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!feeder.eternal-september.org!aioe.org!.POSTED.3d73Ybk3C5U4I2t8lv+lAQ.user.gioia.aioe.org!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Why .ads as well as .adb? Date: Mon, 3 Jun 2019 22:18:18 +0200 Organization: Aioe.org NNTP Server Message-ID: References: <28facad3-c55f-4ef2-8ef8-004925b7d1f1@googlegroups.com> NNTP-Posting-Host: 3d73Ybk3C5U4I2t8lv+lAQ.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:60.0) Gecko/20100101 Thunderbird/60.7.0 Content-Language: en-US X-Notice: Filtered by postfilter v. 0.9.2 Xref: reader01.eternal-september.org comp.lang.ada:56453 Date: 2019-06-03T22:18:18+02:00 List-Id: On 2019-06-03 21:51, Keith Thompson wrote: > "Dmitry A. Kazakov" writes: >> On 2019-06-03 09:35, Maciej Sobczak wrote: >>>> That is not possible. You cannot generate specification from >>>> implementation and conversely. >>> >>> Yes, you can. You can generate specs from implementations. >> >> No. Specification describes a class of implementations. You cannot >> deduce class from its single member. > > I suspect the point is that you *could* have an Ada-like language > in which specifications could be unambiguously generated from > implementations. That thing would not be specification. E.g. can you generate an Ada or C program from x86 machine code. The answer is, yes you can. Would it be the original program. No. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de