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=-1.2 required=5.0 tests=BAYES_00,FREEMAIL_FROM, FROM_STARTS_WITH_NUMS autolearn=no autolearn_force=no version=3.4.4 X-Received: by 10.107.70.2 with SMTP id t2mr3413884ioa.18.1515078178570; Thu, 04 Jan 2018 07:02:58 -0800 (PST) X-Received: by 10.157.67.108 with SMTP id y41mr245685oti.5.1515078178270; Thu, 04 Jan 2018 07:02:58 -0800 (PST) Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!paganini.bofh.team!weretis.net!feeder6.news.weretis.net!feeder.usenetexpress.com!feeder-in1.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!i6no205359itb.0!news-out.google.com!b73ni813ita.0!nntp.google.com!g80no206997itg.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Thu, 4 Jan 2018 07:02:57 -0800 (PST) In-Reply-To: <053b2370-5c15-4662-a9e3-e1464de206a1@googlegroups.com> Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=85.240.212.224; posting-account=rhqvKAoAAABpikMmPHJSZh4400BboHwT NNTP-Posting-Host: 85.240.212.224 References: <053b2370-5c15-4662-a9e3-e1464de206a1@googlegroups.com> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: <81d042d6-a9e0-404e-b77e-9b8ca62b08d1@googlegroups.com> Subject: Re: formal array types and default values From: Mehdi Saada <00120260a@gmail.com> Injection-Date: Thu, 04 Jan 2018 15:02:58 +0000 Content-Type: text/plain; charset="UTF-8" Xref: reader02.eternal-september.org comp.lang.ada:49750 Date: 2018-01-04T07:02:57-08:00 List-Id: > Other uses of default values are evil, because they hide an operation that > should always be explicit. For instance: > type Evil_Integer is new Integer > with Default_Value => 0; > Since 0 is a legal, useful value of type Evil_Natural, some code might work by accident when an uninitialized object happened to get the right value by default. Indeed, I can see it makes sense. Instead of default value it's better to provide a constructor method to the package's client.