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Diffstat (limited to 'libstdc++-v3/include/ext/aligned_buffer.h')
-rw-r--r-- | libstdc++-v3/include/ext/aligned_buffer.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/libstdc++-v3/include/ext/aligned_buffer.h b/libstdc++-v3/include/ext/aligned_buffer.h new file mode 100644 index 00000000000..ffed88cd7d1 --- /dev/null +++ b/libstdc++-v3/include/ext/aligned_buffer.h @@ -0,0 +1,73 @@ +// Aligned memory buffer -*- C++ -*- + +// Copyright (C) 2013 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/>. + +/** @file ext/aligned_buffer.h + * This file is a GNU extension to the Standard C++ Library. + */ + +#ifndef _ALIGNED_BUFFER_H +#define _ALIGNED_BUFFER_H 1 + +#pragma GCC system_header + +#if __cplusplus >= 201103L +# include <type_traits> +#else +# include <bits/c++0x_warning.h> +#endif + +namespace __gnu_cxx +{ + template<typename _Tp> + struct __aligned_buffer + : std::aligned_storage<sizeof(_Tp), std::alignment_of<_Tp>::value> + { + typename + std::aligned_storage<sizeof(_Tp), std::alignment_of<_Tp>::value>::type + _M_storage; + + void* + _M_addr() noexcept + { + return static_cast<void*>(&_M_storage); + } + + const void* + _M_addr() const noexcept + { + return static_cast<const void*>(&_M_storage); + } + + _Tp* + _M_ptr() noexcept + { return static_cast<_Tp*>(_M_addr()); } + + const _Tp* + _M_ptr() const noexcept + { return static_cast<const _Tp*>(_M_addr()); } + }; + +} // namespace + +#endif /* _ALIGNED_BUFFER_H */ |