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// Aligned memory buffer -*- C++ -*-
// Copyright (C) 2013-2014 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;
__aligned_buffer() = default;
// Can be used to avoid value-initialization
__aligned_buffer(std::nullptr_t) { }
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 */
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