#include <iostream>
using namespace std;

class Device {
    public:
        void turn_on() {
            cout << "Device is on." << endl;
        }
};

class Computer: public Device {};

class Monitor: public Device {};

class Laptop: public Computer, public Monitor {
    /*
    public:
        void turn_on() {
            cout << "Laptop is on." << endl;
        }
    // uncommenting this function will resolve diamond problem
    */
};

int main() {
    Laptop my_laptop;

    // my_laptop.turn_on();
    // will produce compile time error
    // if Laptop.turn_on function is commented out

    // calling method of specific superclass
    my_laptop.Monitor::turn_on();

    // treating Laptop instance as Monitor instance via static cast
    static_cast<Monitor&>( my_laptop ).turn_on();

    return 0;
}