Re: Address arithmetic alternatives

[Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>]

On 06/09/2011 03:40 AM, milouz wrote:
>
>> More correctly, you *think* you need to play with address arithmetic. You may be
>> right, but address arithmetic is needed extremely rarely in Ada. Ada has
>> alternatives to most address arithmetic in C.
>
> You're probably right. But what are those alternatives ?

That depends on what you're trying to do. Probably the most common is (I 
apologize if my C is wrong)

p = a;
while (*p++) {
    /* do something with *p */
}

(which is wrong any since "a" may not contain a zero, and you go off accessing 
memory you shouldn't. This kind of thing is why C coders are creating yet more 
buffer-overflow vulnerabilities even as I type)

In Ada, one uses indexing:

for I in A'range loop
    -- Do something with A (I).
end loop;

-- 
Jeff Carter
"I was hobbling along, minding my own business, all of a
sudden, up he comes, cures me! One minute I'm a leper with
a trade, next minute my livelihood's gone! Not so much as a
'by your leave!' You're cured, mate. Bloody do-gooder!"
Monty Python's Life of Brian
76