Method cbrt

include/half/half.hpp:1435–1445

Cubic root implementation. \param arg function argument \return function value stored in single-preicision

			/// \param arg function argument
			/// \return function value stored in single-preicision
			static expr cbrt(float arg)
			{
			#if HALF_ENABLE_CPP11_CMATH
				return expr(std::cbrt(arg));
			#else
				if(builtin_isnan(arg) || builtin_isinf(arg))
					return expr(arg);
				return expr(builtin_signbit(arg) ? -static_cast<float>(std::pow(-static_cast<double>(arg), 1.0/3.0)) : 
					static_cast<float>(std::pow(static_cast<double>(arg), 1.0/3.0)));
			#endif
			}

			/// Hypotenuse implementation.
			/// \param x first argument