  explicit v8_action_t(ActionFeature const& actionFeature)
      : TRI_action_t(),
        _actionFeature(actionFeature),
        _callbacks(),
        _callbacksLock() {}
  explicit v8_action_t(ActionFeature const& actionFeature)
      : TRI_action_t(),
        _actionFeature(actionFeature),
        _callbacks(),
        _callbacksLock() {}