Requesting sample code!

Hello,

I am looking into pointers to functions and I am looking at stuff like this:
==================
#include <stdio.h>

int any_function(int(*pfun)(int, int), int x, int y){
return pfun(x, y);
}

int sum(int x, int y){
return x + y;
}

int product(int x, int y){
return x * y;
}

int difference(int x, int y){
return x - y;
}

int main(void){
int a = 10;
int b = 5;
int result = 0;
int (*pf)(int, int);
pf = sum; /* Pointer to sum function */
result = any_function(pf, a, b);
//result = any_function(sum, a, b);
printf("\nresult = %d", result );

result = any_function(product,a, b);
printf("\nresult = %d", result );

printf("\nresult = %d\n", any_function(difference, a, b));
return 0;
}
===========================

But I am looking all over for sample code which embeds the functions or
pointers to function in structures. In other words I am looking for sample
code which would show how to include funtions or pointers to functions as
members of a struct. Very similar ... you know like we do in C++ when we have
methods in our classes. I want to do the same thing with structures. Is this
possible and can someone direct me to some samples or books which illustrate
on how to code this.

I would show an example but I don't even know where to start to code this,
but I know it is possible because I have seen something similar to what I
want to do at:

http://bytes.com/forum/thread583012.html

But I would like a full description of how to implement functions and
pointers to functions as members of a struct which is not posted as a
question but rather as a tutorial or book!

All help and suggestions sincerely appreciated!

P.S. I have not yet looked at amazon.com for any potential books!

--
Best regards
Roberto
.

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