96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
// Debugging iterator implementation (out of line) -*- C++ -*-
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// Copyright (C) 2003-2018 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file debug/safe_iterator.tcc
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* This file is a GNU debug extension to the Standard C++ Library.
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*/
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#ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC
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#define _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 1
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namespace __gnu_debug
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{
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template<typename _Iterator, typename _Sequence>
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bool
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_Safe_iterator<_Iterator, _Sequence>::
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_M_can_advance(const difference_type& __n) const
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{
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if (this->_M_singular())
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return false;
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if (__n == 0)
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return true;
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if (__n < 0)
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{
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std::pair<difference_type, _Distance_precision> __dist =
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__get_distance_from_begin(*this);
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bool __ok = ((__dist.second == __dp_exact && __dist.first >= -__n)
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|| (__dist.second != __dp_exact && __dist.first > 0));
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return __ok;
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}
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else
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{
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std::pair<difference_type, _Distance_precision> __dist =
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__get_distance_to_end(*this);
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bool __ok = ((__dist.second == __dp_exact && __dist.first >= __n)
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|| (__dist.second != __dp_exact && __dist.first > 0));
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return __ok;
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}
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}
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template<typename _Iterator, typename _Sequence>
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bool
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_Safe_iterator<_Iterator, _Sequence>::
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_M_valid_range(const _Safe_iterator& __rhs,
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std::pair<difference_type, _Distance_precision>& __dist,
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bool __check_dereferenceable) const
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{
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if (!_M_can_compare(__rhs))
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return false;
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/* Determine iterators order */
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__dist = __get_distance(*this, __rhs);
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switch (__dist.second)
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{
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case __dp_equality:
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if (__dist.first == 0)
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return true;
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break;
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case __dp_sign:
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case __dp_exact:
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// If range is not empty first iterator must be dereferenceable.
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if (__dist.first > 0)
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return !__check_dereferenceable || _M_dereferenceable();
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return __dist.first == 0;
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}
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// Assume that this is a valid range; we can't check anything else.
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return true;
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}
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} // namespace __gnu_debug
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#endif
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