C++ Trouble finding the right class hierarchy implementation

[mr5zz]

Please see first the code:

    class BM_FONT_CALL BMfont
    {
    public:

	BMfont();
    ~BMfont();

	bool Load(const std::string& fontName);
	void Print(float x, float y);

	class BM_FONT_CALL BMstring : public std::string
	{

    public:

        BMstring() { }
	    BMstring(const char* str);

	    BMstring& operator=(const char* str);
	    BMstring operator+=(const char* str);

    private:

        void Compile();

	};
	
    public:

    BMstring text;
    float scale;
    _uint32 tabSize;
    _uint32 textureSheet;
	_uint32 backTexture;
	_uint32 frontTexture;
	bool enableMasking;

	_uint32 base;
	_uint32 lineHeight;
	_uint32 pages;
	_uint32 scaleW, scaleH;
	_uint32 kerninfo_count;

	BMkerninfo	*kerninfo;
	BMchar		chars[MAX_CHAR];

    private:

    std::string _fontName;

    };

How can I do `BMstring` have an access to `BMfont`'s members, as if `BMstring` will not inherit `BMfont`'s members? For example, if I do this:

    BMfont::BMstring text;
    text.scale //I don't want this

What I want to do here is, I want the `BMstring::Comp ile()` to have an access to `BMfont` with no any instance of `BMfont` inside `BMstring`.

-----

Or what if I do this:

    class BM_FONT_CALL BMstring : public std::string
    {

        std::function<void (void)> func;

    public:

        BMstring() { func = BMfont::Compile(); }

    }

By making the `Compile()` member of `BMfont`.
But this won't compile. How can I achieve this?

[Oralloy]

mr5zz,

How can I do `BMstring` have an access to `BMfont`'s members, as if `BMstring` will not inherit `BMfont`'s members?

Have you tried having BMfont declare BMstring as a friend?

friend class BMstring;

Or, have i missed the point?

Cheers,
Oralloy

[Banfa]

BMString can not have access to BMFont members because just because an instance of BMString exists does not mean that an instance of BMFont exists.

Anyone can declare a variable of type BMString.

Somehow you need to enable BMString have visibility of the BMFont you wish it to using while it is compiling so for example perhaps BMString::compi le() should be declared BMString::compi le(const BMFont& font).

Whatever method you choose you will need to get a BMFont object or reference in scope inside the BMString object.

Also it is very poor practice to have BMFonts data members public.