There's really not much to either topic.
The one hard part about pointers to functions
is to remember to put parentesis around the
* and the function name.
void (*funcpoint)();
void func() { printf("Hello\n"); }
funcpoint = func; /* Notice no parenthesis! */
(*funcpoint)(); /* "Hello\n" is displayed */
Function pointers must point to static functions.
Any function which is standalone (not part of a
class; freely defined with global scope) is static.
(Others on the list verify this, please.) Member
functions (C++) are only static if you give the
static keyword. You cannot mix static with the
virtual keyword. (Grrr...)
void pointers (vastly different than the
case of above. Above was a pointer to a function
with void parameters and void return type. A
void pointer can point to *anything*, but you must
type cast it if it is on the right side of an equals sign.
void *pointertoanything;
char mychar;
int myint;
char *mycharptr;
int *myintptr;
pointertoanything = &mychar;
mycharptr = (char*)pointertoanything;
pointertoanything = &myint;
myintptr = (int*)pointertoanything;
I'm sorry if I confused you more than I helped. :-(
I don't think I've ever found a book which gave
more than 1/2 - 1 page of info on either of these
topics. Not that they're easy, just that there's not
much to them.
~Patrick
> ----------
> From: [EMAIL PROTECTED]
>
>
> Hey all..is there a definitive book to learn how to use pointers to
> functions and void* variable types? I'd also like to tie it into
> reusability and OOP if at all possible (no I can't use C++ or any standard
> OO language)
>
> Thanks,
> Chris
>
>
