Base class Undefined WEIRD problem . Need help

Question

My CGameStateLogo which inherit from CGameState:

CGameState.h

#pragma once
#include "GameMain.h"
#include "MyBitmap.h"

class CGameMain;
class CMyBitmap;

class CGameState
{
public:
    CMyBitmap* pbmCurrent;
    CGameMain* pGM;

    int GameStateID;

    virtual void MessageEnter () = 0;
    virtual void MessageUpdate( int iKey ) = 0;
    virtual void MessagePaint( HDC* pDC ) = 0;

    void StateHandler ( int msg, HDC* pDC, int key ); 

public:
    CGameState(void);
    ~CGameState(void);
};

After creating and finding, problem comes from here : I've created 2 classes: CTest and CGameStateLogo

    #pragma once
#include "GameState.h"
class CTest:CGameState
{
public:
    CTest(void);
    ~CTest(void);
};

#pragma once
#include "GameState.h"
class CGameStateLogo:CGameState // Bug at this line
{
public:
    CGameStateLogo(void);
    ~CGameStateLogo(void);
};

Do VS has problem in naming ?

Thanks for reading this :). Things go WEIRD, I'll update my question later. Sorry for wasting your time .

Answer 1

pGameStates.push_back( (CGameState*)gameLogo );

Since CGameStateLogo inherits publically from CGameState, the cast is unneccesary. Upcasts are implicit. Simply write

pGameStates.push_back( gameLogo );

instead.

---

This does probably not solve your compile troubles, though. As to that, you seem to be mixing up GameState.h and CGameState.h. If that's an actual error in your code, instead of just a copy/paste mistake while writing your question, it could cause this problem.

---

It could also be that there is some circular dependency problem in your headers. You write

#include "GameState.h"

which should define the GameState class, unless the file has already been included once, but the class definition has not yet been read. This could happen for example in this way:

• Some .cpp file includes GameState.h.
• GameState.h includes GameMain.h.
• GameMain.h includes GameStateLogo.h.
• GameStateLogo.h includes GameState.h, but this has already been included, so the include is ignored due to #pragma once.

Generally, such circular dependencies in header files are a thing to avoid.

Answer 2

CGameStateLogo.h is including GameState.h and not CGameState.h. Is it possible you have a file called GameState.h on the include path (and hence you wouldn't get an error about not being able to include GameState.h)?