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1 : // Allocator traits -*- C++ -*-
2 :
3 : // Copyright (C) 2011-2013 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 : #if __cplusplus >= 201103L
35 : # include <bits/move.h>
36 : # include <bits/alloc_traits.h>
37 : #else
38 : # include <bits/allocator.h> // for __alloc_swap
39 : #endif
40 :
41 : namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
42 : {
43 : _GLIBCXX_BEGIN_NAMESPACE_VERSION
44 :
45 : #if __cplusplus >= 201103L
46 : template<typename _Alloc>
47 : struct __allocator_always_compares_equal
48 : { static const bool value = false; };
49 :
50 : template<typename _Alloc>
51 : const bool __allocator_always_compares_equal<_Alloc>::value;
52 :
53 : template<typename _Tp>
54 : struct __allocator_always_compares_equal<std::allocator<_Tp>>
55 : { static const bool value = true; };
56 :
57 : template<typename _Tp>
58 : const bool __allocator_always_compares_equal<std::allocator<_Tp>>::value;
59 :
60 : template<typename, typename> struct array_allocator;
61 :
62 : template<typename _Tp, typename _Array>
63 : struct __allocator_always_compares_equal<array_allocator<_Tp, _Array>>
64 : { static const bool value = true; };
65 :
66 : template<typename _Tp, typename _Array>
67 : const bool
68 : __allocator_always_compares_equal<array_allocator<_Tp, _Array>>::value;
69 :
70 : template<typename> struct bitmap_allocator;
71 :
72 : template<typename _Tp>
73 : struct __allocator_always_compares_equal<bitmap_allocator<_Tp>>
74 : { static const bool value = true; };
75 :
76 : template<typename _Tp>
77 : const bool __allocator_always_compares_equal<bitmap_allocator<_Tp>>::value;
78 :
79 : template<typename> struct malloc_allocator;
80 :
81 : template<typename _Tp>
82 : struct __allocator_always_compares_equal<malloc_allocator<_Tp>>
83 : { static const bool value = true; };
84 :
85 : template<typename _Tp>
86 : const bool __allocator_always_compares_equal<malloc_allocator<_Tp>>::value;
87 :
88 : template<typename> struct mt_allocator;
89 :
90 : template<typename _Tp>
91 : struct __allocator_always_compares_equal<mt_allocator<_Tp>>
92 : { static const bool value = true; };
93 :
94 : template<typename _Tp>
95 : const bool __allocator_always_compares_equal<mt_allocator<_Tp>>::value;
96 :
97 : template<typename> struct new_allocator;
98 :
99 : template<typename _Tp>
100 : struct __allocator_always_compares_equal<new_allocator<_Tp>>
101 : { static const bool value = true; };
102 :
103 : template<typename _Tp>
104 : const bool __allocator_always_compares_equal<new_allocator<_Tp>>::value;
105 :
106 : template<typename> struct pool_allocator;
107 :
108 : template<typename _Tp>
109 : struct __allocator_always_compares_equal<pool_allocator<_Tp>>
110 : { static const bool value = true; };
111 :
112 : template<typename _Tp>
113 : const bool __allocator_always_compares_equal<pool_allocator<_Tp>>::value;
114 : #endif
115 :
116 : /**
117 : * @brief Uniform interface to C++98 and C++0x allocators.
118 : * @ingroup allocators
119 : */
120 : template<typename _Alloc>
121 : struct __alloc_traits
122 : #if __cplusplus >= 201103L
123 : : std::allocator_traits<_Alloc>
124 : #endif
125 : {
126 : typedef _Alloc allocator_type;
127 : #if __cplusplus >= 201103L
128 : typedef std::allocator_traits<_Alloc> _Base_type;
129 : typedef typename _Base_type::value_type value_type;
130 : typedef typename _Base_type::pointer pointer;
131 : typedef typename _Base_type::const_pointer const_pointer;
132 : typedef typename _Base_type::size_type size_type;
133 : typedef typename _Base_type::difference_type difference_type;
134 : // C++0x allocators do not define reference or const_reference
135 : typedef value_type& reference;
136 : typedef const value_type& const_reference;
137 : using _Base_type::allocate;
138 : using _Base_type::deallocate;
139 : using _Base_type::construct;
140 : using _Base_type::destroy;
141 : using _Base_type::max_size;
142 :
143 : private:
144 : template<typename _Ptr>
145 : struct __is_custom_pointer
146 : : std::integral_constant<bool, std::is_same<pointer, _Ptr>::value
147 : && !std::is_pointer<_Ptr>::value>
148 : { };
149 :
150 : public:
151 : // overload construct for non-standard pointer types
152 : template<typename _Ptr, typename... _Args>
153 : static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
154 : construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
155 : {
156 : _Base_type::construct(__a, std::addressof(*__p),
157 : std::forward<_Args>(__args)...);
158 : }
159 :
160 : // overload destroy for non-standard pointer types
161 : template<typename _Ptr>
162 : static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
163 : destroy(_Alloc& __a, _Ptr __p)
164 : { _Base_type::destroy(__a, std::addressof(*__p)); }
165 :
166 : static _Alloc _S_select_on_copy(const _Alloc& __a)
167 12 : { return _Base_type::select_on_container_copy_construction(__a); }
168 :
169 : static void _S_on_swap(_Alloc& __a, _Alloc& __b)
170 : { std::__alloc_on_swap(__a, __b); }
171 :
172 : static constexpr bool _S_propagate_on_copy_assign()
173 : { return _Base_type::propagate_on_container_copy_assignment::value; }
174 :
175 : static constexpr bool _S_propagate_on_move_assign()
176 : { return _Base_type::propagate_on_container_move_assignment::value; }
177 :
178 : static constexpr bool _S_propagate_on_swap()
179 : { return _Base_type::propagate_on_container_swap::value; }
180 :
181 : static constexpr bool _S_always_equal()
182 : { return __allocator_always_compares_equal<_Alloc>::value; }
183 :
184 : static constexpr bool _S_nothrow_move()
185 : { return _S_propagate_on_move_assign() || _S_always_equal(); }
186 :
187 : static constexpr bool _S_nothrow_swap()
188 : {
189 : using std::swap;
190 : return !_S_propagate_on_swap()
191 : || noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>()));
192 : }
193 :
194 : template<typename _Tp>
195 : struct rebind
196 : { typedef typename _Base_type::template rebind_alloc<_Tp> other; };
197 : #else
198 :
199 : typedef typename _Alloc::pointer pointer;
200 : typedef typename _Alloc::const_pointer const_pointer;
201 : typedef typename _Alloc::value_type value_type;
202 : typedef typename _Alloc::reference reference;
203 : typedef typename _Alloc::const_reference const_reference;
204 : typedef typename _Alloc::size_type size_type;
205 : typedef typename _Alloc::difference_type difference_type;
206 :
207 : static pointer
208 : allocate(_Alloc& __a, size_type __n)
209 : { return __a.allocate(__n); }
210 :
211 : static void deallocate(_Alloc& __a, pointer __p, size_type __n)
212 : { __a.deallocate(__p, __n); }
213 :
214 : template<typename _Tp>
215 : static void construct(_Alloc& __a, pointer __p, const _Tp& __arg)
216 : { __a.construct(__p, __arg); }
217 :
218 : static void destroy(_Alloc& __a, pointer __p)
219 : { __a.destroy(__p); }
220 :
221 : static size_type max_size(const _Alloc& __a)
222 : { return __a.max_size(); }
223 :
224 : static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; }
225 :
226 : static void _S_on_swap(_Alloc& __a, _Alloc& __b)
227 : {
228 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
229 : // 431. Swapping containers with unequal allocators.
230 : std::__alloc_swap<_Alloc>::_S_do_it(__a, __b);
231 : }
232 :
233 : template<typename _Tp>
234 : struct rebind
235 : { typedef typename _Alloc::template rebind<_Tp>::other other; };
236 : #endif
237 : };
238 :
239 : _GLIBCXX_END_NAMESPACE_VERSION
240 : } // namespace std
241 :
242 : #endif
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