struct AZero {
	template <typename T>
	operator T() const {return 0;}
	
	template <typename T>
	operator std::complex<T>() const {return std::complex<T>(0, 0);}
};

double val    = AZero();
std::complex<float>  valc1 = AZero();
std::complex<double>  valc2 = AZero();

template <typename T> 	T GetAZero() {return 0;}
template <typename T> std::complex<T>	GetAZero<class std::complex<T>>() {return std::complex<T> (0, 0);}