Re: More C

[dvdeug@x8b4e53cd.dhcp.okstate.edu (David Starner)]

On Fri, 28 Jan 2000 09:36:15 +0100, Pascal Obry <p.obry@der.edf.fr> wrote:
>David,
>
>The answer to your question was in the message you quoted!
>
>To know the number of colors use : Palette.Colors'Length (.all is
>not required here I think).
>
>You can also iterate through the table using:
>
>   for K in Palette.Colors'Range loop
>      ...
>   end loop;
>
>Did I missed something ?

We have a similar structure
struct bob {
   char num_chars_in_b;
   char *b; /* array */
};

In memory (assuming 8 bit pointers) we have

num_chars_in_b
|  pointer    array
|  |          |
03 20 ......  01 10 10 23 58 20 48 . . .

The only place in that memory where it tells you the length of the
array is num_chars_in_b. No matter how you translate that structure
into Ada, Ada can't give you the length of the array independent of
num_chars_in_b, because it doesn't have the information. Or so
I understand it.

-- 
David Starner - dstarner98@aasaa.ofe.org
If you wish to strive for peace of soul then believe; 
if you wish to be a devotee of truth, then inquire.
   -- Friedrich Nietzsche