1 // Debugging iterator implementation (out of line) -*- C++ -*- 2 3 // Copyright (C) 2003, 2004 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 2, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // You should have received a copy of the GNU General Public License along 18 // with this library; see the file COPYING. If not, write to the Free 19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 20 // USA. 21 22 // As a special exception, you may use this file as part of a free software 23 // library without restriction. Specifically, if other files instantiate 24 // templates or use macros or inline functions from this file, or you compile 25 // this file and link it with other files to produce an executable, this 26 // file does not by itself cause the resulting executable to be covered by 27 // the GNU General Public License. This exception does not however 28 // invalidate any other reasons why the executable file might be covered by 29 // the GNU General Public License. 30 31 /** @file safe_iterator.tcc 32 * This is an internal header file, included by other library headers. 33 * You should not attempt to use it directly. 34 */ 35 36 #ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 37 #define _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 1 38 39 namespace __gnu_debug 40 { 41 template<typename _Iterator, typename _Sequence> 42 bool 43 _Safe_iterator<_Iterator, _Sequence>:: 44 _M_can_advance(const difference_type& __n) const 45 { 46 typedef typename _Sequence::const_iterator const_iterator; 47 48 if (this->_M_singular()) 49 return false; 50 if (__n == 0) 51 return true; 52 if (__n < 0) 53 { 54 const_iterator __begin = 55 static_cast<const _Sequence*>(_M_sequence)->begin(); 56 pair<difference_type, _Distance_precision> __dist = 57 this->_M_get_distance(__begin, *this); 58 bool __ok = (__dist.second == __dp_exact && __dist.first >= -__n 59 || __dist.second != __dp_exact && __dist.first > 0); 60 return __ok; 61 } 62 else 63 { 64 const_iterator __end = 65 static_cast<const _Sequence*>(_M_sequence)->end(); 66 pair<difference_type, _Distance_precision> __dist = 67 this->_M_get_distance(*this, __end); 68 bool __ok = (__dist.second == __dp_exact && __dist.first >= __n 69 || __dist.second != __dp_exact && __dist.first > 0); 70 return __ok; 71 } 72 } 73 74 template<typename _Iterator, typename _Sequence> 75 template<typename _Other> 76 bool 77 _Safe_iterator<_Iterator, _Sequence>:: 78 _M_valid_range(const _Safe_iterator<_Other, _Sequence>& __rhs) const 79 { 80 if (!_M_can_compare(__rhs)) 81 return false; 82 83 /* Determine if we can order the iterators without the help of 84 the container */ 85 pair<difference_type, _Distance_precision> __dist = 86 this->_M_get_distance(*this, __rhs); 87 switch (__dist.second) { 88 case __dp_equality: 89 if (__dist.first == 0) 90 return true; 91 break; 92 93 case __dp_sign: 94 case __dp_exact: 95 return __dist.first >= 0; 96 } 97 98 /* We can only test for equality, but check if one of the 99 iterators is at an extreme. */ 100 if (_M_is_begin() || __rhs._M_is_end()) 101 return true; 102 else if (_M_is_end() || __rhs._M_is_begin()) 103 return false; 104 105 // Assume that this is a valid range; we can't check anything else 106 return true; 107 } 108 109 template<typename _Iterator, typename _Sequence> 110 void 111 _Safe_iterator<_Iterator, _Sequence>:: 112 _M_invalidate() 113 { 114 typedef typename _Sequence::iterator iterator; 115 typedef typename _Sequence::const_iterator const_iterator; 116 117 if (!this->_M_singular()) 118 { 119 for (_Safe_iterator_base* iter = _M_sequence->_M_iterators; iter; ) 120 { 121 iterator* __victim = static_cast<iterator*>(iter); 122 iter = iter->_M_next; 123 if (this->base() == __victim->base()) 124 __victim->_M_version = 0; 125 } 126 for (_Safe_iterator_base* iter2 = _M_sequence->_M_const_iterators; 127 iter2; /* increment in loop */) 128 { 129 const_iterator* __victim = static_cast<const_iterator*>(iter2); 130 iter2 = iter2->_M_next; 131 if (this->base() == __victim->base()) 132 __victim->_M_version = 0; 133 } 134 _M_version = 0; 135 } 136 } 137 } // namespace __gnu_debug 138 139 #endif 140 141