Class inheritance problems

[Lost User]

Hi! I can't derive my CBaseRenderer class from CD3DBase, here's my code:

#pragma once

class CD3DBase;

class CBaseRenderer : public CD3DBase
{
public:
CBaseRenderer(void);
~CBaseRenderer(void);

public:
void OnLostDevice();
void OnResetDevice();
void OnFrameMove();
void OnRender();
void OnInitVolatileResources();
void OnFreeVolatileResources();
};

and these are the errors: ------ Build started: Project: DXProject, Configuration: Release Win32 ------ Compiling... CBaseRenderer.cpp e:\C++\DXProject\CBaseRenderer.h(7) : error C2504: 'CD3DBase' : base class undefined DXProject.cpp e:\C++\DXProject\CBaseRenderer.h(7) : error C2504: 'CD3DBase' : base class undefined CD3DBase.cpp e:\C++\DXProject\CBaseRenderer.h(7) : error C2504: 'CD3DBase' : base class undefined CApplication.cpp e:\C++\DXProject\CBaseRenderer.h(7) : error C2504: 'CD3DBase' : base class undefined What's wrong with this code? :( regards

[Johnny]

You must include the header for the definition of CD3DBase. If you are deriving from a class then it is not enough just to have a forward reference, you need the full class available.

[Lost User]

Ok thanks, but if I include the header, I get even more errors, since CBaseRenderer and CD3DBase include each other, because CD3DBase needs to create an object of CBaseRenderer

[Johnny]

You could put a forward declaration of CBaseRenderer into CD3DBase.h

[Lost User]

Ok, next errors :-D

#pragma once

/* includes */

class CBaseRenderer;

class CD3DBase
{
/* ... */
private:
CBaseRenderer gRenderer;
};

And here the errors: e:\C++\DXProject\CD3DBase.h(46) : error C2079: 'CD3DBase::gRenderer' uses undefined class 'CBaseRenderer

[David Crow]

You're missing #include "BaseRenderer.h" or you can make gRenderer a pointer.

---

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

[Lost User]

tried both. this eliminated all errors, except that now I get this one again: e:\C++\DXProject\CBaseRenderer.h(5) : error C2504: 'CD3DBase' : base class undefined

#pragma once
#include "CD3DBase.h"

class CBaseRenderer : public CD3DBase
{ ...

but well...since I only need a pointer to an IDirect3DDevice9 from CD3DBase, I might also create a function to pass this one as a parameter and make CBaseRender not to inherit from CD3DBase.

[suiram40]

you have a dependecy loop. "a.h" file includes "b.h" and "b.h" file includes "a.h" when you derive the derivated class has to know the type tou derive from so you need the definition of the type not the declaration of that type.