1 | // Allocator that wraps operator new -*- C++ -*- |
2 | |
3 | // Copyright (C) 2001-2016 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/new_allocator.h |
26 | * This file is a GNU extension to the Standard C++ Library. |
27 | */ |
28 | |
29 | #ifndef _NEW_ALLOCATOR_H |
30 | #define _NEW_ALLOCATOR_H 1 |
31 | |
32 | #include <bits/c++config.h> |
33 | #include <new> |
34 | #include <bits/functexcept.h> |
35 | #include <bits/move.h> |
36 | #if __cplusplus >= 201103L |
37 | #include <type_traits> |
38 | #endif |
39 | |
40 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
41 | { |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
43 | |
44 | using std::size_t; |
45 | using std::ptrdiff_t; |
46 | |
47 | /** |
48 | * @brief An allocator that uses global new, as per [20.4]. |
49 | * @ingroup allocators |
50 | * |
51 | * This is precisely the allocator defined in the C++ Standard. |
52 | * - all allocation calls operator new |
53 | * - all deallocation calls operator delete |
54 | * |
55 | * @tparam _Tp Type of allocated object. |
56 | */ |
57 | template<typename _Tp> |
58 | class new_allocator |
59 | { |
60 | public: |
61 | typedef size_t size_type; |
62 | typedef ptrdiff_t difference_type; |
63 | typedef _Tp* pointer; |
64 | typedef const _Tp* const_pointer; |
65 | typedef _Tp& reference; |
66 | typedef const _Tp& const_reference; |
67 | typedef _Tp value_type; |
68 | |
69 | template<typename _Tp1> |
70 | struct rebind |
71 | { typedef new_allocator<_Tp1> other; }; |
72 | |
73 | #if __cplusplus >= 201103L |
74 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
75 | // 2103. propagate_on_container_move_assignment |
76 | typedef std::true_type propagate_on_container_move_assignment; |
77 | #endif |
78 | |
79 | new_allocator() _GLIBCXX_USE_NOEXCEPT { } |
80 | |
81 | new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { } |
82 | |
83 | template<typename _Tp1> |
84 | new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { } |
85 | |
86 | ~new_allocator() _GLIBCXX_USE_NOEXCEPT { } |
87 | |
88 | pointer |
89 | address(reference __x) const _GLIBCXX_NOEXCEPT |
90 | { return std::__addressof(__x); } |
91 | |
92 | const_pointer |
93 | address(const_reference __x) const _GLIBCXX_NOEXCEPT |
94 | { return std::__addressof(__x); } |
95 | |
96 | // NB: __n is permitted to be 0. The C++ standard says nothing |
97 | // about what the return value is when __n == 0. |
98 | pointer |
99 | allocate(size_type __n, const void* = 0) |
100 | { |
101 | if (__n > this->max_size()) |
102 | std::__throw_bad_alloc(); |
103 | |
104 | return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp))); |
105 | } |
106 | |
107 | // __p is not permitted to be a null pointer. |
108 | void |
109 | deallocate(pointer __p, size_type) |
110 | { ::operator delete(__p); } |
111 | |
112 | size_type |
113 | max_size() const _GLIBCXX_USE_NOEXCEPT |
114 | { return size_t(-1) / sizeof(_Tp); } |
115 | |
116 | #if __cplusplus >= 201103L |
117 | template<typename _Up, typename... _Args> |
118 | void |
119 | construct(_Up* __p, _Args&&... __args) |
120 | { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); } |
121 | |
122 | template<typename _Up> |
123 | void |
124 | destroy(_Up* __p) { __p->~_Up(); } |
125 | #else |
126 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
127 | // 402. wrong new expression in [some_] allocator::construct |
128 | void |
129 | construct(pointer __p, const _Tp& __val) |
130 | { ::new((void *)__p) _Tp(__val); } |
131 | |
132 | void |
133 | destroy(pointer __p) { __p->~_Tp(); } |
134 | #endif |
135 | }; |
136 | |
137 | template<typename _Tp> |
138 | inline bool |
139 | operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&) |
140 | { return true; } |
141 | |
142 | template<typename _Tp> |
143 | inline bool |
144 | operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&) |
145 | { return false; } |
146 | |
147 | _GLIBCXX_END_NAMESPACE_VERSION |
148 | } // namespace |
149 | |
150 | #endif |
151 | |