template <typename TT>
class Base
{
public:
	Base(const int &rhs) : ss(rhs) { }
	Base(const TT &rhs) : ss(rhs.ss) { }
protected:
	int ss;
};


class cc : public Base<cc>
{
public:
	using Base<cc>::Base;
};
 

int main()
{
	int f;
	cc c = f; // no suitable constructor exists to convert from "int" to "cc"
}