1 // Aligned memory buffer -*- C++ -*-
2 
3 // Copyright (C) 2013-2014 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/aligned_buffer.h
26  *  This file is a GNU extension to the Standard C++ Library.
27  */
28 
29 #ifndef _ALIGNED_BUFFER_H
30 #define _ALIGNED_BUFFER_H 1
31 
32 #pragma GCC system_header
33 
34 #if __cplusplus >= 201103L
35 # include <type_traits>
36 #else
37 # include <bits/c++0x_warning.h>
38 #endif
39 
40 namespace __gnu_cxx
41 {
42   template<typename _Tp>
43     struct __aligned_buffer
44     : std::aligned_storage<sizeof(_Tp), std::alignment_of<_Tp>::value>
45     {
46       typename
47 	std::aligned_storage<sizeof(_Tp), std::alignment_of<_Tp>::value>::type
48 	_M_storage;
49 
50       void*
_M_addr__aligned_buffer51       _M_addr() noexcept
52       {
53         return static_cast<void*>(&_M_storage);
54       }
55 
56       const void*
_M_addr__aligned_buffer57       _M_addr() const noexcept
58       {
59         return static_cast<const void*>(&_M_storage);
60       }
61 
62       _Tp*
_M_ptr__aligned_buffer63       _M_ptr() noexcept
64       { return static_cast<_Tp*>(_M_addr()); }
65 
66       const _Tp*
_M_ptr__aligned_buffer67       _M_ptr() const noexcept
68       { return static_cast<const _Tp*>(_M_addr()); }
69     };
70 
71 } // namespace
72 
73 #endif /* _ALIGNED_BUFFER_H */
74