#include <iostream>
 
template <class T, class Derived>
class A {
  public:
    template <class U>
    void f(U& bar) {
      std::cout << "A's f(U&)\n";
      static_cast<Derived*>(this)->f(bar);
    }
 
    void f(T& foo) {
		std::cout << "A's f(T&)\n";
    }
};
 
 
class B : public A<int, B>
{
  public:
    template <class T>
    void f(T &foo) {
      std::cout << "B's f(T&)\n";
    }
};
 
 
int main() {
  A<int, B>* ptr = new B;
  ptr->f("foo");
  delete ptr;
  return 0;
}
 

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