Function Pointers in Structs and Classes?

Is it possible to have function pointers in structs and classes? Here is the structure of the code I am trying to write:

Code:

---

struct function_pointer
{
        int id;
        int *func_1(int,...);
};

int func_2(int argument,...);
{
    va_list arguments;
    va_start(arguments,argument);
    for (int i=0;i<argument;i++)
    {
          cout << va_arg(arguments,int);
    }
    va_end(arguments);
}

int main()
{
    function_pointer x;
    x.id = 10;
    func_2(2,4,5);
    x.func_1 = &func_2; //error line
    x.func_1(2,2,5);
    cin.get();
}

---

There is this error: invalid use of member (did you forget the `&' ?)
I've never seen it before now. Suggestions?

First, you have a semicolon after your arguements in func_2 that has to go. Second, you don't have a function pointer in that struct you have a function that returns a pointer to an int. Why you have it returning an int, I don't know, you aren't returning anything in the function, anyway.

Code:

---

// This is a function pointer
void (*func_1)(int,...);
};

void func_2(int argument,...)
{

---

> int *func_1(int,...);
Would be
int (*func_1)(int,...);

> x.func_1 = &func_2;
x.func_1 = func_2;

Thanks very much! That was just a dumbed-down example of what I had. Ready for the next one?

Can I have a function like so:

Code:

---

void arg_func(...)

---

Where I use the va_ functions to dissect the argument list? The problem I am having is that va_start takes two arguments, and the second one must be the name of the first variable... I don't have one! Is there another choice of function?

> Where I use the va_ functions to dissect the argument list?
You can't, va_args needs at least one fixed argument.

And there is no option, other than va_arg?

On an entirely different note, can I create argument lists as variables and then pass them to a function, ie:

Code:

---

void function(int a, int b){define function};
_arglisttype arg_list x;
// Add two ints to x
function(x);

---

Or, even:

Code:

---

void function(_arglisttype){define function};
_arglisttype arg_list x;
// Add two ints to x
function(x);

---

Once you have an arglist, you can write your own functions like vsprintf()

Class function pointers are much different than C function pointers. I recommend googling it which will give you a host of good sites to browse on the topic.