• Check return type to test type:

for (int i = 0; i < department.size(); i++)
{
   Manager* m = dynamic_cast<Manager*>(department[i]);
      if (m != NULL)
         cout << "Employee " << department[i]->get_name()
            << " is a manager.\n";
   else
      cout << "Employee " << department[i]->get_name()
         << " is not a manager.\n";
}