mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
|
#ifndef SPROUT_DETAIL_INT_HPP
|
||
|
|
#define SPROUT_DETAIL_INT_HPP
|
||
|
|
|
||
|
|
#include <type_traits>
|
||
|
|
#include <sprout/config.hpp>
|
||
|
|
#include <sprout/utility/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
|