mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
#ifndef SPROUT_MATH_IROUND_HPP
|
|
#define SPROUT_MATH_IROUND_HPP
|
|
|
|
#include <limits>
|
|
#include <type_traits>
|
|
#include <stdexcept>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/math/detail/config.hpp>
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
|
|
# include <sprout/math/round.hpp>
|
|
#else
|
|
# include <sprout/math/equal_to.hpp>
|
|
#endif
|
|
|
|
namespace sprout {
|
|
namespace math {
|
|
namespace detail {
|
|
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
|
|
template<typename To, typename FloatType>
|
|
inline SPROUT_CONSTEXPR To
|
|
iround_impl(FloatType x) {
|
|
return std::numeric_limits<To>::max() < x || std::numeric_limits<To>::min() > x
|
|
? SPROUT_MATH_THROW_LARGE_FLOAT_ROUNDING(std::domain_error("iround: large float rounding."), static_cast<To>(x))
|
|
: static_cast<To>(x)
|
|
;
|
|
}
|
|
template<
|
|
typename To = int,
|
|
typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value && std::is_integral<To>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR To
|
|
iround(FloatType x) {
|
|
return sprout::math::detail::iround_impl<To>(sprout::math::round(x));
|
|
}
|
|
#else
|
|
template<typename To, typename FloatType>
|
|
inline SPROUT_CONSTEXPR To
|
|
iround_impl_positive(FloatType x, To x0) {
|
|
return x - x0 < FloatType(0.5) ? x0
|
|
: x0 + 1
|
|
;
|
|
}
|
|
template<typename To, typename FloatType>
|
|
inline SPROUT_CONSTEXPR To
|
|
iround_impl_nagative(FloatType x, To x0) {
|
|
return x0 - x < FloatType(0.5) ? x0
|
|
: x0 - 1
|
|
;
|
|
}
|
|
template<
|
|
typename To = int,
|
|
typename FloatType,
|
|
typename sprout::enabler_if<std::is_floating_point<FloatType>::value && std::is_integral<To>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR To
|
|
iround(FloatType x) {
|
|
return x == 0 ? To(0)
|
|
: std::numeric_limits<To>::max() < x || std::numeric_limits<To>::min() > x
|
|
? SPROUT_MATH_THROW_LARGE_FLOAT_ROUNDING(std::domain_error("iround: large float irounding."), x)
|
|
: x < 0 ? sprout::math::detail::iround_impl_nagative(x, static_cast<To>(x))
|
|
: sprout::math::detail::iround_impl_positive(x, static_cast<To>(x))
|
|
;
|
|
}
|
|
#endif
|
|
template<
|
|
typename To = int,
|
|
typename IntType,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value && std::is_integral<To>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR To
|
|
iround(IntType x) {
|
|
return sprout::math::detail::iround(static_cast<double>(x));
|
|
}
|
|
} // namespace detail
|
|
|
|
using sprout::math::detail::iround;
|
|
} // namespace math
|
|
|
|
using sprout::math::iround;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_MATH_IROUND_HPP
|