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inheritance problem

nullGrind (15)
Hello Guys

im trying to build a class with inheritance. I read a few online tutorials about it but i dont get the point.
I tried to draw a circle with the class sf::Shape but my compiler keeps screaming "undefined reference to `Asteroid::Asteroid()'"

So here is the code:
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#ifndef _ASTEROID_H
#define	_ASTEROID_H
#include <SFML/Graphics.hpp>
#include <SFML/System.hpp>
#include <SFML/Window.hpp>

class Asteroid : public sf::Shape {
private:

public:
    Asteroid(); 
    
    Asteroid(const Asteroid& orig);
    virtual ~Asteroid();


};

#endif	/* _ASTEROID_H */ 

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#include "Asteroid.h"
#include <SFML/Graphics.hpp>
#include <SFML/System.hpp>
#include <SFML/Window.hpp>


double radiAsteroid = 50;

Asteroid::Asteroid() {
    sf::Shape::Circle(400, 400, radiAsteroid, sf::Color(255, 255, 255));

}

Asteroid::Asteroid(const Asteroid& orig) {
    
}

Asteroid::~Asteroid() {
}


main.cpp
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Asteroid asteroidclass;
Game.Draw(asteroidclass);
jsmith (5804)
You aren't linking against Asteroid.cpp.

The implementation of your default constructor looks wrong too.
And an empty copy constructor cannot be good.
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