Inheritance

[AdamDH]

I have a class "Car" and a subclass "LuxuryCar" derived from "Car". I also have a class "Radio" and a subclass "SatelliteRadio" derived from "Radio".

I would like the Car to maintain a reference to a Radio. And I would like a LuxuryCar to maintain a reference to a SatelliteRadio.

When instantiating a LuxuryCar object, it creates a reference to a SatelliteRadio. SatelliteRadio has available all the methods of Radio and a method unique to SatelliteRadio. But since LuxuryCar is a subclass of Car, it by default has a reference to a Radio (inherited from the Car class) that I don't really need. And the constructor of the base class Car instantiates a Radio I don't need (I only want a SatelliteRadio). I do need the methods of Car.

I could instantiate the Radio and SatelliteRadios outside of the Car and LuxuryCar classes. But I would still have a reference to Radio in LuxuryCar that I don't really want.

My gut tells me this is not correct and there is a better way to design this. I would like to maintian the inheritence relationship between the cars and the radios. And I want to be able to instantiate both a Car and LuxuryCar if I want.

Any help or thoughts would be appreciated.

Thanks,
Adam







class Car
{
public:
Car();
virtual ~Car();
virtual Start();
provate:
Radio* theRadio;
};

Car::Car()
{
theRadio = new Radio();
}

Car::Start()
{
cout << "Starting Car" << endl;
theRadio->TurnOn();
}

class LuxuryCar : public Car
{
public:
LuxuryCar();
virtual ~LuxuryCar();
Start();
private:
SatelliteRadio* theSatelliteRadio;
};

LuxuryCar::LuxuryCar()
{
theSatelliteRadio = new SatelliteRadio();
}

LuxuryCar::Start()
{
cout << "Starting Luxury Car" << endl;

theSatelliteRadio->TurnOn();
TheSatelliteRadio->FindSatellite();
}

class Radio
{
public:
Radio();
virtual ~Radio();
TurnOn();
};

Radio::radio()
{
}

Radio::TurnOn()
{
cout << "Radio Turned On" << endl;
}

class SatelliteRadio : public Radio
{
public:
SatelliteRadio();
virtual ~Satelliteradio();
FindSatellite();
};

SatelliteRadio::SatelliteRadio()
{
}

SatelliteRadio::FindSatellite()
{
cout << "Searching for Satellite" << endl;
}




void main()
{
Car* cars[2];

cars[0] = new Car();
cars[1] = new LuxuryCar();

for (int x=0l x<2; x++)
{
cout << "Car: " << x << endl;
cars[x]->Start();
}
}