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=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,b78c363353551702
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Received: by 10.68.220.230 with SMTP id pz6mr22762113pbc.3.1340201616237;
        Wed, 20 Jun 2012 07:13:36 -0700 (PDT)
Path: 
 l9ni72599pbj.0!nntp.google.com!news2.google.com!news.glorb.com!feeder.erje.net!news2.arglkargh.de!news.mixmin.net!aioe.org!.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: about the new Ada 2012 pre/post conditions
Date: Wed, 20 Jun 2012 16:13:36 +0200
Organization: cbb software GmbH
Message-ID: <1hgo6aks03zy.by4pq4xbjsgf$.dlg@40tude.net>
References: <jrsjr7$uuo$1@speranza.aioe.org>
Reply-To: mailbox@dmitry-kazakov.de
NNTP-Posting-Host: FbOMkhMtVLVmu7IwBnt1tw.user.speranza.aioe.org
Mime-Version: 1.0
X-Complaints-To: abuse@aioe.org
User-Agent: 40tude_Dialog/2.0.15.1
X-Notice: Filtered by postfilter v. 0.8.2
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Date: 2012-06-20T16:13:36+02:00
List-Id: <comp.lang.ada>

On Wed, 20 Jun 2012 08:39:50 -0500, Nasser M. Abbasi wrote:

[...]
> But, and here is the problem, when I turn off assertions, I am
> now left with the push() function with no check at all for
> the case of the stack is full.
> 
> So, what is one to do? use pre/post AND also add
> an extra check for full stack in the code as before?
> does not make sense.

This is what constitutes the core inconsistency about dynamic
pre-/post-conditions. If they #1 implement behavior (e.g the stack contract
to raise something when full), then they cannot be suppressed and do not
describe the contract. If they do describe the contract #2, they may not
implement it and thus shall have no run-time effect.

> They seem to definitely be something good to have.

Not everything is what it seems...

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de