callback issue<mingw compiler error : expected unqualified-id before '=' token>

[tzadik]

hey,
i just wanted to find the size of an overloaded function and got trapped in callback land...

#include<iostream>

using namespace std;
void f(int,int,double);
void f(int,int);

int main(void) {
	void (*p)(int,int,double);
	p = f;
	cout << sizeof(p) << endl;
}
void f(int i,int j, double k){
	cout << "test0" << endl;
}

i can't see what it's asking for and google isn't helping... thanks in advance
n