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,c370342fe303517b
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news2.google.com!news3.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newsfeed00.sul.t-online.de!t-online.de!130.59.10.21.MISMATCH!kanaga.switch.ch!news-zh.switch.ch!switch.ch!cernne03.cern.ch!not-for-mail
From: Maciej Sobczak <no.spam@no.spam.com>
Newsgroups: comp.lang.ada
Subject: Re: C Interface example
Date: Tue, 06 Feb 2007 09:20:52 +0100
Organization: CERN News
Message-ID: <eq9dp5$c88$1@cernne03.cern.ch>
References: <1170516037.435847.326440@p10g2000cwp.googlegroups.com>
 <uC6xh.1170912$084.450076@attbi_s22> <eq6rgq$9t5$1@cernne03.cern.ch>
 <BsKxh.1174338$084.631125@attbi_s22>
 <db6dnU6LHvqGQ1rYnZ2dnUVZ_u6rnZ2d@megapath.net>
NNTP-Posting-Host: abpc10883.cern.ch
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Trace: cernne03.cern.ch 1170750053 12552 137.138.37.241 (6 Feb 2007 08:20:53
 GMT)
X-Complaints-To: news@@cern.ch
NNTP-Posting-Date: Tue, 6 Feb 2007 08:20:53 +0000 (UTC)
User-Agent: Thunderbird 1.5.0.9 (X11/20061220)
In-Reply-To: <db6dnU6LHvqGQ1rYnZ2dnUVZ_u6rnZ2d@megapath.net>
Xref: g2news2.google.com comp.lang.ada:9009
Date: 2007-02-06T09:20:52+01:00
List-Id: <comp.lang.ada>

Randy Brukardt wrote:

> Anyway, the point is that if you just drop the result on the floor, the Ada
> compiler might be allowed to omit the call, too. So it is always best to use
> the result somehow. In this case, test it for null and do something
> explicit:
> 
>     if Result = null then
>         raise Internal_Error;
>     end if;
> 
> where Internal_Error is an appropriately defined exception.

What about:

pragma Assert(Result /= null);

It's shorter, looks more "serious" and uses optimistic positive logic 
instead of a negative one ("I'm alive!" instead of "Let's check whether 
I'm dead").

The only problem is that there is no choice of exception.

-- 
Maciej Sobczak : http://www.msobczak.com/
Programming    : http://www.msobczak.com/prog/