Merge trunk version 206243 into gupc branch.
[official-gcc.git] / libstdc++-v3 / include / ext / aligned_buffer.h
blobffed88cd7d10096e775435cd591020da6f44d6a6
1 // Aligned memory buffer -*- C++ -*-
3 // Copyright (C) 2013 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.
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.
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.
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/>.
25 /** @file ext/aligned_buffer.h
26 * This file is a GNU extension to the Standard C++ Library.
29 #ifndef _ALIGNED_BUFFER_H
30 #define _ALIGNED_BUFFER_H 1
32 #pragma GCC system_header
34 #if __cplusplus >= 201103L
35 # include <type_traits>
36 #else
37 # include <bits/c++0x_warning.h>
38 #endif
40 namespace __gnu_cxx
42 template<typename _Tp>
43 struct __aligned_buffer
44 : std::aligned_storage<sizeof(_Tp), std::alignment_of<_Tp>::value>
46 typename
47 std::aligned_storage<sizeof(_Tp), std::alignment_of<_Tp>::value>::type
48 _M_storage;
50 void*
51 _M_addr() noexcept
53 return static_cast<void*>(&_M_storage);
56 const void*
57 _M_addr() const noexcept
59 return static_cast<const void*>(&_M_storage);
62 _Tp*
63 _M_ptr() noexcept
64 { return static_cast<_Tp*>(_M_addr()); }
66 const _Tp*
67 _M_ptr() const noexcept
68 { return static_cast<const _Tp*>(_M_addr()); }
71 } // namespace
73 #endif /* _ALIGNED_BUFFER_H */