From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Subject: Re: GNAT 4.4.5 order of conditional processing?
Date: Tue, 15 Nov 2011 21:54:59 +0100
Date: 2011-11-15T21:54:59+01:00 [thread overview]
Message-ID: <9ig1t4F4uaU1@mid.individual.net> (raw)
In-Reply-To: <fedec493-c81e-4bc9-ba94-399028221f77@k26g2000yqd.googlegroups.com>
On 11-11-15 21:30 , awdorrin wrote:
> Given an IF statement such as the following:
>
> if X = Y and not A and B
>
> How does GNAT handle the processing of the conditional statements?
> Will "X = Y" be processed first, and if false, will the rest be
> skipped?
If you want to be sure that the later conjuncts are evaluated only if
X=Y, use the "and then" form. The following first evaluates "X = Y", and
then evaluates "not A and B" only if X = Y:
if X = Y and then (not A and B) then
do something
end if;
Or, expand also the later "and" so that B is evaluated only if X = Y and
A is false:
if X = Y and then (not A) and then B then
do something
end if;
--
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
. @ .
next prev parent reply other threads:[~2011-11-15 20:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-15 20:30 GNAT 4.4.5 order of conditional processing? awdorrin
2011-11-15 20:54 ` Niklas Holsti [this message]
2011-11-15 21:07 ` awdorrin
2011-11-15 21:23 ` Vinzent Hoefler
2011-11-15 21:49 ` awdorrin
2011-11-16 21:31 ` Gautier write-only
2011-11-16 22:40 ` Adam Beneschan
2011-11-17 0:00 ` Adam Beneschan
2011-11-15 23:08 ` Jeffrey Carter
2011-11-16 1:18 ` Adam Beneschan
2011-11-16 5:33 ` tmoran
2011-11-16 17:52 ` awdorrin
2011-11-16 20:01 ` Simon Wright
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox