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1 : // Allocator traits -*- C++ -*-
2 :
3 : // Copyright (C) 2011-2016 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 : /**
46 : * @brief Uniform interface to C++98 and C++11 allocators.
47 : * @ingroup allocators
48 : */
49 : template<typename _Alloc>
50 : struct __alloc_traits
51 : #if __cplusplus >= 201103L
52 : : std::allocator_traits<_Alloc>
53 : #endif
54 : {
55 : typedef _Alloc allocator_type;
56 : #if __cplusplus >= 201103L
57 : typedef std::allocator_traits<_Alloc> _Base_type;
58 : typedef typename _Base_type::value_type value_type;
59 : typedef typename _Base_type::pointer pointer;
60 : typedef typename _Base_type::const_pointer const_pointer;
61 : typedef typename _Base_type::size_type size_type;
62 : typedef typename _Base_type::difference_type difference_type;
63 : // C++11 allocators do not define reference or const_reference
64 : typedef value_type& reference;
65 : typedef const value_type& const_reference;
66 : using _Base_type::allocate;
67 : using _Base_type::deallocate;
68 : using _Base_type::construct;
69 : using _Base_type::destroy;
70 : using _Base_type::max_size;
71 :
72 : private:
73 : template<typename _Ptr>
74 : using __is_custom_pointer
75 : = std::__and_<std::is_same<pointer, _Ptr>,
76 : std::__not_<std::is_pointer<_Ptr>>>;
77 :
78 : public:
79 : // overload construct for non-standard pointer types
80 : template<typename _Ptr, typename... _Args>
81 : static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
82 : construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
83 : {
84 : _Base_type::construct(__a, std::addressof(*__p),
85 : std::forward<_Args>(__args)...);
86 : }
87 :
88 : // overload destroy for non-standard pointer types
89 : template<typename _Ptr>
90 : static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
91 : destroy(_Alloc& __a, _Ptr __p)
92 : { _Base_type::destroy(__a, std::addressof(*__p)); }
93 :
94 197 : static _Alloc _S_select_on_copy(const _Alloc& __a)
95 197 : { return _Base_type::select_on_container_copy_construction(__a); }
96 :
97 0 : static void _S_on_swap(_Alloc& __a, _Alloc& __b)
98 0 : { std::__alloc_on_swap(__a, __b); }
99 :
100 13 : static constexpr bool _S_propagate_on_copy_assign()
101 13 : { return _Base_type::propagate_on_container_copy_assignment::value; }
102 :
103 : static constexpr bool _S_propagate_on_move_assign()
104 : { return _Base_type::propagate_on_container_move_assignment::value; }
105 :
106 : static constexpr bool _S_propagate_on_swap()
107 : { return _Base_type::propagate_on_container_swap::value; }
108 :
109 0 : static constexpr bool _S_always_equal()
110 0 : { return _Base_type::is_always_equal::value; }
111 :
112 : static constexpr bool _S_nothrow_move()
113 : { return _S_propagate_on_move_assign() || _S_always_equal(); }
114 :
115 : template<typename _Tp>
116 : struct rebind
117 : { typedef typename _Base_type::template rebind_alloc<_Tp> other; };
118 : #else
119 :
120 : typedef typename _Alloc::pointer pointer;
121 : typedef typename _Alloc::const_pointer const_pointer;
122 : typedef typename _Alloc::value_type value_type;
123 : typedef typename _Alloc::reference reference;
124 : typedef typename _Alloc::const_reference const_reference;
125 : typedef typename _Alloc::size_type size_type;
126 : typedef typename _Alloc::difference_type difference_type;
127 :
128 : static pointer
129 : allocate(_Alloc& __a, size_type __n)
130 : { return __a.allocate(__n); }
131 :
132 : static void deallocate(_Alloc& __a, pointer __p, size_type __n)
133 : { __a.deallocate(__p, __n); }
134 :
135 : template<typename _Tp>
136 : static void construct(_Alloc& __a, pointer __p, const _Tp& __arg)
137 : { __a.construct(__p, __arg); }
138 :
139 : static void destroy(_Alloc& __a, pointer __p)
140 : { __a.destroy(__p); }
141 :
142 : static size_type max_size(const _Alloc& __a)
143 : { return __a.max_size(); }
144 :
145 : static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; }
146 :
147 : static void _S_on_swap(_Alloc& __a, _Alloc& __b)
148 : {
149 : // _GLIBCXX_RESOLVE_LIB_DEFECTS
150 : // 431. Swapping containers with unequal allocators.
151 : std::__alloc_swap<_Alloc>::_S_do_it(__a, __b);
152 : }
153 :
154 : template<typename _Tp>
155 : struct rebind
156 : { typedef typename _Alloc::template rebind<_Tp>::other other; };
157 : #endif
158 : };
159 :
160 : _GLIBCXX_END_NAMESPACE_VERSION
161 : } // namespace __gnu_cxx
162 :
163 : #endif
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