template12.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

// Testcase for 'this is a type' syntax.
// Build don't link:

struct B {
  typedef int A;
};

template <class T> struct Y {
  void f() {
    typename T::A *d;
  }
};

template class Y<B>;