forked from enlightenment/efl
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
/*
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* Copyright 2019 by its authors. See AUTHORS.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef EFL_EINA_EINA_ALIGNED_UNION_HH_
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#define EFL_EINA_EINA_ALIGNED_UNION_HH_
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namespace efl { namespace eina { namespace _mpl {
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template <std::size_t...Numbers>
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struct max;
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template <std::size_t A0>
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struct max<A0> : std::integral_constant<std::size_t, A0> {};
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template <std::size_t A0, std::size_t A1, std::size_t...Args>
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struct max<A0, A1, Args...> : max<(A0 > A1 ? A0 : A1), Args...> {};
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}
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// Workaround needed for GCC before 5.1
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template <std::size_t Min, typename...Args>
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struct aligned_union
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{
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static constexpr std::size_t alignment_value = _mpl::max<alignof(Args)...>::value;
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typedef typename std::aligned_storage
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< _mpl::max<Min, sizeof(Args)...>::value
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, alignment_value >::type type;
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};
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} }
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#endif
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