C ++ Template Syntax

Question

How to fix this syntax error?

struct A { template < typename T > void f () {} }; template < typename C, typename U > struct B { void g () { U::f < C > (); // expected primary-expression before »>« token } }; int main () { B<int,A> b; bg (); } 

Answer 1

U is a dependent type, so you need to indicate that f is a member of the template:

 U::template f<C>(); 

This is still not valid if U is A , although f not a static member of A