forked from enlightenment/efl
57 lines
1.8 KiB
C++
57 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 ELDBUS_CXX_ELDBUS_INTEGER_SEQUENCE_HH
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#define ELDBUS_CXX_ELDBUS_INTEGER_SEQUENCE_HH
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namespace efl { namespace eldbus { namespace _detail {
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template <typename T, T... Ints>
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struct integer_sequence
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{
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typedef T value_type;
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static constexpr std::size_t size() { return sizeof...(Ints); }
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typedef integer_sequence<T, Ints...> type;
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};
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template<class S1, class S2> struct concat;
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template<typename T, T... I1, T... I2>
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struct concat<integer_sequence<T, I1...>, integer_sequence<T, I2...> >
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: integer_sequence<T, I1..., (sizeof...(I1)+I2)...> {};
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template<class S1, class S2>
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using Concat = typename concat<S1, S2>::type;
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template<typename T, T N> struct gen_seq;
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template<typename T, T N> using make_integer_sequence = typename gen_seq<T, N>::type;
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template<typename T, T N>
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struct gen_seq : Concat<make_integer_sequence<T, N/2>
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, make_integer_sequence<T, N - N/2>>{};
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template<> struct gen_seq<std::size_t, 0> : integer_sequence<std::size_t>{};
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template<> struct gen_seq<std::size_t, 1> : integer_sequence<std::size_t, 0>{};
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template <std::size_t... I>
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using index_sequence = integer_sequence<std::size_t, I...>;
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template <std::size_t I>
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using make_index_sequence = make_integer_sequence<std::size_t, I>;
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} } }
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#endif
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