mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
#ifndef SPROUT_DETAIL_INT_HPP
|
|
#define SPROUT_DETAIL_INT_HPP
|
|
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
//
|
|
// int_pow
|
|
//
|
|
template<
|
|
typename IntType, int Base = 10,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR IntType
|
|
int_pow(int exponent) {
|
|
return exponent ? Base * sprout::detail::int_pow<IntType, Base>(exponent - 1)
|
|
: 1
|
|
;
|
|
}
|
|
|
|
//
|
|
// int_digits
|
|
//
|
|
template<int Base = 10, typename IntType>
|
|
inline SPROUT_CONSTEXPR int
|
|
int_digits_impl(IntType val) {
|
|
return val ? 1 + sprout::detail::int_digits_impl<Base>(val / Base)
|
|
: 0
|
|
;
|
|
}
|
|
template<
|
|
int Base = 10, typename IntType,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR int
|
|
int_digits(IntType val) {
|
|
return val ? 1 + sprout::detail::int_digits_impl<Base>(val / Base)
|
|
: 1
|
|
;
|
|
}
|
|
|
|
//
|
|
// int_digit_at
|
|
//
|
|
template<
|
|
int Base = 10, typename IntType,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR int
|
|
int_digit_at(IntType val, int digits) {
|
|
return val < 0 ? -((val / sprout::detail::int_pow<IntType, Base>(digits)) % Base)
|
|
: (val / sprout::detail::int_pow<IntType, Base>(digits)) % Base
|
|
;
|
|
}
|
|
} // namespace detail
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_DETAIL_INT_HPP
|