ostream& operator<<(ostream& out, const Employee& e)
{
   out << "Employee " << e.name();
   return out;
}

ostream& operator<<(ostream& out, const Manager& m)
{
   out << "Manager " << e.name();
   return out;
}

Manager man = new Manager(. . .);
cout << *man << "\n"; // Executes Manager function