inline sums()
     : sum_a2(calc_type())
     , sum_x(calc_type())
     , sum_y(calc_type())
 {
     typedef calc_type ct;
     //std::cout << "-> calctype: " << typeid(ct).name()
     //    << " size: " << sizeof(ct)
     //    << " init: " << sum_a2
     //    << std::endl;
 }
/** calculate the sensor value - first step to get the type*/
void RegionSensor::calc(QString str) {
	sensor_name=str;
	int label = (int) ((*node_)["id"])->toInt();
	calc_type(label);	
}