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=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,900edaa189af2033 X-Google-Attributes: gid103376,public From: cosc19z5@Bayou.UH.EDU (Spasmo) Subject: Re: Ada95 OOP Questions Date: 1996/07/30 Message-ID: <4tk8ai$nph@Masala.CC.UH.EDU>#1/1 X-Deja-AN: 171062881 references: <4tf3l4$4hu@masala.cc.uh.edu> <4tjaai$1hp@news.ida.org> organization: University of Houston newsgroups: comp.lang.ada Date: 1996-07-30T00:00:00+00:00 List-Id: David Wheeler (wheeler@aphrodite.csed.ida.org) wrote: : Andre Spiegel (spiegel@berlin.informatik.uni-stuttgart.de) wrote: : : Spasmo writes: [Snip] : : With a use-clause, it looks better : : with Persons; use Persons; : : P : Person; : : Walk (P); : : Talk (P); : : Eat (P); Well since I try to avoid using a use-clause (I like the namespace protection I get), the above really (to me) doesn't look any better (not that the first one looked bad). : : > Correct me if I'm wrong on this. So you're still passing parameters : : > which means that data and subprograms are still 2 different entities : : > which sorta hurts the abstraction, rather than in say C++ where : : > you've got a unified object. : : You _are_ wrong. The subprograms actually _are_ a part of the object, : : and they "go" with it, so to speak of, whereever you take the object. : : It is just less obvious from the syntax in Ada. Oh. : Spiegel's right. Spasmo - you're concentrating on minor syntactic variance. : Ada treats all calls with the same syntax; C++'s syntax varies depending : on how it's defined. The difference is unimportant. Well I can live with passing parameters but still the question of inheriting operations from a parent class defined in a different module is IMO a big deal. I mean, I've looked at the Lovelace tutorial and checked on this, even looked at the OOP section in the "Core Language" section of the rationale (after a while I started skimming), but I've yet to see this. : To see an example of OO in Ada95, look at my "Small" program at: : "http://lglwww.epfl.ch/Ada/Tutorials/Lovelace/small.htm" : You'll see lots of OO concepts, and operations unified with the object. Indeed, this is what I need to do. I'm heading over there right now and looking at the program. I hope a good example (Small is mentioned a lot) will be the thing to make me realize just what it is I've been missing. : --- David A. Wheeler : Net address: dwheeler@ida.org -- Spasmo "Everyone has secrets, but sometimes you get caught, So if it's just between us, my silence can be bought" "Blackmail" by Sloppy Seconds