inherit_test.cpp

#include <iostream>

class PoweredDevice
{
public:
    PoweredDevice(int power)
    {
		std::cout << "PoweredDevice: " << power << '\n';
    }
    PoweredDevice()
    {
		std::cout << "PoweredDevice: " << "default" << '\n';
    }
};
 
class Scanner: virtual public PoweredDevice // note: PoweredDevice is now a virtual base class
{
public:
    Scanner(int scanner, int power)
        : PoweredDevice{ power } // this line is required to create Scanner objects, but ignored in this case
    {
		std::cout << "Scanner: " << scanner << '\n';
    }
};
 
class Printer: virtual public PoweredDevice // note: PoweredDevice is now a virtual base class
{
public:
    Printer(int printer, int power)
        : PoweredDevice{ power } // this line is required to create Printer objects, but ignored in this case
    {
		std::cout << "Printer: " << printer << '\n';
    }
};
 
class Copier: public Scanner, public Printer
{
public:
    Copier(int scanner, int printer, int power)
        : // PoweredDevice{ power }, // PoweredDevice is constructed here
        Scanner{ scanner, power }, Printer{ printer, power }
    {
    }
};
int main() {
  Copier x(1, 2, 3);
  return 0;
}