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 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!mx02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: SPARK: missing case value Date: Fri, 9 Oct 2015 23:01:33 +0200 Organization: cbb software GmbH Message-ID: <8ea6wfytssdg.1ake0jrn1irc8.dlg@40tude.net> References: <87twq09ke2.fsf@theworld.com> Reply-To: mailbox@dmitry-kazakov.de NNTP-Posting-Host: j6IQVb9uobzjXrpQLDU2rQ.user.speranza.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: 40tude_Dialog/2.0.15.1 X-Notice: Filtered by postfilter v. 0.8.2 Xref: news.eternal-september.org comp.lang.ada:27956 Date: 2015-10-09T23:01:33+02:00 List-Id: On Fri, 9 Oct 2015 22:29:21 +0200, Georg Bauhaus wrote: > A precondition states conditionality of proper execution. You said that. Proper execution should be unconditional to the program state. Otherwise it is called 'bug'. Ergo, precondition, especially a dynamic one, is a method of introducing bugs. I called it a mine because these bugs are well hidden, disguised as something appearing useful and improving program design... > (To me, it seems improper to narrow contract based design to what > seem to be expressions of disbelief in anything mathematical truth > before the fact. Static_Predicate says less than Predicate, and > less is less practical, as of now, I think.) No idea what this was supposed to mean. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de