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: Musing on defining attributes and the ability to define an "abstract type X"-interface. Date: Sat, 5 Aug 2017 19:18:41 +0200 Organization: Aioe.org NNTP Server Message-ID: References: <9617c73b-e23e-405b-8544-4d17e7e3ad61@googlegroups.com> <28512bf1-0c2c-400f-a24f-cc7e0eb8a02d@googlegroups.com> <87h8y67trd.fsf@jacob-sparre.dk> <36a1a83d-f3d7-4e3c-827d-addeadc28ccc@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/52.2.1 X-Notice: Filtered by postfilter v. 0.8.2 Content-Language: en-US Xref: news.eternal-september.org comp.lang.ada:47613 Date: 2017-08-05T19:18:41+02:00 List-Id: On 2017-08-05 18:51, Shark8 wrote: > This is about having an "abstract type", it's about getting at the > underlying interface (general-sense, not OOP-sense) First, it is the same sense. Second, Ada has abstract types (ADT is Ada 85). The point is having hierarchies of types = classes. - Ada 85 had built-in classes. - Ada 95 added classes of tagged types with representations built by - record extension. - Ada 2005 added classes of siblings sharing null representation (Ada interfaces). There is a whole world beyond these. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de