1 | // <memory> -*- C++ -*- |
2 | |
3 | // Copyright (C) 2001-2017 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 | /* |
26 | * Copyright (c) 1997-1999 |
27 | * Silicon Graphics Computer Systems, Inc. |
28 | * |
29 | * Permission to use, copy, modify, distribute and sell this software |
30 | * and its documentation for any purpose is hereby granted without fee, |
31 | * provided that the above copyright notice appear in all copies and |
32 | * that both that copyright notice and this permission notice appear |
33 | * in supporting documentation. Silicon Graphics makes no |
34 | * representations about the suitability of this software for any |
35 | * purpose. It is provided "as is" without express or implied warranty. |
36 | * |
37 | */ |
38 | |
39 | /** @file include/memory |
40 | * This is a Standard C++ Library header. |
41 | */ |
42 | |
43 | #ifndef _GLIBCXX_MEMORY |
44 | #define _GLIBCXX_MEMORY 1 |
45 | |
46 | #pragma GCC system_header |
47 | |
48 | /** |
49 | * @defgroup memory Memory |
50 | * @ingroup utilities |
51 | * |
52 | * Components for memory allocation, deallocation, and management. |
53 | */ |
54 | |
55 | /** |
56 | * @defgroup pointer_abstractions Pointer Abstractions |
57 | * @ingroup memory |
58 | * |
59 | * Smart pointers, etc. |
60 | */ |
61 | |
62 | #include <bits/stl_algobase.h> |
63 | #include <bits/allocator.h> |
64 | #include <bits/stl_construct.h> |
65 | #include <bits/stl_uninitialized.h> |
66 | #include <bits/stl_tempbuf.h> |
67 | #include <bits/stl_raw_storage_iter.h> |
68 | |
69 | #if __cplusplus >= 201103L |
70 | # include <exception> // std::exception |
71 | # include <typeinfo> // std::type_info in get_deleter |
72 | # include <iosfwd> // std::basic_ostream |
73 | # include <ext/atomicity.h> |
74 | # include <ext/concurrence.h> |
75 | # include <bits/functexcept.h> |
76 | # include <bits/stl_function.h> // std::less |
77 | # include <bits/uses_allocator.h> |
78 | # include <type_traits> |
79 | # include <debug/debug.h> |
80 | # include <bits/unique_ptr.h> |
81 | # include <bits/shared_ptr.h> |
82 | # include <bits/shared_ptr_atomic.h> |
83 | # if _GLIBCXX_USE_DEPRECATED |
84 | # include <backward/auto_ptr.h> |
85 | # endif |
86 | #else |
87 | # include <backward/auto_ptr.h> |
88 | #endif |
89 | |
90 | #if __cplusplus >= 201103L |
91 | # include <cstdint> |
92 | # ifdef _GLIBCXX_USE_C99_STDINT_TR1 |
93 | namespace std _GLIBCXX_VISIBILITY(default) |
94 | { |
95 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
96 | |
97 | /** |
98 | * @brief Fit aligned storage in buffer. |
99 | * |
100 | * [ptr.align] |
101 | * |
102 | * This function tries to fit @a __size bytes of storage with alignment |
103 | * @a __align into the buffer @a __ptr of size @a __space bytes. If such |
104 | * a buffer fits then @a __ptr is changed to point to the first byte of the |
105 | * aligned storage and @a __space is reduced by the bytes used for alignment. |
106 | * |
107 | * @param __align A fundamental or extended alignment value. |
108 | * @param __size Size of the aligned storage required. |
109 | * @param __ptr Pointer to a buffer of @a __space bytes. |
110 | * @param __space Size of the buffer pointed to by @a __ptr. |
111 | * @return the updated pointer if the aligned storage fits, otherwise nullptr. |
112 | */ |
113 | inline void* |
114 | align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept |
115 | { |
116 | const auto __intptr = reinterpret_cast<uintptr_t>(__ptr); |
117 | const auto __aligned = (__intptr - 1u + __align) & -__align; |
118 | const auto __diff = __aligned - __intptr; |
119 | if ((__size + __diff) > __space) |
120 | return nullptr; |
121 | else |
122 | { |
123 | __space -= __diff; |
124 | return __ptr = reinterpret_cast<void*>(__aligned); |
125 | } |
126 | } |
127 | |
128 | // 20.7.4 [util.dynamic.safety], pointer safety |
129 | |
130 | enum class pointer_safety { relaxed, preferred, strict }; |
131 | |
132 | inline void |
133 | declare_reachable(void*) { } |
134 | |
135 | template <typename _Tp> |
136 | inline _Tp* |
137 | undeclare_reachable(_Tp* __p) { return __p; } |
138 | |
139 | inline void |
140 | declare_no_pointers(char*, size_t) { } |
141 | |
142 | inline void |
143 | undeclare_no_pointers(char*, size_t) { } |
144 | |
145 | inline pointer_safety |
146 | get_pointer_safety() noexcept { return pointer_safety::relaxed; } |
147 | |
148 | _GLIBCXX_END_NAMESPACE_VERSION |
149 | } // namespace |
150 | #endif // _GLIBCXX_USE_C99_STDINT_TR1 |
151 | #endif // C++11 |
152 | |
153 | #endif /* _GLIBCXX_MEMORY */ |
154 | |