FuncPointer doesn't work

[trevex]

Hi everybody,
I am in first year at uni and need to do a little c++ app...

The problem is I have a Event Class:

typedef void (*FuncDownPtr)(void);
typedef void (*FuncOverPtr)(int,int);

class Event {
	private:
		FuncDownPtr DownFunc; 
		FuncOverPtr OverFunc;
	public:
		int type;
		int state;
		Event();
		void RegisterDownFunc(FuncDownPtr Func); 
		void RegisterOverFunc(FuncOverPtr Func);
		void CallDownFunc(void);
		void CallOverFunc(int x, int y);
};

and in the related *.cpp

Event::Event() {
	DownFunc = NULL;
	OverFunc = NULL;
	type=0;
	state=0;
}
void Event::RegisterDownFunc(FuncDownPtr Func) {
	DownFunc = Func;
}
void Event::RegisterOverFunc(FuncOverPtr Func) {
	OverFunc = Func;
}
void Event::CallDownFunc(void) {
	if (DownFunc!=NULL)
		DownFunc();
}
void Event::CallOverFunc(int x, int y) {
	if (OverFunc!=NULL)
		OverFunc(x, y);
}

So the problem is the RegisterDoneFunc works very well, for example here an instance of the Button Class which is a child of Event-Class:

Button *bQuit = new Button(69,22,10,"QUIT");
	// set style
	bQuit->SetAttributes(BACKGROUND_BLUE | BACKGROUND_GREEN | BACKGROUND_RED | BACKGROUND_INTENSITY, BACKGROUND_RED | BACKGROUND_INTENSITY,BACKGROUND_GREEN | BACKGROUND_RED | BACKGROUND_INTENSITY);
	// init function and register to button
	void bQuit_clicked(void);
	bQuit->RegisterDownFunc(bQuit_clicked);

But in another Class which is a child of Event-Class, I try to call RegisterOverFunc() in the constructor like that:

RegisterOverFunc(SetFocusCell);

//the SetFocusCell is part of the same class and defined like that:
void SetFocusCell(int x, int y);

So the thing is the compiler throws an error for RegisterOverFunc(SetFocusCell); but why?

The error is:
error C3867: 'Sudoku::SetFocusCell': function call missing argument list; use '&Sudoku::SetFocusCell' to create a pointer to member

I hope you can help me,
thanks,
Niklas

P.S: Sorry about the bad english... hope it's readable

[PanGalactic]

The error is correct, you need to register the function like this:

RegisterOverFunc(&Sudoku::SetFocusCell);

However, that's not really going to work unless SetFocusCell is a static member function.

You probably should read this first:

http://www.parashift.com/c++-faq-lite/pointers-to-members.html

You are getting into an area where Boost Bind becomes extremely useful:

http://www.boost.org/doc/libs/1_46_0/libs/bind/bind.html

[trevex]

Thanks,
helped alot!
It's working now.