forked from enlightenment/efl
58 lines
1.8 KiB
C++
58 lines
1.8 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 EOLIAN_CXX_META_HH_
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#define EOLIAN_CXX_META_HH_
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#include <utility>
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#include <type_traits>
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namespace efl { namespace eolian { namespace grammar { namespace meta {
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template <std::size_t A0, std::size_t A1 = 0, std::size_t...args>
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struct max : max<((A0 > A1) ? A0 : A1), args...> {};
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template <std::size_t A0, std::size_t A1>
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struct max<A0, A1> : std::integral_constant<std::size_t, (A0 > A1 ? A0 : A1)> {};
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template <typename T>
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struct identity { typedef T type; };
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template <typename T, typename U, typename...Others>
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struct is_one_of : std::conditional<std::is_same<T, U>::value
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, std::is_same<T, U>
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, is_one_of<T, Others...> >::type::type
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{};
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template <typename T, typename U>
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struct is_one_of<T, U> : std::is_same<T, U>
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{};
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template <std::size_t size, typename T, typename U, typename...Args>
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struct find_impl : find_impl<size+1, T, Args...>
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{};
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template <std::size_t size, typename T, typename...Args>
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struct find_impl<size, T, T, Args...> : std::integral_constant<std::size_t, size> {};
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template <typename T, typename U, typename...Args>
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struct find : find_impl<0u, T, U, Args...>
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{};
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} } } }
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#endif
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