gistfile1.cpp

struct foo {
  virtual int bar() = 0;
  virtual int baz() = 0;
};

struct qux: public virtual foo {
  int bar() {
    return baz();
  }
};

struct woof: public virtual foo {
  int baz() {
    return 66;
  }
};

template<class A, class B>
struct garply: public A, public B {};

int main() {
  foo* obj = new garply<qux, woof>();
  return obj->bar();
}