51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
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/*
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Copyright Barrett Adair 2016-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_CLBL_TRTS_DETAIL_POLYFILLS_MAKE_INDEX_SEQUENCE_HPP
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#define BOOST_CLBL_TRTS_DETAIL_POLYFILLS_MAKE_INDEX_SEQUENCE_HPP
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#undef BOOST_CLBL_TRTS_IX_SEQ
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#define BOOST_CLBL_TRTS_IX_SEQ(...) \
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::boost::callable_traits::detail::index_sequence<__VA_ARGS__>
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#undef BOOST_CLBL_TRTS_MAKE_IX_SEQ
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#define BOOST_CLBL_TRTS_MAKE_IX_SEQ(...) \
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::boost::callable_traits::detail::make_index_sequence<__VA_ARGS__>
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namespace boost { namespace callable_traits { namespace detail {
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template<std::size_t...>
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struct index_sequence { using type = index_sequence; };
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template<typename, typename>
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struct concat;
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template<std::size_t... I1, std::size_t... I2>
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struct concat<index_sequence<I1...>, index_sequence<I2...>>
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: index_sequence<I1..., (sizeof...(I1)+I2)...> {};
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template<std::size_t N>
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struct make_index_sequence_t;
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template<std::size_t N>
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struct make_index_sequence_t : concat<
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typename make_index_sequence_t<N/2>::type,
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typename make_index_sequence_t<N - N/2>::type >::type {};
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template<>
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struct make_index_sequence_t<0> : index_sequence<> {};
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template<>
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struct make_index_sequence_t<1> : index_sequence<0> {};
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template<std::size_t... I>
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using make_index_sequence = typename make_index_sequence_t<I...>::type;
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}}} // namespace boost::callable_traits::detail
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#endif // #ifndef BOOST_CLBL_TRTS_DETAIL_POLYFILLS_MAKE_INDEX_SEQUENCE_HPP
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