[Caml-list] Value of the address of a pointer

[Caml-list] Value of the address of a pointer

[André Luiz Moura]

[-- Attachment #1: Type: text/plain, Size: 1030 bytes --]

Hello,
 
Please, it would like to know as to get in OCaml the value of the address of memory of a pointer, as it occurs in the example in C that follows:

Code:
void main()
{
   int my_array[] = {1, 23, 17};
   int *ptr;
   int i;
 
   ptr = &my_array[0];         /* point  to the first element of the array */
   for (i = 0; i < 3; i++) {
      printf("\nvalue of my_array[%d] = %d; ", i, my_array[i]);
      printf("value of ptr + %d = %d\n",i, *(ptr + i)); 
      printf("address of my_array[%d] = %x; ", i, &my_array[i]);
      printf("address of ptr = %x\n", (ptr + i)); 
}
 
Result:
value of my_array[0] = 1; value of ptr + 0 = 1
address of my_array[0] = 12ff80; address of ptr = 12ff80
 
value of my_array[1] = 23; value of ptr + 1 = 23
address of my_array[1] = 12ff84; address of ptr = 12ff84
 
value of my_array[2] = 17; value of ptr + 2 = 17
address of my_array[2] = 12ff88; address of ptr = 12ff88
 
Thanks,
 
André
 





---------------------------------
Yahoo! Mail - O melhor e-mail do Brasil. Abra sua conta agora!

[-- Attachment #2: Type: text/html, Size: 1587 bytes --]

Re: [Caml-list] Value of the address of a pointer

[Nuutti Kotivuori]

Andr wrote:
> Please, it would like to know as to get in OCaml the value of the
> address of memory of a pointer, as it occurs in the example in C
> that follows:

You cannot obtain a pointer to a certain element in an array in
OCaml. And in any case it does not make sense unless you plan on
modifying the element.

If you do plan on modifying it, you will either have to carry both the
array itself and an index to the element inside it separately - or you
will have to have an array of references to values and use it
accordingly then.

I'm a relative OCaml newbie though, so hopefully someone will correct
me if I am wrong.

-- Naked

-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners