Question

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error: expected class-name before ‘{’ token

I’ve got one main super-class GameObject and derived class GuiBitMapFont. It always throws expected class-name error. But if I will add forward derivation in GuiBitMapFont class GameObject; it throws invalid use of incomplete type ‘class GameObject’ and forward declaration of ‘class GameObject’.

EDIT
Yes there was #include GuiBitMapFont in GameObject file. But that was my mistake while writing this question. Compiler still throws those two errors.

#ifndef GAMEOBJECT_H
#define GAMEOBJECT_H

#include <string>
#include "Texture.h"

class GameObject {
private:
    int x;
    int y;
    int width;
    int height;
public:
    GameObject();
    GameObject(int x, int y, int width, int height);
    GameObject(const GameObject& orig);
    virtual ~GameObject();

    virtual void draw();
    virtual void update();

    //ignore those, i need to rewrite it....
    void setX(int x);
    void setY(int y);
    void setWidth(int width);
    void setHeight(int height);
    int getX() const;
    int getY() const;
    int getWidth() const;
    int getHeight() const;
};

#endif  /* GAMEOBJECT_H */

and derived

#ifndef GUIBITMAPTEXT_H
#define GUIBITMAPTEXT_H

#include <string>
#include "SDL.h"
#include "GameObject.h"
#include "BMF.h"

class GuiBitMapText : public GameObject { //error: expected class-name before '{' token
private:
    std::string text;
    BMF *font;

    //SDL_Surface *surf;
    SDL_Texture *texture;
public:
    GuiBitMapText(int x, int y, std::string text, BMF *font);
    GuiBitMapText(const GuiBitMapText& orig);
    virtual ~GuiBitMapText();

    virtual void draw();
    virtual void update();
};

#endif  /* GUIBITMAPTEXT_H */

Answer 1

You have a circular include. Remove this line from GameObject.h:

#include "GuiBitMapText.h"

You don’t use this class in GameObject.h, so there is no need for the include to even be there. There are cases where you have to forward-declare classes when dealing with types whose definitions reference each other, but since GameObject does not make any reference to GuiBitMapText, there is no reason you should need to forward-declare in this instance.