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index_n 再実装

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bolero-MURAKAMI 2012-02-28 15:02:56 +09:00
parent 8ad87d104d
commit 3078d76ceb
1 changed files with 55 additions and 17 deletions
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72
sprout/index_tuple.hpp
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@ -98,32 +98,70 @@ namespace sprout {
// index_n
//
namespace detail {
template<
sprout::index_t I,
std::size_t N,
typename Acc,
bool Break = (N == 0)
>
struct index_n_impl {
template<typename IndexTuple>
struct index_n_next;
template<sprout::index_t... Indexes>
struct index_n_next<sprout::index_tuple<Indexes...>> {
public:
typedef Acc type;
typedef sprout::index_tuple<Indexes..., Indexes...> type;
};
template<
sprout::index_t I,
std::size_t N,
sprout::index_t... Indexes
template<typename IndexTuple, sprout::index_t Tail>
struct index_n_next2;
template<sprout::index_t... Indexes, sprout::index_t Tail>
struct index_n_next2<sprout::index_tuple<Indexes...>, Tail> {
public:
typedef sprout::index_tuple<Indexes..., Indexes..., Tail> type;
};
template<sprout::index_t I, std::size_t N, typename Enable = void>
struct index_n_impl;
template<sprout::index_t I, std::size_t N>
struct index_n_impl<
I,
N,
typename std::enable_if<(N == 0)>::type
> {
public:
typedef sprout::index_tuple<> type;
};
template<sprout::index_t I, std::size_t N>
struct index_n_impl<
I,
N,
typename std::enable_if<(N == 1)>::type
> {
public:
typedef sprout::index_tuple<I> type;
};
template<sprout::index_t I, std::size_t N>
struct index_n_impl<
I,
N,
typename std::enable_if<(N > 1 && N % 2 == 0)>::type
>
struct index_n_impl<I, N, sprout::index_tuple<Indexes...>, false>
: public sprout::detail::index_n_impl<I, N - 1, sprout::index_tuple<Indexes..., I> >
: public sprout::detail::index_n_next<
typename sprout::detail::index_n_impl<I, N / 2>::type
>
{};
template<sprout::index_t I, std::size_t N>
struct index_n_impl<
I,
N,
typename std::enable_if<(N > 1 && N % 2 == 1)>::type
>
: public sprout::detail::index_n_next2<
typename sprout::detail::index_n_impl<I, N / 2>::type,
I
>
{};
} // namespace detail
template<
sprout::index_t I,
std::size_t N,
typename Acc = sprout::index_tuple<>
std::size_t N
>
struct index_n
: public sprout::detail::index_n_impl<I, N, Acc>
: public sprout::detail::index_n_impl<I, N>
{};
} // namespace sprout