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sprout/random/additive_combine.hpp 追加

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sprout/random/additive_combine.hpp 追加
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bolero-MURAKAMI 2011-10-18 22:28:32 +09:00
parent 01a0ce4380
commit ae589d7fc0
6 changed files with 301 additions and 20 deletions
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52
sprout/detail/integer/static_log2.hpp Normal file
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#ifndef SPROUT_DETAIL_INTEGER_STATIC_LOG2_HPP
#define SPROUT_DETAIL_INTEGER_STATIC_LOG2_HPP
#include <cstdint>
#include <sprout/config.hpp>
namespace sprout {
namespace detail {
typedef std::uintmax_t static_log2_argument_type;
typedef int static_log2_result_type;
namespace static_log2_impl {
typedef sprout::detail::static_log2_argument_type argument_type;
typedef sprout::detail::static_log2_result_type result_type;
template<result_type n>
struct choose_initial_n {
SPROUT_STATIC_CONSTEXPR bool c = (sprout::detail::static_log2_impl::argument_type(1) << n << n) != 0;
SPROUT_STATIC_CONSTEXPR sprout::detail::static_log2_impl::result_type value = !c * n + choose_initial_n<2 * c * n>::value;
};
template<>
struct choose_initial_n<0> {
SPROUT_STATIC_CONSTEXPR sprout::detail::static_log2_impl::result_type value = 0;
};
SPROUT_STATIC_CONSTEXPR sprout::detail::static_log2_impl::result_type n_zero = 16;
SPROUT_STATIC_CONSTEXPR sprout::detail::static_log2_impl::result_type initial_n = sprout::detail::static_log2_impl::choose_initial_n<n_zero>::value;
template<
sprout::detail::static_log2_impl::argument_type x,
sprout::detail::static_log2_impl::result_type n = sprout::detail::static_log2_impl::initial_n
>
struct static_log2_impl {
SPROUT_STATIC_CONSTEXPR bool c = (x >> n) > 0;
SPROUT_STATIC_CONSTEXPR sprout::detail::static_log2_impl::result_type value = c * n + (static_log2_impl<(x >> c * n), n / 2>::value);
};
template<>
struct static_log2_impl<1, 0> {
SPROUT_STATIC_CONSTEXPR sprout::detail::static_log2_impl::result_type value = 0;
};
} // namespace static_log2_impl
template<sprout::detail::static_log2_argument_type x>
struct static_log2 {
SPROUT_STATIC_CONSTEXPR sprout::detail::static_log2_result_type value = sprout::detail::static_log2_impl::static_log2_impl<x>::value;
};
template<>
struct static_log2<0> {};
} // namespace detail
} // namespace sprout
#endif // #ifndef SPROUT_DETAIL_INTEGER_STATIC_LOG2_HPP