1 // Debugging iterator implementation (out of line) -*- C++ -*- 2 3 // Copyright (C) 2011-2020 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file debug/safe_local_iterator.tcc 26 * This file is a GNU debug extension to the Standard C++ Library. 27 */ 28 29 #ifndef _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_TCC 30 #define _GLIBCXX_DEBUG_SAFE_LOCAL_ITERATOR_TCC 1 31 32 namespace __gnu_debug 33 { 34 template<typename _Iterator, typename _Sequence> 35 typename _Distance_traits<_Iterator>::__type 36 _Safe_local_iterator<_Iterator, _Sequence>:: _M_get_distance_to(const _Safe_local_iterator & __rhs) const37 _M_get_distance_to(const _Safe_local_iterator& __rhs) const 38 { 39 if (base() == __rhs.base()) 40 return { 0, __dp_exact }; 41 42 if (_M_is_begin()) 43 { 44 if (__rhs._M_is_end()) 45 return 46 { 47 _M_get_sequence()->bucket_size(bucket()), 48 __dp_exact 49 }; 50 51 return { 1, __dp_sign }; 52 } 53 54 if (_M_is_end()) 55 { 56 if (__rhs._M_is_begin()) 57 return 58 { 59 -_M_get_sequence()->bucket_size(bucket()), 60 __dp_exact 61 }; 62 63 return { -1, __dp_sign }; 64 } 65 66 if (__rhs._M_is_begin()) 67 return { -1, __dp_sign }; 68 69 if (__rhs._M_is_end()) 70 return { 1, __dp_sign }; 71 72 return { 1, __dp_equality }; 73 } 74 75 template<typename _Iterator, typename _Sequence> 76 bool 77 _Safe_local_iterator<_Iterator, _Sequence>:: _M_valid_range(const _Safe_local_iterator & __rhs,std::pair<difference_type,_Distance_precision> & __dist) const78 _M_valid_range(const _Safe_local_iterator& __rhs, 79 std::pair<difference_type, _Distance_precision>& __dist) const 80 { 81 if (!_M_can_compare(__rhs)) 82 return false; 83 84 if (bucket() != __rhs.bucket()) 85 return false; 86 87 /* Determine if we can order the iterators without the help of 88 the container */ 89 __dist = _M_get_distance_to(__rhs); 90 switch (__dist.second) 91 { 92 case __dp_equality: 93 if (__dist.first == 0) 94 return true; 95 break; 96 97 case __dp_sign: 98 case __dp_exact: 99 return __dist.first >= 0; 100 } 101 102 // Assume that this is a valid range; we can't check anything else 103 return true; 104 } 105 } // namespace __gnu_debug 106 107 #endif 108