mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
#ifndef SPROUT_MATH_FLOAT2_SIG_EXP_HPP
|
|
#define SPROUT_MATH_FLOAT2_SIG_EXP_HPP
|
|
|
|
#include <climits>
|
|
#include <limits>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/detail/pow.hpp>
|
|
#include <sprout/math/detail/config.hpp>
|
|
#include <sprout/math/isnan.hpp>
|
|
#include <sprout/math/ilogb2.hpp>
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
#include <sprout/utility/pair/pair.hpp>
|
|
|
|
namespace sprout {
|
|
namespace math {
|
|
namespace detail {
|
|
template<typename T>
|
|
inline SPROUT_CONSTEXPR sprout::pair<T, int>
|
|
float2_sig_exp_impl(T x, int exp) {
|
|
typedef sprout::pair<T, int> type;
|
|
return type(x / sprout::detail::pow_n(T(2), exp), exp);
|
|
}
|
|
|
|
template<
|
|
typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR sprout::pair<FloatType, int>
|
|
float2_sig_exp(FloatType x) {
|
|
typedef sprout::pair<FloatType, int> type;
|
|
return sprout::math::isnan(x) ? type(x, 0)
|
|
: x == std::numeric_limits<FloatType>::infinity() ? type(std::numeric_limits<FloatType>::infinity(), 0)
|
|
: x == -std::numeric_limits<FloatType>::infinity() ? type(-std::numeric_limits<FloatType>::infinity(), 0)
|
|
: x == 0 ? type(x, 0)
|
|
: sprout::math::detail::float2_sig_exp_impl(x, sprout::math::ilogb2(x) + 1)
|
|
;
|
|
}
|
|
template<
|
|
typename IntType,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR sprout::pair<double, int>
|
|
float2_sig_exp(IntType x) {
|
|
return sprout::math::detail::float2_sig_exp(static_cast<double>(x));
|
|
}
|
|
} // namespace detail
|
|
|
|
using sprout::math::detail::float2_sig_exp;
|
|
} // namespace math
|
|
|
|
using sprout::math::float2_sig_exp;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_MATH_FLOAT2_SIG_EXP_HPP
|