Whats the problem with this code??

[nuzzle]

Thank you very much nuzzle,I didnt notice that.

Well I first told you how to correct the problem and then I told the others why their suggestions were wrong.

Anyway it's usually better to organize code according to the traditional .h and .cpp system. But I also sometimes do as you did, putting everything on one file for ease of testing.

In both cases it's important to know whether a forward declaration is enough or if the full definition must be known. It determines the order of things.