Method handle

benchmark/complex/switch.cpp:119–130

  void action() {}

  void handle(const e1&) {
    switch (state) {
      default:
        break;
      case State::S1:
        if (guard()) {
          action();
          state = State::S2;
        }
        break;
    }
  }

  void handle(const e2&) {
    switch (state) {