Sprout/sprout/math/float2_significand.hpp
2013-04-26 00:25:35 +09:00

45 lines
1.5 KiB
C++

#ifndef SPROUT_MATH_FLOAT2_SIGNIFICAND_HPP
#define SPROUT_MATH_FLOAT2_SIGNIFICAND_HPP
#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/float2_exponent.hpp>
#include <sprout/type_traits/enabler_if.hpp>
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
float2_significand(FloatType x) {
return x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
: x == -std::numeric_limits<FloatType>::infinity() ? -std::numeric_limits<FloatType>::infinity()
: sprout::math::isnan(x) ? std::numeric_limits<FloatType>::quiet_NaN()
: x == 0 ? x
: x / sprout::detail::pow_n(FloatType(2), sprout::float2_exponent(x))
;
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR double
float2_significand(IntType x) {
return sprout::math::detail::float_significand(static_cast<double>(x));
}
} // namespace detail
using sprout::math::detail::float2_significand;
} // namespace math
using sprout::math::float2_significand;
} // namespace sprout
#endif // #ifndef SPROUT_MATH_FLOAT2_SIGNIFICAND_HPP