safe_iterator.tcc
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// Debugging iterator implementation (out of line) -*- C++ -*-
// Copyright (C) 2003-2016 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 debug/safe_iterator.tcc
* This file is a GNU debug extension to the Standard C++ Library.
*/
#ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC
#define _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 1
namespace __gnu_debug
{
template<typename _Iterator, typename _Sequence>
bool
_Safe_iterator<_Iterator, _Sequence>::
_M_can_advance(const difference_type& __n) const
{
if (this->_M_singular())
return false;
if (__n == 0)
return true;
if (__n < 0)
{
std::pair<difference_type, _Distance_precision> __dist =
__get_distance_from_begin(*this);
bool __ok = ((__dist.second == __dp_exact && __dist.first >= -__n)
|| (__dist.second != __dp_exact && __dist.first > 0));
return __ok;
}
else
{
std::pair<difference_type, _Distance_precision> __dist =
__get_distance_to_end(*this);
bool __ok = ((__dist.second == __dp_exact && __dist.first >= __n)
|| (__dist.second != __dp_exact && __dist.first > 0));
return __ok;
}
}
template<typename _Iterator, typename _Sequence>
bool
_Safe_iterator<_Iterator, _Sequence>::
_M_valid_range(const _Safe_iterator& __rhs,
std::pair<difference_type, _Distance_precision>& __dist,
bool __check_dereferenceable) const
{
if (!_M_can_compare(__rhs))
return false;
/* Determine iterators order */
__dist = __get_distance(*this, __rhs);
switch (__dist.second)
{
case __dp_equality:
if (__dist.first == 0)
return true;
break;
case __dp_sign:
case __dp_exact:
// If range is not empty first iterator must be dereferenceable.
if (__dist.first > 0)
return !__check_dereferenceable || _M_dereferenceable();
return __dist.first == 0;
}
// Assume that this is a valid range; we can't check anything else.
return true;
}
} // namespace __gnu_debug
#endif
__gnu_debug
GNU debug classes for public use.
__gnu_debug::__check_dereferenceable
bool __check_dereferenceable(const _Iterator &)
Definition: functions.h:75
__gnu_debug::__get_distance
_Distance_traits< _Iterator >::__type __get_distance(const _Iterator &__lhs, const _Iterator &__rhs, std::random_access_iterator_tag)
Definition: helper_functions.h:83
std::pair::first
_T1 first
second_type is the second bound type
Definition: stl_pair.h:199
std::pair
Struct holding two objects of arbitrary type.
Definition: stl_pair.h:194
std::pair::second
_T2 second
first is a copy of the first object
Definition: stl_pair.h:200