template <typename T>
struct dummy {
	T DoIt() const { return T(); }
};

template <typename T>
struct dummy<std::complex<T>> {
	using PT = std::complex<T>;
	PT DoIt() const { return PT(0, 0); }
};

struct Boo {
	Boo() {
		double val    = GetAZero<double>();
		std::complex<float>  valc1 = GetAZero<std::complex<float>>();
		std::complex<double>  valc2 = GetAZero<std::complex<double>>();
	}
	
	template <class T>
	T GetAZero() { return dummy<T>().DoIt(); }
};