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73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
#ifndef SPROUT_INDEX_TUPLE_INTEGER_N_HPP
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#define SPROUT_INDEX_TUPLE_INTEGER_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/integer_seq.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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// integer_n
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//
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namespace detail {
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template<typename T, typename Seq>
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struct integer_n_next_even;
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template<typename T, T... Is>
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struct integer_n_next_even<T, sprout::integer_seq<T, Is...> >
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: public sprout::integer_seq<T, Is..., Is...>
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{};
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template<typename T, typename Seq, T Tail>
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struct integer_n_next_even_odd;
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template<typename T, T... Is, T Tail>
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struct integer_n_next_even_odd<T, sprout::integer_seq<T, Is...>, Tail>
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: public sprout::integer_seq<T, Is..., Is..., Tail>
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{};
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template<typename T, T I, std::size_t N, typename Enable = void>
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struct integer_n_impl;
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template<typename T, T I, std::size_t N>
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struct integer_n_impl<
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T, I, N,
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typename std::enable_if<(N == 0)>::type
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>
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: public sprout::integer_seq<T>
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{};
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template<typename T, T I, std::size_t N>
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struct integer_n_impl<
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T, I, N,
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typename std::enable_if<(N == 1)>::type
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>
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: public sprout::integer_seq<T, I>
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{};
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template<typename T, T I, std::size_t N>
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struct integer_n_impl<
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T, I, 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::integer_n_next_even<
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T, typename sprout::detail::integer_n_impl<T, I, N / 2>::type
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>
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{};
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template<typename T, T I, std::size_t N>
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struct integer_n_impl<
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T, I, 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::integer_n_next_even_odd<
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T, typename sprout::detail::integer_n_impl<T, 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<typename T, T I, std::size_t N>
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struct integer_n
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: public sprout::detail::make_indexes_helper<
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sprout::detail::integer_n_impl<T, 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_INTEGER_N_HPP
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