From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,9e87e366cae15081
X-Google-Attributes: gid103376,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news3.google.com!news.germany.com!feeder.news-service.com!feeder1.cambrium.nl!feed.tweaknews.nl!not-for-mail
From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: if Restrict_Func /= null confusion
References: 
 <95f36a62-b94c-4211-896a-300fa98932b7@x41g2000hsb.googlegroups.com>
Date: Sun, 30 Mar 2008 23:36:02 +0200
Message-ID: <877ifj99od.fsf@ludovic-brenta.org>
User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux)
Cancel-Lock: sha1:vGwsIWyOIZn+21rRF4VhAREuxN0=
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Organization: Tele2
X-Trace: 
 DXC=nSf@SFGbfIiVgFdUFoS8Sa6`Y6aWje^YjgcXjYPW_FRdJ^hai9M\[kdP;n=XPSb>QcIXm6f4hTmD`
Xref: g2news1.google.com comp.lang.ada:20654
Date: 2008-03-30T23:36:02+02:00
List-Id: <comp.lang.ada>

ma740988@gmail.com writes:
> I'm not following the conditional logic 'if (Restrict_Func / =
> null)'.  Not understanding the impetus behind the check for null.

If Restrict_Func is null and you try to call the subprogram it
designates, you get a Constraint_Error (ARM 4.9(13)).  If you disable
runtime checks, your program is likely to crash.

-- 
Ludovic Brenta.