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1 : // Allocator traits -*- C++ -*-
2 :
3 : // Copyright (C) 2011-2014 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 : std::false_type { };
48 :
49 : template<typename _Tp>
50 : struct __allocator_always_compares_equal<std::allocator<_Tp>>
51 : : std::true_type { };
52 :
53 : template<typename, typename> struct array_allocator;
54 :
55 : template<typename _Tp, typename _Array>
56 : struct __allocator_always_compares_equal<array_allocator<_Tp, _Array>>
57 : : std::true_type { };
58 :
59 : template<typename> struct bitmap_allocator;
60 :
61 : template<typename _Tp>
62 : struct __allocator_always_compares_equal<bitmap_allocator<_Tp>>
63 : : std::true_type { };
64 :
65 : template<typename> struct malloc_allocator;
66 :
67 : template<typename _Tp>
68 : struct __allocator_always_compares_equal<malloc_allocator<_Tp>>
69 : : std::true_type { };
70 :
71 : template<typename> struct mt_allocator;
72 :
73 : template<typename _Tp>
74 : struct __allocator_always_compares_equal<mt_allocator<_Tp>>
75 : : std::true_type { };
76 :
77 : template<typename> struct new_allocator;
78 :
79 : template<typename _Tp>
80 : struct __allocator_always_compares_equal<new_allocator<_Tp>>
81 : : std::true_type { };
82 :
83 : template<typename> struct pool_allocator;
84 :
85 : template<typename _Tp>
86 : struct __allocator_always_compares_equal<pool_allocator<_Tp>>
87 : : std::true_type { };
88 : #endif
89 :
90 : /**
91 : * @brief Uniform interface to C++98 and C++0x allocators.
92 : * @ingroup allocators
93 : */
94 : template<typename _Alloc>
95 : struct __alloc_traits
96 : #if __cplusplus >= 201103L
97 : : std::allocator_traits<_Alloc>
98 : #endif
99 : {
100 : typedef _Alloc allocator_type;
101 : #if __cplusplus >= 201103L
102 : typedef std::allocator_traits<_Alloc> _Base_type;
103 : typedef typename _Base_type::value_type value_type;
104 : typedef typename _Base_type::pointer pointer;
105 : typedef typename _Base_type::const_pointer const_pointer;
106 : typedef typename _Base_type::size_type size_type;
107 : typedef typename _Base_type::difference_type difference_type;
108 : // C++11 allocators do not define reference or const_reference
109 : typedef value_type& reference;
110 : typedef const value_type& const_reference;
111 : using _Base_type::allocate;
112 : using _Base_type::deallocate;
113 : using _Base_type::construct;
114 : using _Base_type::destroy;
115 : using _Base_type::max_size;
116 :
117 : private:
118 : template<typename _Ptr>
119 : using __is_custom_pointer
120 : = std::__and_<std::is_same<pointer, _Ptr>,
121 : std::__not_<std::is_pointer<_Ptr>>>;
122 :
123 : public:
124 : // overload construct for non-standard pointer types
125 : template<typename _Ptr, typename... _Args>
126 : static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
127 : construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
128 : {
129 : _Base_type::construct(__a, std::addressof(*__p),
130 : std::forward<_Args>(__args)...);
131 : }
132 :
133 : // overload destroy for non-standard pointer types
134 : template<typename _Ptr>
135 : static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
136 : destroy(_Alloc& __a, _Ptr __p)
137 : { _Base_type::destroy(__a, std::addressof(*__p)); }
138 :
139 48 : static _Alloc _S_select_on_copy(const _Alloc& __a)
140 48 : { return _Base_type::select_on_container_copy_construction(__a); }
141 :
142 0 : static void _S_on_swap(_Alloc& __a, _Alloc& __b)
143 0 : { std::__alloc_on_swap(__a, __b); }
144 :
145 12 : static constexpr bool _S_propagate_on_copy_assign()
146 12 : { return _Base_type::propagate_on_container_copy_assignment::value; }
147 :
148 : static constexpr bool _S_propagate_on_move_assign()
149 : { return _Base_type::propagate_on_container_move_assignment::value; }
150 :
151 : static constexpr bool _S_propagate_on_swap()
152 : { return _Base_type::propagate_on_container_swap::value; }
153 :
154 0 : static constexpr bool _S_always_equal()
155 0 : { return __allocator_always_compares_equal<_Alloc>::value; }
156 :
157 : static constexpr bool _S_nothrow_move()
158 : { return _S_propagate_on_move_assign() || _S_always_equal(); }
159 :
160 : static constexpr bool _S_nothrow_swap()
161 : {
162 : using std::swap;
163 : return !_S_propagate_on_swap()
164 : || noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>()));
165 : }
166 :
167 : template<typename _Tp>
168 : struct rebind
169 : { typedef typename _Base_type::template rebind_alloc<_Tp> other; };
170 : #else
171 :
172 : typedef typename _Alloc::pointer pointer;
173 : typedef typename _Alloc::const_pointer const_pointer;
174 : typedef typename _Alloc::value_type value_type;
175 : typedef typename _Alloc::reference reference;
176 : typedef typename _Alloc::const_reference const_reference;
177 : typedef typename _Alloc::size_type size_type;
178 : typedef typename _Alloc::difference_type difference_type;
179 :
180 : static pointer
181 : allocate(_Alloc& __a, size_type __n)
182 : { return __a.allocate(__n); }
183 :
184 : static void deallocate(_Alloc& __a, pointer __p, size_type __n)
185 : { __a.deallocate(__p, __n); }
186 :
187 : template<typename _Tp>
188 : static void construct(_Alloc& __a, pointer __p, const _Tp& __arg)
189 : { __a.construct(__p, __arg); }
190 :
191 : static void destroy(_Alloc& __a, pointer __p)
192 : { __a.destroy(__p); }
193 :
194 : static size_type max_size(const _Alloc& __a)
195 : { return __a.max_size(); }
196 :
197 : static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; }
198 :
199 : static void _S_on_swap(_Alloc& __a, _Alloc& __b)
200 : {
201 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
202 : // 431. Swapping containers with unequal allocators.
203 : std::__alloc_swap<_Alloc>::_S_do_it(__a, __b);
204 : }
205 :
206 : template<typename _Tp>
207 : struct rebind
208 : { typedef typename _Alloc::template rebind<_Tp>::other other; };
209 : #endif
210 : };
211 :
212 : _GLIBCXX_END_NAMESPACE_VERSION
213 : } // namespace std
214 :
215 : #endif
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