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https://github.com/bolero-MURAKAMI/Sprout.git
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81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
#ifndef SPROUT_INDEX_TUPLE_INDEX_N_HPP
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#define SPROUT_INDEX_TUPLE_INDEX_N_HPP
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#include <cstddef>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/index_tuple/index_tuple.hpp>
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#include <sprout/index_tuple/detail/make_indexes_helper.hpp>
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namespace sprout {
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//
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// index_n
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//
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namespace detail {
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template<typename IndexTuple>
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struct index_n_next;
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template<sprout::index_t... Indexes>
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struct index_n_next<sprout::index_tuple<Indexes...>> {
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public:
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typedef sprout::index_tuple<Indexes..., Indexes...> type;
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};
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template<typename IndexTuple, sprout::index_t Tail>
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struct index_n_next2;
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template<sprout::index_t... Indexes, sprout::index_t Tail>
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struct index_n_next2<sprout::index_tuple<Indexes...>, Tail> {
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public:
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typedef sprout::index_tuple<Indexes..., Indexes..., Tail> type;
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};
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template<sprout::index_t I, std::size_t N, typename Enable = void>
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struct index_n_impl;
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template<sprout::index_t I, std::size_t N>
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struct index_n_impl<
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I,
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N,
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typename std::enable_if<(N == 0)>::type
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> {
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public:
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typedef sprout::index_tuple<> type;
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};
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template<sprout::index_t I, std::size_t N>
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struct index_n_impl<
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I,
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N,
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typename std::enable_if<(N == 1)>::type
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> {
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public:
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typedef sprout::index_tuple<I> type;
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};
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template<sprout::index_t I, std::size_t N>
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struct index_n_impl<
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I,
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N,
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typename std::enable_if<(N > 1 && N % 2 == 0)>::type
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>
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: public sprout::detail::index_n_next<
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typename sprout::detail::index_n_impl<I, N / 2>::type
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>
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{};
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template<sprout::index_t I, std::size_t N>
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struct index_n_impl<
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I,
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N,
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typename std::enable_if<(N > 1 && N % 2 == 1)>::type
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>
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: public sprout::detail::index_n_next2<
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typename sprout::detail::index_n_impl<I, N / 2>::type,
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I
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>
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{};
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} // namespace detail
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template<sprout::index_t I, std::size_t N>
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struct index_n
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: public sprout::detail::make_indexes_helper<
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sprout::detail::index_n_impl<I, N>
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>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_INDEX_TUPLE_INDEX_N_HPP
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