1 // Safe container implementation -*- C++ -*- 2 3 // Copyright (C) 2014-2018 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_container.h 26 * This file is a GNU debug extension to the Standard C++ Library. 27 */ 28 29 #ifndef _GLIBCXX_DEBUG_SAFE_CONTAINER_H 30 #define _GLIBCXX_DEBUG_SAFE_CONTAINER_H 1 31 32 #include <ext/alloc_traits.h> 33 34 namespace __gnu_debug 35 { 36 /// Safe class dealing with some allocator dependent operations. 37 template<typename _SafeContainer, 38 typename _Alloc, 39 template<typename> class _SafeBase, 40 bool _IsCxx11AllocatorAware = true> 41 class _Safe_container 42 : public _SafeBase<_SafeContainer> 43 { 44 typedef _SafeBase<_SafeContainer> _Base; 45 46 _SafeContainer& _M_cont()47 _M_cont() _GLIBCXX_NOEXCEPT 48 { return *static_cast<_SafeContainer*>(this); } 49 50 protected: 51 _Safe_container& _M_safe()52 _M_safe() _GLIBCXX_NOEXCEPT 53 { return *this; } 54 55 #if __cplusplus >= 201103L 56 _Safe_container() = default; 57 _Safe_container(const _Safe_container&) = default; 58 _Safe_container(_Safe_container&&) = default; 59 _Safe_container(_Safe_container && __x,const _Alloc & __a)60 _Safe_container(_Safe_container&& __x, const _Alloc& __a) 61 : _Safe_container() 62 { 63 if (__x._M_cont().get_allocator() == __a) 64 _Base::_M_swap(__x); 65 else 66 __x._M_invalidate_all(); 67 } 68 #endif 69 70 public: 71 // Copy assignment invalidate all iterators. 72 _Safe_container& 73 operator=(const _Safe_container&) _GLIBCXX_NOEXCEPT 74 { 75 this->_M_invalidate_all(); 76 return *this; 77 } 78 79 #if __cplusplus >= 201103L 80 _Safe_container& 81 operator=(_Safe_container&& __x) noexcept 82 { 83 __glibcxx_check_self_move_assign(__x); 84 85 if (_IsCxx11AllocatorAware) 86 { 87 typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits; 88 89 bool __xfer_memory = _Alloc_traits::_S_propagate_on_move_assign() 90 || _M_cont().get_allocator() == __x._M_cont().get_allocator(); 91 if (__xfer_memory) 92 _Base::_M_swap(__x); 93 else 94 this->_M_invalidate_all(); 95 } 96 else 97 _Base::_M_swap(__x); 98 99 __x._M_invalidate_all(); 100 return *this; 101 } 102 103 void _M_swap(_Safe_container & __x)104 _M_swap(_Safe_container& __x) noexcept 105 { 106 if (_IsCxx11AllocatorAware) 107 { 108 typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits; 109 110 if (!_Alloc_traits::_S_propagate_on_swap()) 111 __glibcxx_check_equal_allocs(this->_M_cont()._M_base(), 112 __x._M_cont()._M_base()); 113 } 114 115 _Base::_M_swap(__x); 116 } 117 #endif 118 }; 119 120 } // namespace __gnu_debug 121 122 #endif 123