Question

I would like to ask, how can I define class inside another one. In the code below. I try to define it in the way #define “CCompField.h” ,but it doesn’t work. :(.
I think that it is very common programming problem, probably it was 100000 times solved on the internet, but I don’t know how to find it. Thanks for help.

#ifndef CNEWGAME_H
#define CNEWGAME_H

class CNewGame{
    public:
               CNewGame();
              ~CNewGame();

        void  BeginnerGame();
        void  IntermediateGame();
        void  AdviceGame();
        void  HowToPlay();
        void  NetGame( int mode );


        int MoveInMenu();

    protected:
        void  Intro();
        void  Animation ();
        void  Menu(int);
         int  MoveInNetMenu();
        void  NetMenu(int);

        void  HeadOfGame();
template <class T> void BodyOfGame(CCompField & b, T & a);
        void  FooterOfGame();
};

#endif

It makes following errors.

In file included from src/CNewGame.cpp:12:0:
src/CNewGame.h:37:36: error: ‘CCompField’ was not declared in this scope
src/CNewGame.h:37:45: error: ‘b’ was not declared in this scope
src/CNewGame.h:37:50: error: expected primary-expression before ‘&’ token
src/CNewGame.h:37:52: error: ‘a’ was not declared in this scope
src/CNewGame.h:37:53: error: variable or field ‘BodyOfGame’ declared void

Answer 1

Instead of #define "CCompField.h" you need to include it:

#include "CCompField.h"

You also have an extra pair of

#ifndef CNEWGAME_H
#define CNEWGAME_H  

but only one closing #endif. You don’t need the second pair of #ifndef/#define