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15ee1a77 FD |
1 | // Safe container implementation -*- C++ -*- |
2 | ||
99dee823 | 3 | // Copyright (C) 2014-2021 Free Software Foundation, Inc. |
15ee1a77 FD |
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, | |
3838e0c0 FD |
39 | template<typename> class _SafeBase, |
40 | bool _IsCxx11AllocatorAware = true> | |
15ee1a77 FD |
41 | class _Safe_container |
42 | : public _SafeBase<_SafeContainer> | |
43 | { | |
44 | typedef _SafeBase<_SafeContainer> _Base; | |
45 | ||
46 | _SafeContainer& | |
47 | _M_cont() _GLIBCXX_NOEXCEPT | |
48 | { return *static_cast<_SafeContainer*>(this); } | |
49 | ||
50 | protected: | |
51 | _Safe_container& | |
52 | _M_safe() _GLIBCXX_NOEXCEPT | |
53 | { return *this; } | |
54 | ||
55 | #if __cplusplus >= 201103L | |
56 | _Safe_container() = default; | |
57 | _Safe_container(const _Safe_container&) = default; | |
5d045324 | 58 | _Safe_container(_Safe_container&&) = default; |
15ee1a77 | 59 | |
5d045324 | 60 | _Safe_container(_Safe_container&& __x, const _Alloc& __a) |
15ee1a77 FD |
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 | { | |
c2fb0a1a JW |
83 | if (std::__addressof(__x) == this) |
84 | { | |
85 | // Standard containers have a valid but unspecified value after | |
86 | // self-move, so we invalidate all debug iterators even if the | |
87 | // underlying container happens to preserve its contents. | |
88 | this->_M_invalidate_all(); | |
89 | return *this; | |
90 | } | |
15ee1a77 FD |
91 | |
92 | if (_IsCxx11AllocatorAware) | |
93 | { | |
94 | typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits; | |
95 | ||
96 | bool __xfer_memory = _Alloc_traits::_S_propagate_on_move_assign() | |
97 | || _M_cont().get_allocator() == __x._M_cont().get_allocator(); | |
98 | if (__xfer_memory) | |
99 | _Base::_M_swap(__x); | |
100 | else | |
101 | this->_M_invalidate_all(); | |
102 | } | |
103 | else | |
104 | _Base::_M_swap(__x); | |
105 | ||
106 | __x._M_invalidate_all(); | |
107 | return *this; | |
108 | } | |
109 | ||
110 | void | |
111 | _M_swap(_Safe_container& __x) noexcept | |
112 | { | |
113 | if (_IsCxx11AllocatorAware) | |
114 | { | |
115 | typedef __gnu_cxx::__alloc_traits<_Alloc> _Alloc_traits; | |
116 | ||
117 | if (!_Alloc_traits::_S_propagate_on_swap()) | |
118 | __glibcxx_check_equal_allocs(this->_M_cont()._M_base(), | |
119 | __x._M_cont()._M_base()); | |
120 | } | |
121 | ||
122 | _Base::_M_swap(__x); | |
123 | } | |
124 | #endif | |
125 | }; | |
126 | ||
127 | } // namespace __gnu_debug | |
128 | ||
129 | #endif |