1 // Safe container implementation -*- C++ -*- 2 3 // Copyright (C) 2014-2015 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; _Safe_container(_Safe_container && __x)58 _Safe_container(_Safe_container&& __x) noexcept 59 : _Safe_container() 60 { _Base::_M_swap(__x); } 61 _Safe_container(_Safe_container && __x,const _Alloc & __a)62 _Safe_container(_Safe_container&& __x, 63 const _Alloc& __a) 64 : _Safe_container() 65 { 66 if (__x._M_cont().get_allocator() == __a) 67 _Base::_M_swap(__x); 68 else 69 __x._M_invalidate_all(); 70 } 71 #endif 72 73 public: 74 // Copy assignment invalidate all iterators. 75 _Safe_container& 76 operator=(const _Safe_container&) _GLIBCXX_NOEXCEPT 77 { 78 this->_M_invalidate_all(); 79 return *this; 80 } 81 82 #if __cplusplus >= 201103L 83 _Safe_container& 84 operator=(_Safe_container&& __x) noexcept 85 { 86 __glibcxx_check_self_move_assign(__x); 87 88 if (_IsCxx11AllocatorAware) 89 { 90 typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits; 91 92 bool __xfer_memory = _Alloc_traits::_S_propagate_on_move_assign() 93 || _M_cont().get_allocator() == __x._M_cont().get_allocator(); 94 if (__xfer_memory) 95 _Base::_M_swap(__x); 96 else 97 this->_M_invalidate_all(); 98 } 99 else 100 _Base::_M_swap(__x); 101 102 __x._M_invalidate_all(); 103 return *this; 104 } 105 106 void _M_swap(_Safe_container & __x)107 _M_swap(_Safe_container& __x) noexcept 108 { 109 if (_IsCxx11AllocatorAware) 110 { 111 typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits; 112 113 if (!_Alloc_traits::_S_propagate_on_swap()) 114 __glibcxx_check_equal_allocs(this->_M_cont()._M_base(), 115 __x._M_cont()._M_base()); 116 } 117 118 _Base::_M_swap(__x); 119 } 120 #endif 121 }; 122 123 } // namespace __gnu_debug 124 125 #endif 126