Question

I have simple problem:

class Weapon{
public:
    int dmg;
    float speed;
    int rate;
};

class Uzi : public Weapon{
public:
    Uzi();
    void Shot(float angle);
};

Class Pistol : public Weapon{
public:
    Pistol();
    void Shot(float angle);
};

Later in code when I reserve for example:

Weapon wep;
wep = Uzi;
wep.Shot(15); 

It doesn’t work:
undefined reference to `Weapon::Shot(float)’

Can I reserve different type of ‘wep’ variable?
I think no because weapons are changing(pistol/uzi/…).

Thanks in advance!

Answer 1

Weapon wep;
wep = Uzi;

This is slicing. Uzi is-a Weapon, but not the other way around. You can use pointers for this:

Weapon* wep = new Uzi();

Also, you get the error because there is no Shot() method in the Weapon() class.

You might want to declare it virtual and also make it abstract (optional). You make it virtual to allow polymorphism.

That way:

Weapon* wep = new Uzi();
wep->Shot();

will call Shot() in the Uzi class, although it’s called on a Weapon pointer.

The following should work:

class Weapon{
public:
    int dmg;
    float speed;
    int rate;
    virtual void Shot(float angle) {}; //move implementation to cpp file
};