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https://github.com/bolero-MURAKAMI/Sprout.git
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59 lines
1.2 KiB
C++
59 lines
1.2 KiB
C++
#ifndef SPROUT_INDEX_TUPLE_HPP
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#define SPROUT_INDEX_TUPLE_HPP
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#include <cstddef>
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#include <sprout/config.hpp>
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namespace sprout {
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//
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// index_tuple
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//
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template<std::ptrdiff_t... Indexes>
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struct index_tuple {};
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//
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// index_range
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//
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template<
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std::ptrdiff_t First,
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std::ptrdiff_t Last,
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std::ptrdiff_t Step = 1,
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typename Acc = sprout::index_tuple<>,
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bool Break = (First >= Last)
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>
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struct index_range {
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typedef Acc type;
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};
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template<
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std::ptrdiff_t First,
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std::ptrdiff_t Last,
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std::ptrdiff_t Step,
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std::ptrdiff_t ...Indexes
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>
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struct index_range<First, Last, Step, sprout::index_tuple<Indexes...>, false>
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: public sprout::index_range<First + Step, Last, Step, sprout::index_tuple<Indexes..., First> >
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{};
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//
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// index_n
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//
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template<
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std::ptrdiff_t I,
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std::ptrdiff_t N,
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typename Acc = sprout::index_tuple<>,
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bool Break = (N == 0)
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>
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struct index_n {
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typedef Acc type;
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};
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template<
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std::ptrdiff_t I,
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std::ptrdiff_t N,
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std::ptrdiff_t ...Indexes
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>
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struct index_n<I, N, sprout::index_tuple<Indexes...>, false>
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: public sprout::index_n<I, N - 1, sprout::index_tuple<Indexes..., I> >
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_INDEX_TUPLE_HPP
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