mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
#ifndef SPROUT_MATH_TRUNC_HPP
|
|
#define SPROUT_MATH_TRUNC_HPP
|
|
|
|
#include <cstdint>
|
|
#include <limits>
|
|
#include <type_traits>
|
|
#include <stdexcept>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/math/detail/config.hpp>
|
|
#include <sprout/math/isnan.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
|
|
trunc(FloatType x) {
|
|
return sprout::math::isnan(x) ? x
|
|
: x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
|
|
: x == -std::numeric_limits<FloatType>::infinity() ? -std::numeric_limits<FloatType>::infinity()
|
|
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
|
|
: std::trunc(x)
|
|
#else
|
|
: x == 0 ? x
|
|
: std::numeric_limits<std::uintmax_t>::max() < x || std::numeric_limits<std::uintmax_t>::max() < -x
|
|
? SPROUT_MATH_THROW_LARGE_FLOAT_ROUNDING(std::runtime_error("trunc: large float rounding."), x)
|
|
: x < 0 ? -static_cast<FloatType>(static_cast<std::uintmax_t>(-x))
|
|
: static_cast<FloatType>(static_cast<std::uintmax_t>(x))
|
|
#endif
|
|
;
|
|
}
|
|
template<
|
|
typename IntType,
|
|
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
|
|
>
|
|
inline SPROUT_CONSTEXPR double
|
|
trunc(IntType x) {
|
|
return sprout::math::detail::trunc(static_cast<double>(x));
|
|
}
|
|
} // namespace detail
|
|
|
|
using NS_SPROUT_MATH_DETAIL::trunc;
|
|
} // namespace math
|
|
|
|
using sprout::math::trunc;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_MATH_TRUNC_HPP
|