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https://github.com/bolero-MURAKAMI/Sprout.git
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89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
#ifndef SPROUT_INTEGER_INTEGER_DIGITS_HPP
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#define SPROUT_INTEGER_INTEGER_DIGITS_HPP
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#include <cstddef>
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#include <climits>
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#include <type_traits>
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#include <sprout/config.hpp>
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namespace sprout {
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namespace detail {
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template<typename IntType, long N, long D>
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struct integer_digits_impl
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: public std::integral_constant<
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std::size_t,
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(CHAR_BIT * sizeof(IntType) - (std::is_signed<IntType>::value ? 1 : 0)) * N / D
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+ ((CHAR_BIT * sizeof(IntType) - (std::is_signed<IntType>::value ? 1 : 0)) * N % D ? 1 : 0)
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>
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{};
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} // namespace detail
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//
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// integer_digits
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//
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template<typename IntType, std::size_t Base = 10>
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struct integer_digits;
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template<typename IntType>
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struct integer_digits<IntType, 2>
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: public sprout::detail::integer_digits_impl<IntType, 1, 1>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 3>
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: public sprout::detail::integer_digits_impl<IntType, 630, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 4>
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: public sprout::detail::integer_digits_impl<IntType, 1, 2>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 5>
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: public sprout::detail::integer_digits_impl<IntType, 430, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 6>
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: public sprout::detail::integer_digits_impl<IntType, 386, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 7>
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: public sprout::detail::integer_digits_impl<IntType, 356, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 8>
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: public sprout::detail::integer_digits_impl<IntType, 1, 3>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 9>
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: public sprout::detail::integer_digits_impl<IntType, 315, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 10>
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: public sprout::detail::integer_digits_impl<IntType, 301, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 11>
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: public sprout::detail::integer_digits_impl<IntType, 289, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 12>
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: public sprout::detail::integer_digits_impl<IntType, 278, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 13>
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: public sprout::detail::integer_digits_impl<IntType, 270, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 14>
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: public sprout::detail::integer_digits_impl<IntType, 262, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 15>
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: public sprout::detail::integer_digits_impl<IntType, 255, 1000>
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{};
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template<typename IntType>
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struct integer_digits<IntType, 16>
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: public sprout::detail::integer_digits_impl<IntType, 1, 4>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_INTEGER_INTEGER_DIGITS_HPP
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