virtual function = 0;

[hjtuhh2009]

waht is this means?
for example:

 class CFahrstil
 {
    public:
    virtual void fahren() = 0;
 };

waht is the advantage?

[Zhuge]

It's called a pure virtual function.

http://www.cplusplus.com/doc/tutorial/polymorphism/#abstract

[hjtuhh2009]

Thanks!