From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.5-pre1 (2020-06-20) on ip-172-31-74-118.ec2.internal X-Spam-Level: X-Spam-Status: No, score=-1.9 required=3.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.5-pre1 Path: eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail From: "J-P. Rosen" Newsgroups: comp.lang.ada Subject: Re: Unchecked_Deallocation with tagged types Date: Sun, 18 Apr 2021 12:20:56 +0200 Organization: Adalog Message-ID: References: <607b56f8$0$3721$426a34cc@news.free.fr> <07863309-4541-4497-8cec-d88179e634bdn@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Sun, 18 Apr 2021 10:20:55 -0000 (UTC) Injection-Info: reader02.eternal-september.org; posting-host="b5d35539180fcd3fb4ca52633132312b"; logging-data="2528"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18rR5JcYKqcD8qICJZXMV/x" User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1 Cancel-Lock: sha1:T/D6zGp2nElLIyt2+oZ7NOXGLTg= In-Reply-To: Content-Language: fr Xref: reader02.eternal-september.org comp.lang.ada:61820 List-Id: Le 18/04/2021 à 11:09, Jeffrey R. Carter a écrit : > On 4/18/21 10:46 AM, Gautier write-only address wrote: >> Side note: did anyone already suggest a new keyword: unchecked_free >> and a special statement: >> >>    unchecked_free Some_Pointer; > > For every access variable P, there could exist the attribute procedure > >   P'Free; > Which would defeat the goal of Unchecked_Deallocation. Ada (or more precisely Ichbiah) chose to deallocate through an instantiation of a generic for good reason. Deallocation is a place where many problems can come from, it is important to be able to trace where they are. The current solution forces you to put "with Unchecked_Deallocation" on top of every module that deallocates, therefore telling the reader that there is some danger in it, and making it easier to find where all the deallocations happen. Now, I know that in those days, ease of writing is considered more important than ease of reading and long term maintenance... -- 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