From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-25) on ip-172-31-91-241.ec2.internal X-Spam-Level: X-Spam-Status: No, score=0.0 required=3.0 tests=none autolearn=unavailable autolearn_force=no version=4.0.1 Path: nntp.eternal-september.org!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail From: Lawrence =?iso-8859-13?q?D=FFOliveiro?= Newsgroups: comp.lang.ada Subject: Re: In precision typing we trust Date: Thu, 28 Aug 2025 00:33:09 -0000 (UTC) Organization: A noiseless patient Spider Message-ID: <108o845$10pj9$3@dont-email.me> References: <107uv9g$3019a$1@dont-email.me> <107v1ji$303of$1@dont-email.me> <336fbb5f-a279-ea8e-67fd-f62bb00d6a89@irrt.De> <107vfb9$34cpj$1@dont-email.me> <10855lq$gj8l$1@dont-email.me> <1088h1a$19635$1@dont-email.me> <1089p1i$1ig1d$1@dont-email.me> <108aq2p$1qo9o$1@dont-email.me> <108b1r3$1sj3c$1@dont-email.me> <108dh4t$2f5h3$2@dont-email.me> <108dkik$2g20p$1@dont-email.me> <108g1cg$32gqg$2@dont-email.me> <108h6b0$3a75k$2@dont-email.me> <108iiq5$3lihe$3@dont-email.me> <108mhhk$j2jt$1@dont-email.me> <108mis1$j4cj$1@dont-email.me> <108o33p$vok4$5@dont-email.me> <108o6rp$10njb$1@dont-email.me> <108o7cm$10qct$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 28 Aug 2025 00:33:10 +0000 (UTC) Injection-Info: dont-email.me; posting-host="89032bd5e4965475471761f4f9f63eba"; logging-data="1074793"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19P9TmyGCRx/qqgRBTbUQjO" User-Agent: Pan/0.163 (Kryvyi Rih) Cancel-Lock: sha1:iXr2tY/2zDMoOuFYBscYlCpL8fw= Xref: feeder.eternal-september.org comp.lang.ada:66955 List-Id: On Thu, 28 Aug 2025 00:20:38 -0000 (UTC), Kevin Chadwick wrote: >> Ada is the best language by far for mapping registers to hardware >> or data packets via representation clauses. I have found many bugs >> in STs svd files and C code because of Adas type system. > > The reason it's so good aside from Gnats excellent size checks etc. > is due to precision types :-) But can you do type checking dynamically, at run-time? For example, in one project (a Python wrapper for receiving fanotify events from the Linux kernel), I had to deal with a sequence of packets of variable length and type. I could dispatch on the packet-type field and return correspondingly typesafe results in my wrapper.