Private Inheritance

#include <iostream>
using namespace std;

class Device {
public:
    void showType() {
        cout << "Generic Device\n";
    }
};

class Actuator : private Device {
public:
    void showActuator() {
        showType();
        cout << "Actuator Device\n";
    }
};

int main() {
    Actuator a;
    a.showActuator();  // should print both lines
    return 0;
}