1*38fd1498Szrj // Debugging iterator implementation (out of line) -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj // Copyright (C) 2003-2018 Free Software Foundation, Inc. 4*38fd1498Szrj // 5*38fd1498Szrj // This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj // software; you can redistribute it and/or modify it under the 7*38fd1498Szrj // terms of the GNU General Public License as published by the 8*38fd1498Szrj // Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj // any later version. 10*38fd1498Szrj 11*38fd1498Szrj // This library is distributed in the hope that it will be useful, 12*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj // GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj // 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj // You should have received a copy of the GNU General Public License and 21*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj // <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj /** @file debug/safe_iterator.tcc 26*38fd1498Szrj * This file is a GNU debug extension to the Standard C++ Library. 27*38fd1498Szrj */ 28*38fd1498Szrj 29*38fd1498Szrj #ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 30*38fd1498Szrj #define _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 1 31*38fd1498Szrj 32*38fd1498Szrj namespace __gnu_debug 33*38fd1498Szrj { 34*38fd1498Szrj template<typename _Iterator, typename _Sequence> 35*38fd1498Szrj bool 36*38fd1498Szrj _Safe_iterator<_Iterator, _Sequence>:: _M_can_advance(const difference_type & __n) const37*38fd1498Szrj _M_can_advance(const difference_type& __n) const 38*38fd1498Szrj { 39*38fd1498Szrj if (this->_M_singular()) 40*38fd1498Szrj return false; 41*38fd1498Szrj 42*38fd1498Szrj if (__n == 0) 43*38fd1498Szrj return true; 44*38fd1498Szrj 45*38fd1498Szrj if (__n < 0) 46*38fd1498Szrj { 47*38fd1498Szrj std::pair<difference_type, _Distance_precision> __dist = 48*38fd1498Szrj __get_distance_from_begin(*this); 49*38fd1498Szrj bool __ok = ((__dist.second == __dp_exact && __dist.first >= -__n) 50*38fd1498Szrj || (__dist.second != __dp_exact && __dist.first > 0)); 51*38fd1498Szrj return __ok; 52*38fd1498Szrj } 53*38fd1498Szrj else 54*38fd1498Szrj { 55*38fd1498Szrj std::pair<difference_type, _Distance_precision> __dist = 56*38fd1498Szrj __get_distance_to_end(*this); 57*38fd1498Szrj bool __ok = ((__dist.second == __dp_exact && __dist.first >= __n) 58*38fd1498Szrj || (__dist.second != __dp_exact && __dist.first > 0)); 59*38fd1498Szrj return __ok; 60*38fd1498Szrj } 61*38fd1498Szrj } 62*38fd1498Szrj 63*38fd1498Szrj template<typename _Iterator, typename _Sequence> 64*38fd1498Szrj bool 65*38fd1498Szrj _Safe_iterator<_Iterator, _Sequence>:: _M_valid_range(const _Safe_iterator & __rhs,std::pair<difference_type,_Distance_precision> & __dist,bool __check_dereferenceable) const66*38fd1498Szrj _M_valid_range(const _Safe_iterator& __rhs, 67*38fd1498Szrj std::pair<difference_type, _Distance_precision>& __dist, 68*38fd1498Szrj bool __check_dereferenceable) const 69*38fd1498Szrj { 70*38fd1498Szrj if (!_M_can_compare(__rhs)) 71*38fd1498Szrj return false; 72*38fd1498Szrj 73*38fd1498Szrj /* Determine iterators order */ 74*38fd1498Szrj __dist = __get_distance(*this, __rhs); 75*38fd1498Szrj switch (__dist.second) 76*38fd1498Szrj { 77*38fd1498Szrj case __dp_equality: 78*38fd1498Szrj if (__dist.first == 0) 79*38fd1498Szrj return true; 80*38fd1498Szrj break; 81*38fd1498Szrj 82*38fd1498Szrj case __dp_sign: 83*38fd1498Szrj case __dp_exact: 84*38fd1498Szrj // If range is not empty first iterator must be dereferenceable. 85*38fd1498Szrj if (__dist.first > 0) 86*38fd1498Szrj return !__check_dereferenceable || _M_dereferenceable(); 87*38fd1498Szrj return __dist.first == 0; 88*38fd1498Szrj } 89*38fd1498Szrj 90*38fd1498Szrj // Assume that this is a valid range; we can't check anything else. 91*38fd1498Szrj return true; 92*38fd1498Szrj } 93*38fd1498Szrj } // namespace __gnu_debug 94*38fd1498Szrj 95*38fd1498Szrj #endif 96