static functions

[hotpil]

I need make something like following:

double CallF1(double (*fun)(double), double y) {
	return (*fun)(y);
}

class A {
	double a;
public:
	static double f1(double x) {return x*x*a;}
	double calc (double x) {
		return CallF1(&f1, x);
	}
};

int _tmain(int argc, _TCHAR* argv[])
{
	double x = 3;
	A mA;
	
	cout << "x = " << x << endl;
	cout << "CallF1(x) = " << mA.calc(x) << endl;
	return 0;
}

Of course, there are compiler errors because the function CallF1 must have a pointer to the class A. But I don't now how to realise this. Could anybody tell me how to do it?

[EzwRko23]

What are you trying to achieve?
Maybe function objects (functors) are what you need? If so, take a closer look at Boost.

Anyway, I don't recommend this style of programming in C++ - it was not meant to be an object-functional language. Why not make this code purely structural, and then simply pass pointers to functions?

[hotpil]

I can not make this code purely structural because that is a small piece of a big project. I only made a simple example to explain what I need. But you must be right. It is not good style of programming.

[moorecm]

http://www.cplusplus.com/reference/std/functional/mem_fun/