Thread: Problem with function pointers

I have this setup:

I have a class, and one of the members is a function pointer. I want to be able to implement various possible versions of the function it points to in the same class the function pointer resides in. However, I get various errors when I try to initialize the function pointer to a function that also is a member of the same class.

I've shown the first part, then the error it generates, then in the second part I try to remedy it by declaring the function pointer to be a member of the Vec class, but it still doesn't work (I show the error codes of visual C++ 6). Of course, I couldn't then put this same function pointer in the baseclass, but it could at least point to a member function (sadly I can't even get this much to work properly).

Code:

#include	<iostream>
using namespace std;

//pFunc is of data type function pointer which returns void, accepts void as formal parameter
typedef	void(*pFunc)(void);

void	SomeFunc()
{
	cout	<<	"This is just some func" << endl;
}

typedef	struct	
{
	Vec()
	{
		x = y = z = w = 0;
		funcPtr	=	0;
	}
	void	VectorFunc()
	{
		cout	<<	"This is the vector func" << endl;
	}
	pFunc	funcPtr;
	float	x;
	float	y;
	float	z;
	float	w;	//complex plane
}Vec,*VectorPTR;

typedef	 void(Vec::*VecFuncPtr)(void);

int	main(void)
{
	Vec a;
	a.funcPtr	=	SomeFunc; //works
	a.funcPtr();
	
	a.funcPtr	=	Vec::VectorFunc;	//error:
	/*
	error C2440: '=' : cannot convert from 'void (__thiscall Vec::*)(void)' to 'void (__cdecl *)(void)'
	*/

	VecFuncPtr b;
	b = Vec::VectorFunc;
	b();	//error:
	/*
		error C2064: term does not evaluate to a function
	*/

	return 0;
}