c++ template syntax

Question

How do I fix this syntax error?

struct A {
  template < typename T >
  void f () {}
};

template < typename C, typename U >
struct B {
  void g () {
         


        

Answer 1

U is a dependent type so you need to specify that f is a template member:

U::template f<C>();

This is still invalid when U is A, though, as f is not a static member of A.