function in a struct

[sedawk]

Hi,

What is wrong with this?

#include <stdio.h>

struct X {  // or class X { public:
        static int f();
};

int f(void) {
        static int x = 0;
        x++;
        return x;
}

int main(void) {
        X X1;
        int j;
        for (j = 0; j < 5; j++) {
                printf("value of f(x) is: %d\n", X1::f()); // or X1.f()
        }

        return 0;
}

It can't find X1, "error: `X1' is not a class or namespace". Why?

 

[sedawk]

I missed the function definition. It should be:

int X::f(void) {
        static int x = 0;
        x++;
        return x;
}

And call it by X1.f().

 

[cpjust]

In C++ there's not much wrong with it.
In C, it's completely invalid since C isn't an object oriented language.

 

[sedawk]

Yes, this is intended to be a C++. I don't think I can declare a function in struct in C.

 

[chipperMDW]

Did you mean [tt]X::f()[/tt] instead of [tt]X1::f()[/tt]?

(Also, this is the C forum, so you can see why one might have assumed you were asking about C ;-) )