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https://github.com/bolero-MURAKAMI/Sprout.git
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76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
#ifndef SPROUT_INDEX_TUPLE_INTEGER_RANGE_HPP
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#define SPROUT_INDEX_TUPLE_INTEGER_RANGE_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_range
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//
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namespace detail {
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template<typename T, typename Seq, T Next>
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struct integer_range_next_even;
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template<typename T, T... Is, T Next>
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struct integer_range_next_even<T, sprout::integer_seq<T, Is...>, Next>
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: public sprout::integer_seq<T, Is..., (Is + Next)...>
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{};
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template<typename T, typename Seq, T Next, T Tail>
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struct integer_range_next_odd;
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template<typename T, T... Is, T Next, T Tail>
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struct integer_range_next_odd<T, sprout::integer_seq<T, Is...>, Next, Tail>
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: public sprout::integer_seq<T, Is..., (Is + Next)..., Tail>
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{};
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template<typename T, T First, std::ptrdiff_t Step, std::size_t N, typename Enable = void>
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struct integer_range_impl;
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template<typename T, T First, std::ptrdiff_t Step, std::size_t N>
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struct integer_range_impl<
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T, First, Step, 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 First, std::ptrdiff_t Step, std::size_t N>
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struct integer_range_impl<
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T, First, Step, 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, First>
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{};
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template<typename T, T First, std::ptrdiff_t Step, std::size_t N>
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struct integer_range_impl<
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T, First, Step, 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_range_next_even<
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T, typename sprout::detail::integer_range_impl<T, First, Step, N / 2>::type,
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N / 2 * Step
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>
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{};
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template<typename T, T First, std::ptrdiff_t Step, std::size_t N>
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struct integer_range_impl<
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T, First, Step, 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_range_next_odd<
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T, typename sprout::detail::integer_range_impl<T, First, Step, N / 2>::type,
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N / 2 * Step, First + (N - 1) * Step
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>
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{};
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} // namespace detail
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template<typename T, T First, T Last, std::ptrdiff_t Step = 1>
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struct integer_range
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: public sprout::detail::make_indexes_helper<
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sprout::detail::integer_range_impl<
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T, First, Step, ((Last - First) + (Step - 1)) / Step
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>
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>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_INDEX_TUPLE_INTEGER_RANGE_HPP
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