Protected Inheritance

#include <iostream>
using namespace std;

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

class Sensor: protected Device {
public:
    void showSensor(void) {
        showType();
        printf("Sensor Device\n");
    }
};

int main() {
    Sensor s;
    s.showSensor();  // should print both lines
    return 0;
}