1 | // Allocator traits -*- C++ -*- |
2 | |
3 | // Copyright (C) 2011-2024 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 ext/alloc_traits.h |
26 | * This file is a GNU extension to the Standard C++ Library. |
27 | */ |
28 | |
29 | #ifndef _EXT_ALLOC_TRAITS_H |
30 | #define _EXT_ALLOC_TRAITS_H 1 |
31 | |
32 | #pragma GCC system_header |
33 | |
34 | # include <bits/alloc_traits.h> |
35 | |
36 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
37 | { |
38 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
39 | |
40 | /** |
41 | * @brief Uniform interface to C++98 and C++11 allocators. |
42 | * @ingroup allocators |
43 | */ |
44 | template<typename _Alloc, typename = typename _Alloc::value_type> |
45 | struct __alloc_traits |
46 | #if __cplusplus >= 201103L |
47 | : std::allocator_traits<_Alloc> |
48 | #endif |
49 | { |
50 | typedef _Alloc allocator_type; |
51 | #if __cplusplus >= 201103L |
52 | typedef std::allocator_traits<_Alloc> _Base_type; |
53 | typedef typename _Base_type::value_type value_type; |
54 | typedef typename _Base_type::pointer pointer; |
55 | typedef typename _Base_type::const_pointer const_pointer; |
56 | typedef typename _Base_type::size_type size_type; |
57 | typedef typename _Base_type::difference_type difference_type; |
58 | // C++11 allocators do not define reference or const_reference |
59 | typedef value_type& reference; |
60 | typedef const value_type& const_reference; |
61 | using _Base_type::allocate; |
62 | using _Base_type::deallocate; |
63 | using _Base_type::construct; |
64 | using _Base_type::destroy; |
65 | using _Base_type::max_size; |
66 | |
67 | private: |
68 | template<typename _Ptr> |
69 | using __is_custom_pointer |
70 | = std::__and_<std::is_same<pointer, _Ptr>, |
71 | std::__not_<std::is_pointer<_Ptr>>>; |
72 | |
73 | public: |
74 | // overload construct for non-standard pointer types |
75 | template<typename _Ptr, typename... _Args> |
76 | [[__gnu__::__always_inline__]] |
77 | static _GLIBCXX14_CONSTEXPR |
78 | std::__enable_if_t<__is_custom_pointer<_Ptr>::value> |
79 | construct(_Alloc& __a, _Ptr __p, _Args&&... __args) |
80 | noexcept(noexcept(_Base_type::construct(__a, std::__to_address(__p), |
81 | std::forward<_Args>(__args)...))) |
82 | { |
83 | _Base_type::construct(__a, std::__to_address(__p), |
84 | std::forward<_Args>(__args)...); |
85 | } |
86 | |
87 | // overload destroy for non-standard pointer types |
88 | template<typename _Ptr> |
89 | [[__gnu__::__always_inline__]] |
90 | static _GLIBCXX14_CONSTEXPR |
91 | std::__enable_if_t<__is_custom_pointer<_Ptr>::value> |
92 | destroy(_Alloc& __a, _Ptr __p) |
93 | noexcept(noexcept(_Base_type::destroy(__a, std::__to_address(__p)))) |
94 | { _Base_type::destroy(__a, std::__to_address(__p)); } |
95 | |
96 | [[__gnu__::__always_inline__]] |
97 | static constexpr _Alloc _S_select_on_copy(const _Alloc& __a) |
98 | { return _Base_type::select_on_container_copy_construction(__a); } |
99 | |
100 | [[__gnu__::__always_inline__]] |
101 | static _GLIBCXX14_CONSTEXPR void _S_on_swap(_Alloc& __a, _Alloc& __b) |
102 | { std::__alloc_on_swap(__a, __b); } |
103 | |
104 | [[__gnu__::__always_inline__]] |
105 | static constexpr bool _S_propagate_on_copy_assign() |
106 | { return _Base_type::propagate_on_container_copy_assignment::value; } |
107 | |
108 | [[__gnu__::__always_inline__]] |
109 | static constexpr bool _S_propagate_on_move_assign() |
110 | { return _Base_type::propagate_on_container_move_assignment::value; } |
111 | |
112 | [[__gnu__::__always_inline__]] |
113 | static constexpr bool _S_propagate_on_swap() |
114 | { return _Base_type::propagate_on_container_swap::value; } |
115 | |
116 | [[__gnu__::__always_inline__]] |
117 | static constexpr bool _S_always_equal() |
118 | { return _Base_type::is_always_equal::value; } |
119 | |
120 | __attribute__((__always_inline__)) |
121 | static constexpr bool _S_nothrow_move() |
122 | { return _S_propagate_on_move_assign() || _S_always_equal(); } |
123 | |
124 | template<typename _Tp> |
125 | struct rebind |
126 | { typedef typename _Base_type::template rebind_alloc<_Tp> other; }; |
127 | #else // ! C++11 |
128 | |
129 | typedef typename _Alloc::pointer pointer; |
130 | typedef typename _Alloc::const_pointer const_pointer; |
131 | typedef typename _Alloc::value_type value_type; |
132 | typedef typename _Alloc::reference reference; |
133 | typedef typename _Alloc::const_reference const_reference; |
134 | typedef typename _Alloc::size_type size_type; |
135 | typedef typename _Alloc::difference_type difference_type; |
136 | |
137 | __attribute__((__always_inline__)) _GLIBCXX_NODISCARD |
138 | static pointer |
139 | allocate(_Alloc& __a, size_type __n) |
140 | { return __a.allocate(__n); } |
141 | |
142 | template<typename _Hint> |
143 | __attribute__((__always_inline__)) _GLIBCXX_NODISCARD |
144 | static pointer |
145 | allocate(_Alloc& __a, size_type __n, _Hint __hint) |
146 | { return __a.allocate(__n, __hint); } |
147 | |
148 | __attribute__((__always_inline__)) |
149 | static void deallocate(_Alloc& __a, pointer __p, size_type __n) |
150 | { __a.deallocate(__p, __n); } |
151 | |
152 | template<typename _Tp> |
153 | __attribute__((__always_inline__)) |
154 | static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) |
155 | { __a.construct(__p, __arg); } |
156 | |
157 | __attribute__((__always_inline__)) |
158 | static void destroy(_Alloc& __a, pointer __p) |
159 | { __a.destroy(__p); } |
160 | |
161 | __attribute__((__always_inline__)) |
162 | static size_type max_size(const _Alloc& __a) |
163 | { return __a.max_size(); } |
164 | |
165 | __attribute__((__always_inline__)) |
166 | static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } |
167 | |
168 | __attribute__((__always_inline__)) |
169 | static void _S_on_swap(_Alloc& __a, _Alloc& __b) |
170 | { |
171 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
172 | // 431. Swapping containers with unequal allocators. |
173 | std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); |
174 | } |
175 | |
176 | template<typename _Tp> |
177 | struct rebind |
178 | { typedef typename _Alloc::template rebind<_Tp>::other other; }; |
179 | #endif // C++11 |
180 | }; |
181 | |
182 | _GLIBCXX_END_NAMESPACE_VERSION |
183 | } // namespace __gnu_cxx |
184 | |
185 | #endif |
186 | |