C++ static
Sekojošais C++ kods ģenerē sekojošas linkera kļūdas. Cik noprotu, init() neredz paša klases statiskos mainīgos. Kāpēc?

Form.obj : error LNK2001: unresolved external symbol "protected: static struct tagWNDCLASSA Form::wndClass" (?wndClass@Form@@1UtagWNDCLASSA@@A)
Form.obj : error LNK2001: unresolved external symbol "protected: static struct HINSTANCE__ * Form::hInst" (?hInst@Form@@1PAUHINSTANCE__@@A)
Form.obj : error LNK2001: unresolved external symbol "protected: static int Form::cmdShow" (?cmdShow@Form@@1HA)
Form.obj : error LNK2001: unresolved external symbol "protected: static char * Form::cmdParam" (?cmdParam@Form@@1PADA)
Form.obj : error LNK2001: unresolved external symbol "protected: static struct HINSTANCE__ * Form::hPrevInst" (?hPrevInst@Form@@1PAUHINSTANCE__@@A)

/* Form.h */
class Form
{
public:
	static void init(char* name, HINSTANCE hInst, HINSTANCE hPrevInst, char* cmdParam, int cmdShow);
	Form();
	virtual ~Form();
	void show();
protected:
	static LRESULT CALLBACK windowsProcedure(HWND hwnd, uint message, WPARAM wParam, LPARAM lParam);
	static WNDCLASS wndClass;
	static HINSTANCE hInst;
	static HINSTANCE hPrevInst;
	static char* cmdParam;
	static int cmdShow;
	HWND hwnd;
};

/* Form.cpp */
void Form::init(char* name, HINSTANCE hInst, HINSTANCE hPrevInst, char* cmdParam, int cmdShow)
{
	Form::hInst = hInst;
	Form::hPrevInst = hPrevInst;
	Form::cmdParam = cmdParam;
	Form::cmdShow = cmdShow;
	wndClass.style = 0;
	wndClass.lpfnWndProc = windowsProcedure;
	wndClass.cbClsExtra = 0;
	wndClass.cbWndExtra = 0;
	wndClass.hInstance = hInst;
	wndClass.hIcon = 0;
	wndClass.hCursor = LoadCursor(0, IDC_ARROW);
	wndClass.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
	wndClass.lpszMenuName = 0;
	wndClass.lpszClassName = name;
	RegisterClass(&wndClass);
}