Method acosh

extern/half/include/half.hpp:1546–1553

Hyperbolic area cosine 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 acosh(float arg)
			{
			#if HALF_ENABLE_CPP11_CMATH
				return expr(std::acosh(arg));
			#else
				return expr((arg<-1.0f) ? std::numeric_limits<float>::quiet_NaN() : static_cast<float>(std::log(arg+std::sqrt(arg*arg-1.0))));
			#endif
			}

			/// Hyperbolic area tangent implementation.
			/// \param arg function argument