1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
// <memory> -*- C++ -*-
// Copyright (C) 2001-2015 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/*
* Copyright (c) 1997-1999
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*/
/** @file include/memory
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_MEMORY
#define _GLIBCXX_MEMORY 1
#pragma GCC system_header
/**
* @defgroup memory Memory
* @ingroup utilities
*
* Components for memory allocation, deallocation, and management.
*/
/**
* @defgroup pointer_abstractions Pointer Abstractions
* @ingroup memory
*
* Smart pointers, etc.
*/
#include <bits/stl_algobase.h>
#include <bits/allocator.h>
#include <bits/stl_construct.h>
#include <bits/stl_uninitialized.h>
#include <bits/stl_tempbuf.h>
#include <bits/stl_raw_storage_iter.h>
#if __cplusplus >= 201103L
# include <exception> // std::exception
# include <typeinfo> // std::type_info in get_deleter
# include <iosfwd> // std::basic_ostream
# include <ext/atomicity.h>
# include <ext/concurrence.h>
# include <bits/functexcept.h>
# include <bits/stl_function.h> // std::less
# include <bits/uses_allocator.h>
# include <type_traits>
# include <functional>
# include <debug/debug.h>
# include <bits/unique_ptr.h>
# include <bits/shared_ptr.h>
# include <bits/shared_ptr_atomic.h>
# if _GLIBCXX_USE_DEPRECATED
# include <backward/auto_ptr.h>
# endif
#else
# include <backward/auto_ptr.h>
#endif
#if __cplusplus >= 201103L
# include <cstdint>
# ifdef _GLIBCXX_USE_C99_STDINT_TR1
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @brief Fit aligned storage in buffer.
*
* [ptr.align]
*
* This function tries to fit @a __size bytes of storage with alignment
* @a __align into the buffer @a __ptr of size @a __space bytes. If such
* a buffer fits then @a __ptr is changed to point to the first byte of the
* aligned storage and @a __space is reduced by the bytes used for alignment.
*
* @param __align A fundamental or extended alignment value.
* @param __size Size of the aligned storage required.
* @param __ptr Pointer to a buffer of @a __space bytes.
* @param __space Size of the buffer pointed to by @a __ptr.
* @return the updated pointer if the aligned storage fits, otherwise nullptr.
*/
inline void*
align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept
{
const auto __intptr = reinterpret_cast<uintptr_t>(__ptr);
const auto __aligned = (__intptr - 1u + __align) & -__align;
const auto __diff = __aligned - __intptr;
if ((__size + __diff) > __space)
return nullptr;
else
{
__space -= __diff;
return __ptr = reinterpret_cast<void*>(__aligned);
}
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // _GLIBCXX_USE_C99_STDINT_TR1
#endif // C++11
#endif /* _GLIBCXX_MEMORY */
|
