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!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Ada Annoyances Date: Sat, 24 Jun 2017 10:05:26 +0200 Organization: Aioe.org NNTP Server Message-ID: References: <1ac5a44b-4423-443a-a7bb-2864d9abe78f@googlegroups.com> <1498048151.20885.28.camel@obry.net> <96174ea5-852d-44e9-8535-7c1eb24d5326@googlegroups.com> <8d3aff06-82df-485f-89e5-a50c326aab05@googlegroups.com> <66aa262e-2ac9-4016-b32d-e9fee14779e1@googlegroups.com> <88e2f18a-0786-4303-a5b8-fe82e8c81dcb@googlegroups.com> NNTP-Posting-Host: MajGvm9MbNtGBKE7r8NgYA.user.gioia.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0 X-Notice: Filtered by postfilter v. 0.8.2 Content-Language: en-US Xref: news.eternal-september.org comp.lang.ada:47095 Date: 2017-06-24T10:05:26+02:00 List-Id: On 2017-06-24 00:18, pythoner6@gmail.com wrote: > Out of curiosity, why should controlled types not be tagged? And how > is C++ much different - other than that you can make destructors > non-virtual (and therefore never dynamically dispatch, though I think > the advice I usually see is to make almost all destructors virtual to > avoid the case where the wrong destructor gets called). User-defined initialization/finalization is broken in both languages, but differently. It does not need dispatch and tags. For class-wide objects as with all objects it is the responsibility of the type. Thus T and T'Class must have their own initialization/finalization hooks, which also would solve the issue of dispatch from constructor. > Again, I'm not quite sure I follow you here. What do you mean by "not > compatible with the lifetime of its parts"? That is when, for example, you have a not fully constructed object of a type used as if it were constructed. A class-wide object of type S derived from T must be constructed in this order: T S S'Class T'Class For each stage a user-defined hook called. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de