mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
#ifndef SPROUT_INDEX_TUPLE_INDEX_RANGE_HPP
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#define SPROUT_INDEX_TUPLE_INDEX_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/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_range
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//
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namespace detail {
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template<typename IndexTuple, sprout::index_t Next>
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struct index_range_next;
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template<sprout::index_t... Indexes, sprout::index_t Next>
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struct index_range_next<sprout::index_tuple<Indexes...>, Next> {
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public:
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typedef sprout::index_tuple<Indexes..., (Indexes + Next)...> type;
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};
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template<typename IndexTuple, sprout::index_t Next, sprout::index_t Tail>
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struct index_range_next2;
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template<sprout::index_t... Indexes, sprout::index_t Next, sprout::index_t Tail>
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struct index_range_next2<sprout::index_tuple<Indexes...>, Next, Tail> {
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public:
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typedef sprout::index_tuple<Indexes..., (Indexes + Next)..., Tail> type;
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};
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template<sprout::index_t First, sprout::index_t Step, std::size_t N, typename Enable = void>
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struct index_range_impl;
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template<sprout::index_t First, sprout::index_t Step, std::size_t N>
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struct index_range_impl<
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First,
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Step,
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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 First, sprout::index_t Step, std::size_t N>
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struct index_range_impl<
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First,
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Step,
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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<First> type;
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};
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template<sprout::index_t First, sprout::index_t Step, std::size_t N>
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struct index_range_impl<
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First,
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Step,
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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_range_next<
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typename sprout::detail::index_range_impl<First, Step, N / 2>::type,
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First + N / 2 * Step
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>
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{};
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template<sprout::index_t First, sprout::index_t Step, std::size_t N>
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struct index_range_impl<
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First,
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Step,
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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_range_next2<
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typename sprout::detail::index_range_impl<First, Step, N / 2>::type,
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First + N / 2 * Step,
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First + (N - 1) * Step
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>
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{};
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} // namespace detail
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template<sprout::index_t First, sprout::index_t Last, sprout::index_t Step = 1>
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struct index_range
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: public sprout::detail::make_indexes_helper<
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sprout::detail::index_range_impl<
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First,
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Step,
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((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_INDEX_RANGE_HPP
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