未声明的标识符自定义类

Question

'Plansza' : undeclared identifier I don't know why i get this error. I have 2 classes called "Plansza" and "GameData", i have included both headers( in Plansza.h included "GameData.h" and it's works, but when I include "Plansza.h" in GameData.h it does not see Plansza class :S

Answer 1

When you include Ah in Bh and ALSO the other way around, you setup a circular dependence . If you had include guards, one of them gets lost and such errors occur.

What you want to do is try hard to include .h files in the .cpp files as far as possible, and if this is not possible, reduce the 2 way dependence into a 1 way dependence.

Try as often as possible to use forward declarations in the .h files, as long as you are using only pointers to the class, this will suffice.

class Plansza;

instead of

#include "Plansza.h"

Edit: Thanks user1701595 for a very good reference - Organizing Code Files in C and C++

Answer 2

如果任何人发现了这个问题，并且不具有周期性包括，我设法通过命名枚举情况下，同样的事情为我的类名来得到这个确切的同样的错误。