Virtual Public Inheritance

#include <iostream>
using namespace std;

class Device {
public:
    void show(){
        cout << "Generic Device" << endl;
    }
};

class Sensor : virtual public Device {
    // no extra code needed
};

class Actuator : virtual public Device {
    // no extra code needed
};

class SmartDevice: virtual public Sensor, virtual public Device{
    public:
        void identify(){
            cout << "Smart Device" << endl;
        }
};
int main() {
    SmartDevice sd;
    sd.show();      // from Device
    sd.identify();  // from SmartDevice
    return 0;
}