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: Latest suggestion for 202x Date: Mon, 17 Jun 2019 17:20:33 +0200 Organization: Aioe.org NNTP Server Message-ID: References: <728c4668-8fa0-4a57-a502-2bf476fc3940@googlegroups.com> <4908c3e3-18dc-4953-bf26-46f160d2ebfd@googlegroups.com> <9dcf22a2-2255-4089-b1f0-93e31448415e@googlegroups.com> <86h88obeu0.fsf@gaheris.avalon.lan> <39e749cd-de5c-44fa-b8ec-50d36f3bd52c@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/60.7.1 Content-Language: en-US X-Notice: Filtered by postfilter v. 0.9.2 Xref: reader01.eternal-september.org comp.lang.ada:56662 Date: 2019-06-17T17:20:33+02:00 List-Id: On 2019-06-17 15:35, Maciej Sobczak wrote: >> Conceptually, an array indexing operation *is* a function call. > > There are two basic aggregate data structures in software engineering: arrays and records. Both have elements, which have to be selected from the whole object. In both cases the selection operation is a mapping - hence, a function. No, record is not a mapping. A mapping (properly typed) is f : I -> V where I and V are *types*. You cannot define record members this way. Member names are not 1st class values, member values have different types. > Yet, it's convenient to claim that Ada is consistent and readable, because it has round brackets for array indexing? Right, A(I,J) is far more readable than A[I][J]. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de