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: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Strings with discriminated records Date: Wed, 30 May 2018 09:29:27 +0200 Organization: Aioe.org NNTP Server Message-ID: References: <55ce14eb-6b83-4ea0-a550-f9e1410d0b06@googlegroups.com> <704ab1a8-c954-460e-81e7-05c64fcfaba4@googlegroups.com> <71501ba6-766e-45df-927b-0ed908fba28e@googlegroups.com> NNTP-Posting-Host: MyFhHs417jM9AgzRpXn7yg.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/52.8.0 Content-Language: en-US X-Notice: Filtered by postfilter v. 0.8.3 Xref: reader02.eternal-september.org comp.lang.ada:52778 Date: 2018-05-30T09:29:27+02:00 List-Id: On 2018-05-30 12:31 AM, Randy Brukardt wrote: > "Dmitry A. Kazakov" wrote in message > news:peegke$rt1$1@gioia.aioe.org... > ... >> as a poor-man solution to supertyping. I.e. if it were possible to make >> Message a subtype of String (by providing conversions), you could simply >> write: >> >> M : Message := "Hello World"; > > Or you could just give string literals to type Message (although you'll have > to wait a bit for that capability -- but it should be in Ada 2020 - > finally). Yes, I heard about use-defined literals, I am glad they made into Ada. However subtyping per conversions is a more general approach which would work for literals too as it does with universal types. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de