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d38d4e5d | 1 | // Allocator that wraps "C" malloc -*- C++ -*- |
1ff9402d | 2 | |
882b3d5c | 3 | // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
113008b5 | 4 | // Free Software Foundation, Inc. |
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5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
748086b7 | 9 | // Free Software Foundation; either version 3, or (at your option) |
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10 | // any later version. |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
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17 | // Under Section 7 of GPL version 3, you are granted additional |
18 | // permissions described in the GCC Runtime Library Exception, version | |
19 | // 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | // You should have received a copy of the GNU General Public License and | |
22 | // a copy of the GCC Runtime Library Exception along with this program; | |
23 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | // <http://www.gnu.org/licenses/>. | |
1ff9402d | 25 | |
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26 | /** @file ext/malloc_allocator.h |
27 | * This file is a GNU extension to the Standard C++ Library. | |
28 | */ | |
29 | ||
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30 | #ifndef _MALLOC_ALLOCATOR_H |
31 | #define _MALLOC_ALLOCATOR_H 1 | |
32 | ||
4ec3604f | 33 | #include <cstdlib> |
d38d4e5d | 34 | #include <new> |
a063e891 | 35 | #include <bits/functexcept.h> |
ca0f8fd1 | 36 | #include <bits/move.h> |
1ff9402d | 37 | |
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38 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
39 | { | |
40 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
3cbc7af0 | 41 | |
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42 | using std::size_t; |
43 | using std::ptrdiff_t; | |
44 | ||
1ff9402d | 45 | /** |
0aa06b18 | 46 | * @brief An allocator that uses malloc. |
5b9daa7e | 47 | * @ingroup allocators |
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48 | * |
49 | * This is precisely the allocator defined in the C++ Standard. | |
50 | * - all allocation calls malloc | |
51 | * - all deallocation calls free | |
1ff9402d | 52 | */ |
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53 | template<typename _Tp> |
54 | class malloc_allocator | |
1ff9402d | 55 | { |
1ff9402d | 56 | public: |
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57 | typedef size_t size_type; |
58 | typedef ptrdiff_t difference_type; | |
59 | typedef _Tp* pointer; | |
60 | typedef const _Tp* const_pointer; | |
61 | typedef _Tp& reference; | |
62 | typedef const _Tp& const_reference; | |
63 | typedef _Tp value_type; | |
1ff9402d | 64 | |
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65 | template<typename _Tp1> |
66 | struct rebind | |
67 | { typedef malloc_allocator<_Tp1> other; }; | |
1ff9402d | 68 | |
d38d4e5d | 69 | malloc_allocator() throw() { } |
1ff9402d | 70 | |
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71 | malloc_allocator(const malloc_allocator&) throw() { } |
72 | ||
73 | template<typename _Tp1> | |
74 | malloc_allocator(const malloc_allocator<_Tp1>&) throw() { } | |
75 | ||
76 | ~malloc_allocator() throw() { } | |
77 | ||
78 | pointer | |
882b3d5c | 79 | address(reference __x) const { return std::__addressof(__x); } |
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80 | |
81 | const_pointer | |
882b3d5c | 82 | address(const_reference __x) const { return std::__addressof(__x); } |
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83 | |
84 | // NB: __n is permitted to be 0. The C++ standard says nothing | |
85 | // about what the return value is when __n == 0. | |
86 | pointer | |
90f8b692 | 87 | allocate(size_type __n, const void* = 0) |
58c95921 | 88 | { |
e762c6f4 | 89 | if (__n > this->max_size()) |
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90 | std::__throw_bad_alloc(); |
91 | ||
113008b5 | 92 | pointer __ret = static_cast<_Tp*>(std::malloc(__n * sizeof(_Tp))); |
58c95921 | 93 | if (!__ret) |
a063e891 | 94 | std::__throw_bad_alloc(); |
58c95921 DM |
95 | return __ret; |
96 | } | |
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97 | |
98 | // __p is not permitted to be a null pointer. | |
99 | void | |
dcec0389 | 100 | deallocate(pointer __p, size_type) |
113008b5 | 101 | { std::free(static_cast<void*>(__p)); } |
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102 | |
103 | size_type | |
104 | max_size() const throw() | |
105 | { return size_t(-1) / sizeof(_Tp); } | |
106 | ||
107 | // _GLIBCXX_RESOLVE_LIB_DEFECTS | |
108 | // 402. wrong new expression in [some_] allocator::construct | |
109 | void | |
110 | construct(pointer __p, const _Tp& __val) | |
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111 | { ::new((void *)__p) value_type(__val); } |
112 | ||
113 | #ifdef __GXX_EXPERIMENTAL_CXX0X__ | |
114 | template<typename... _Args> | |
115 | void | |
116 | construct(pointer __p, _Args&&... __args) | |
117 | { ::new((void *)__p) _Tp(std::forward<_Args>(__args)...); } | |
118 | #endif | |
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119 | |
120 | void | |
121 | destroy(pointer __p) { __p->~_Tp(); } | |
1ff9402d | 122 | }; |
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123 | |
124 | template<typename _Tp> | |
125 | inline bool | |
126 | operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) | |
127 | { return true; } | |
128 | ||
129 | template<typename _Tp> | |
130 | inline bool | |
131 | operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) | |
132 | { return false; } | |
3cbc7af0 | 133 | |
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134 | _GLIBCXX_END_NAMESPACE_VERSION |
135 | } // namespace | |
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136 | |
137 | #endif |