mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#ifndef SPROUT_MATH_LOG2HPP
|
|
#define SPROUT_MATH_LOG2HPP
|
|
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/math/log.hpp>
|
|
#include <sprout/math/constants.hpp>
|
|
#include <sprout/utility/enabler_if.hpp>
|
|
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
|
|
# include <cmath>
|
|
#endif
|
|
|
|
namespace sprout {
|
|
namespace math {
|
|
namespace detail {
|
|
template<
|
|
typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR FloatType
|
|
log2(FloatType x) {
|
|
return sprout::math::log(x) / sprout::math::ln_two<FloatType>();
|
|
}
|
|
|
|
template<
|
|
typename IntType,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR double
|
|
log2(IntType x) {
|
|
return sprout::math::detail::log2(static_cast<double>(x));
|
|
}
|
|
} // namespace detail
|
|
|
|
# if SPROUT_USE_BUILTIN_CMATH_FUNCTION
|
|
using std::log2;
|
|
# else
|
|
using sprout::math::detail::log2;
|
|
# endif
|
|
} // namespace math
|
|
|
|
using sprout::math::log2;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_MATH_LOG2HPP
|