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 10.68.227.67 with SMTP id ry3mr15794755pbc.8.1340787172283; Wed, 27 Jun 2012 01:52:52 -0700 (PDT) Path: l9ni25140pbj.0!nntp.google.com!news2.google.com!goblin1!goblin2!goblin.stu.neva.ru!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: about the new Ada 2012 pre/post conditions Date: Wed, 27 Jun 2012 10:52:53 +0200 Organization: cbb software GmbH Message-ID: <1et105d0sks1i.pcgog9ym17ym.dlg@40tude.net> References: <1mkp7fzlk1b0y.1ueinfjn48fcy$.dlg@40tude.net> <4fe72b6b$0$9504$9b4e6d93@newsspool1.arcor-online.net> <1bbvp3ghpjb5s.1go1s1qvcmagh$.dlg@40tude.net> <4fe76fad$0$9507$9b4e6d93@newsspool1.arcor-online.net> <1jt8vhzxfrv2i.eohce4d3rwx1$.dlg@40tude.net> <4fe83aaa$0$6624$9b4e6d93@newsspool2.arcor-online.net> <1pkfv0tiod3rn$.onx6dmaa3if9$.dlg@40tude.net> <1i1mp8xs3vtl2.1oc4m66qtfgzq.dlg@40tude.net>

<4fe9bde5$0$6566$9b4e6d93@newsspool4.arcor-online.net> <4fe9e7c5$0$6567$9b4e6d93@newsspool4.arcor-online.net> <4feac313$0$9504$9b4e6d93@newsspool1.arcor-online.net> 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: 2012-06-27T10:52:53+02:00 List-Id: On Wed, 27 Jun 2012 10:23:47 +0200, Georg Bauhaus wrote: > On 26.06.12 21:43, Dmitry A. Kazakov wrote: > >>> is supposed to >>> implement something that essentially agrees with Pre/Post. >> >> Sure. Anything that follows "then" in any if-statement implements something >> in agreement with the condition tested by the statement. That is the nature >> of if-statements. > > That's not what agreement of with Pre/Post should mean, If that is not, change the code. Bugs not to be tolerated. > actually. > In a DbC-correct program, the following two bodies shall have essentially > the same effect: > > A: begin > if Pre (...) then > Stmts; > else > raise Assertion_Failure; > end; > ... > > B: begin > Stmts; > ... They evidently do not have same effect. Prove that they do! -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de