Listing 1

(a)

// new style
handle_event on_change() { // ...
  return event_ex<m_change::ev::clicked>().HANDLED_BY(&me::on_change);
}
handle_event on_food_change() { // ...
  return event_ex<m_food::ev::sel_change>().HANDLED_BY(&me::on_food_change);
}
handle_event on_name_change() { // ...
  return event_ex<m_name::ev::change>().HANDLED_BY(&me::on_name_change);
}
handle_event on_size() { // ...
  return event_ex<wm::size>().HANDLED_BY(&me::on_size);
}

(b)

// old style
handle_event on_change() { // ...
  return command<ID_CHANGE,BN_CLICKED>().HANDLED_BY(&me::on_change);
}
handle_event on_food_change() { // ...
  return command<IDC_FOOD,CBN_SELCHANGE>().HANDLED_BY(&me::on_food_change);
}
handle_event on_name_change() { // ...
  return command<IDC_NAME,EN_CHANGE>().HANDLED_BY(&me::on_name_change);
}
handle_event on_size() { // ...
  return event<WM_SIZE>().HANDLED_BY(&me::on_size);
}