M_profile_iterate(1);
--_M_current;
return *this;
}
__iterator_tracker
operator--(int) _GLIBCXX_NOEXCEPT
{
_M_ds->_M_profile_iterate(1);
__iterator_tracker __tmp(*this);
--_M_current;
return __tmp;
}
__iterator_tracker&
operator=(const __iterator_tracker& __x) _GLIBCXX_NOEXCEPT
{
_M_current = __x._M_current;
_M_ds = __x._M_ds;
return *this;
}
reference
operator*() const _GLIBCXX_NOEXCEPT
{ return *_M_current; }
// ------ Random access iterator requirements ------
reference
operator[](const difference_type& __n) const _GLIBCXX_NOEXCEPT
{ return _M_current[__n]; }
__iterator_tracker&
operator+=(const difference_type& __n) _GLIBCXX_NOEXCEPT
{
_M_current += __n;
return *this;
}
__iterator_tracker
operator+(const difference_type& __n) const _GLIBCXX_NOEXCEPT
{
__iterator_tracker __tmp(*this);
__tmp += __n;
return __tmp;
}
__iterator_tracker&
operator-=(const difference_type& __n) _GLIBCXX_NOEXCEPT
{
_M_current += -__n;
return *this;
}
__iterator_tracker
operator-(const difference_type& __n) const _GLIBCXX_NOEXCEPT
{
__iterator_tracker __tmp(*this);
__tmp -= __n;
return __tmp;
}
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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ 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)
_GLIBCXX_NOEXCEPT
{ return __i + __n; }
} // namespace __profile
} // namespace std
#endif
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