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.fn3LatRFkm9/xzEj7F2/NQ.user.gioia.aioe.org!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Simple Data Endianness Date: Thu, 13 Feb 2020 16:57:43 +0100 Organization: Aioe.org NNTP Server Message-ID: References: <2a19cdb1-6f01-4b1d-8597-b6ee21ed60ed@googlegroups.com> <21f3f3e5-b462-4359-adf9-700c5647f573@googlegroups.com> NNTP-Posting-Host: fn3LatRFkm9/xzEj7F2/NQ.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:68.0) Gecko/20100101 Thunderbird/68.4.2 X-Notice: Filtered by postfilter v. 0.9.2 Content-Language: en-US Xref: reader01.eternal-september.org comp.lang.ada:58049 Date: 2020-02-13T16:57:43+01:00 List-Id: On 2020-02-13 16:44, Daniel wrote: > i guess you want to serialize this data between 2 diferents CPUs families. > > I think ADA only thought an automatic solution for mapped records. > > You have two solutions. > > First is really ugly: Put that type into a field of a single field mapped record. > > Sencod is also ugly: Swap by your self the 4 bytes of this 32 bits type. Gnat have for example gnat.Byte_Swapping.Swap4 library to do it. Just use a reasonable network data distribution protocol or some custom serialization/deserialization method. A protocol that uses 4 octets to transfer 4 enumeration states is not reasonable by any count. In any case, never use protocol representations to store application data. This is an exemplary case of abstraction inversion. -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de