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#include <iostream>

class Foo {
 public:
  virtual void f() = 0;
};

void Foo::f() {
  std::cout << "Hello Foo::f!\n";
}

class Frob : public Foo {
 public:
  virtual void f() {
    Foo::f();
    std::cout << "Hello Frob::f!\n";
  }
};

int main(int argc, char* argv) {
  Foo* f = new Frob;
  f->f();
}