Inheritance and Polymorphism for Drawing

#include <vector>
#include <iostream>

class Drawable {
public:
    virtual void draw() = 0;
};
void Drawable::draw() {
    std::cout << "draw superClass!!" << std::endl;
}

class Ship : public Drawable {
public:
    void virtual draw();
};
void Ship::draw() {
    std::cout << "draw ship!!" << std::endl;
}

class Enemy : public Drawable {
public:
    void virtual draw();
};
void Enemy::draw() {
    std::cout << "enemy ship!!" << std::endl;
}

int main() {
    std::vector<Drawable*> drawables;
    drawables.push_back(new Ship());
    drawables.push_back(new Enemy());
    for (std::vector<Drawable*>::iterator itr = drawables.begin(), end = drawables.end();
        itr != end; ++itr) {
        // use -> syntax for calling when we have a pointer to an object
        (*itr)->draw(); // calls every object in drawables that has draw()
    }
}