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https://github.com/bolero-MURAKAMI/Sprout.git
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52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
#ifndef SPROUT_DETAIL_INT_HPP
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#define SPROUT_DETAIL_INT_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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namespace sprout {
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namespace detail {
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//
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// int_pow
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//
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template<typename IntType, int Base = 10, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
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inline SPROUT_CONSTEXPR IntType
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int_pow(int exponent) {
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return exponent ? Base * sprout::detail::int_pow<IntType, Base>(exponent - 1)
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: 1
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;
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}
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//
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// int_digits
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//
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template<int Base = 10, typename IntType>
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inline SPROUT_CONSTEXPR int
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int_digits_impl(IntType val) {
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return val ? 1 + sprout::detail::int_digits_impl<Base>(val / Base)
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: 0
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;
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}
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template<int Base = 10, typename IntType, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
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inline SPROUT_CONSTEXPR int
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int_digits(IntType val) {
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return val ? 1 + sprout::detail::int_digits_impl<Base>(val / Base)
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: 1
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;
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}
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//
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// int_digit_at
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//
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template<int Base = 10, typename IntType, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
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inline SPROUT_CONSTEXPR int
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int_digit_at(IntType val, int digits) {
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return val < 0 ? -((val / sprout::detail::int_pow<IntType, Base>(digits)) % Base)
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: (val / sprout::detail::int_pow<IntType, Base>(digits)) % Base
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;
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}
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_INT_HPP
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