gistfile1.cpp

#include <iostream>

class A {
  public:
    virtual ~A() { }
    virtual void Foo() {
      std::cout << "Hello from A!" << std::endl;
    }
};

class B : public virtual A {
  public:
    void Foo() override {
      std::cout << "Hello from B!" << std::endl;
    }
};

class C : public virtual A, private virtual B {
};

static void Bar(A &a) {
  a.Foo();
}

int main() {
  C c;
  // c.Foo();
  Bar(c);
  return 0;
}