Method log2

extern/half/include/half.hpp:1431–1438

Binary logarithm 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 log2(float arg)
			{
			#if HALF_ENABLE_CPP11_CMATH
				return expr(std::log2(arg));
			#else
				return expr(static_cast<float>(std::log(static_cast<double>(arg))*1.4426950408889634073599246810019));
			#endif
			}

			/// Square root implementation.
			/// \param arg function argument