72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/*
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Copyright (c) 2017, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_ALIGNED_UNION_HPP_INCLUDE
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#define TORRENT_ALIGNED_UNION_HPP_INCLUDE
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#include <type_traits>
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namespace libtorrent { namespace aux {
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#if defined __GNUC__ && __GNUC__ < 5 && !defined(_LIBCPP_VERSION)
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constexpr std::size_t max(std::size_t a)
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{ return a; }
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constexpr std::size_t max(std::size_t a, std::size_t b)
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{ return a > b ? a : b; }
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template <typename... Vals>
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constexpr std::size_t max(std::size_t a, std::size_t b, Vals... v)
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{ return max(a, max(b, v...)); }
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// this is for backwards compatibility with not-quite C++11 compilers
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template <std::size_t Len, typename... Types>
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struct aligned_union
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{
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struct type
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{
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alignas(max(alignof(Types)...))
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char buffer[max(Len, max(sizeof(Types)...))];
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};
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};
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#else
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using std::aligned_union;
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#endif
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}}
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#endif
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