f2e2de5f85
* include/Makefile.am: Add ext/aligned_buffer.h * include/Makefile.in: Regenerate. * include/ext/aligned_buffer.h: New. * include/std/future (_Result): Use __aligned_buffer. * include/bits/forward_list.h (_Fwd_list_node): Likewise. * include/bits/shared_ptr_base.h (_Sp_counted_ptr_inplace): Likewise. * testsuite/20_util/shared_ptr/cons/43820_neg.cc: Adjust dg-error line number. From-SVN: r197554
74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
// Aligned memory buffer -*- C++ -*-
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// Copyright (C) 2013 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file ext/aligned_buffer.h
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* This file is a GNU extension to the Standard C++ Library.
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*/
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#ifndef _ALIGNED_BUFFER_H
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#define _ALIGNED_BUFFER_H 1
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#pragma GCC system_header
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#if __cplusplus >= 201103L
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# include <type_traits>
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#else
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# include <bits/c++0x_warning.h>
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#endif
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namespace __gnu_cxx
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{
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template<typename _Tp>
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struct __aligned_buffer
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: std::aligned_storage<sizeof(_Tp), std::alignment_of<_Tp>::value>
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{
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typename
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std::aligned_storage<sizeof(_Tp), std::alignment_of<_Tp>::value>::type
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_M_storage;
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void*
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_M_addr() noexcept
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{
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return static_cast<void*>(&_M_storage);
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}
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const void*
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_M_addr() const noexcept
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{
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return static_cast<const void*>(&_M_storage);
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}
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_Tp*
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_M_ptr() noexcept
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{ return static_cast<_Tp*>(_M_addr()); }
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const _Tp*
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_M_ptr() const noexcept
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{ return static_cast<const _Tp*>(_M_addr()); }
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};
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} // namespace
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#endif /* _ALIGNED_BUFFER_H */
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