class a class B public: public: A(int y:x(y) B(int y): x(y) int fno return x*x*x; int fno return x*x*x;) private: private. int xs template <class T>: class B public: B( y: Xy Tfno return x**x; pl rivate. Xclass A { public: A(int y):x(y) { } int fn() {return x*x*x;} }; private: int x; class B { public: B(int y):x(y) { } int fn() {return x*x*x;} }; private: int x; class B { public: B(T y):x(y) { } T fn() {return x*x*x;} }; private: T x; template <class T>；