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=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "J-P. Rosen" Newsgroups: comp.lang.ada Subject: Re: Strings with discriminated records Date: Thu, 31 May 2018 06:19:28 +0200 Organization: Adalog Message-ID: References: <55ce14eb-6b83-4ea0-a550-f9e1410d0b06@googlegroups.com> <51dfb377-1b3e-45ca-a211-158101efe557@googlegroups.com> <090d6eb2-9f52-4471-a22e-ce1bdf457188@googlegroups.com> <90f0f8da-dadd-4341-bc0f-dbda94b0516c@googlegroups.com> <137bcc76-2489-4557-979b-5efeecbd9289@googlegroups.com> <02ca60ab-0cf6-45d6-bed5-0358d4f5763d@googlegroups.com> NNTP-Posting-Host: XdjV4tYMtFfMKGpv0MuDzQ.user.gioia.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Complaints-To: abuse@aioe.org User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 X-Notice: Filtered by postfilter v. 0.8.3 Content-Language: fr Openpgp: preference=signencrypt Xref: reader02.eternal-september.org comp.lang.ada:52799 Date: 2018-05-31T06:19:28+02:00 List-Id: Le 30/05/2018 à 22:09, Randy Brukardt a écrit : > (B) But package use clauses make things visible that are not overloadable > (like objects), so they tend to be a substantial maintenance hazard -- > adding something to a package can make client code using use clauses illegal > because of conflicts. Adding unrelated stuff should *never* make any client > illegal (changes, obviously are different). Here I don't agree. OF COURSE, changing a specification can make client code illegal, with or without use clauses. And I would not call making code illegal a "maintenance hazard"; on the contrary, a maintenance hazard is when a change does not make code illegal, but acts differently. We know how hard Tuck fought in Ada 95 to eliminate the Beaujolais effect... -- J-P. Rosen Adalog 2 rue du Docteur Lombard, 92441 Issy-les-Moulineaux CEDEX Tel: +33 1 45 29 21 52, Fax: +33 1 45 29 25 00 http://www.adalog.fr