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sprout/integer/integer_digits.hpp 追加

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bolero-MURAKAMI 2011-11-14 12:16:43 +09:00
parent ae0755e626
commit 34e2c4d45a
1 changed files with 92 additions and 0 deletions
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sprout/integer/integer_digits.hpp Normal file
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#ifndef SPROUT_INTEGER_INTEGER_DIGITS_HPP
#define SPROUT_INTEGER_INTEGER_DIGITS_HPP
#include <cstddef>
#include <climits>
#include <type_traits>
#include <sprout/config.hpp>
namespace sprout {
namespace detail {
//
// integer_digits_impl
//
template<typename IntType, long N, long D>
struct integer_digits_impl
: public std::integral_constant<
std::size_t,
(CHAR_BIT * sizeof(IntType) - (std::is_signed<IntType>::value ? 1 : 0)) * N / D
+ ((CHAR_BIT * sizeof(IntType) - (std::is_signed<IntType>::value ? 1 : 0)) * N % D ? 1 : 0)
>
{};
} // namespace detail
//
// integer_digits
//
template<typename IntType, std::size_t Base>
struct integer_digits;
template<typename IntType>
struct integer_digits<IntType, 2>
: public sprout::detail::integer_digits_impl<IntType, 1, 1>
{};
template<typename IntType>
struct integer_digits<IntType, 3>
: public sprout::detail::integer_digits_impl<IntType, 630, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 4>
: public sprout::detail::integer_digits_impl<IntType, 1, 2>
{};
template<typename IntType>
struct integer_digits<IntType, 5>
: public sprout::detail::integer_digits_impl<IntType, 430, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 6>
: public sprout::detail::integer_digits_impl<IntType, 386, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 7>
: public sprout::detail::integer_digits_impl<IntType, 356, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 8>
: public sprout::detail::integer_digits_impl<IntType, 1, 3>
{};
template<typename IntType>
struct integer_digits<IntType, 9>
: public sprout::detail::integer_digits_impl<IntType, 315, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 10>
: public sprout::detail::integer_digits_impl<IntType, 301, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 11>
: public sprout::detail::integer_digits_impl<IntType, 289, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 12>
: public sprout::detail::integer_digits_impl<IntType, 278, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 13>
: public sprout::detail::integer_digits_impl<IntType, 270, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 14>
: public sprout::detail::integer_digits_impl<IntType, 262, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 15>
: public sprout::detail::integer_digits_impl<IntType, 255, 1000>
{};
template<typename IntType>
struct integer_digits<IntType, 16>
: public sprout::detail::integer_digits_impl<IntType, 1, 4>
{};
} // namespace sprout
#endif // #ifndef SPROUT_INTEGER_INTEGER_DIGITS_HPP