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: Mon, 26 Jun 2017 09:58:07 +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> <4ad48635-aa1e-45bf-8693-1f77d5fee490@googlegroups.com> NNTP-Posting-Host: vZYCW951TbFitc4GdEwQJg.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 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 X-Notice: Filtered by postfilter v. 0.8.2 Content-Language: en-US Xref: news.eternal-september.org comp.lang.ada:47119 Date: 2017-06-26T09:58:07+02:00 List-Id: On 25/06/2017 22:50, Maciej Sobczak wrote: >> It is frequently used design pattern to leave some parts of construction >> used by the parent type to the children. > > I have never heard the name of this "design pattern", but if I > understand the description correctly, I can do that in C++. So there is > no need for anything more evolved. The example must demonstrate dispatch to the operation of the object's type (the ultimate type) from a body defined for the parent type T class. > C++ has stronger type safety than Ada in this particular context. It is apples and oranges. As I explained C++ has type-specific constructors while Ada's Initialization is a class-wide constructor. You cannot compare them. Obviously for daily use type-specific constructors are much more useful than class-wide ones, IMO. I am far from being satisfied with the Initialize/Finalize/Adjust hack. > I'm fine with it. If it's wrong for you, let's agree to disagree. It is always unsafe to use one method instead of another. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de