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=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,5c89acd494ea9116 X-Google-Attributes: gid103376,public,usenet X-Google-Language: ENGLISH,ASCII Path: g2news2.google.com!news1.google.com!news.glorb.com!news.ecp.fr!oleane.net!oleane!hunter.axlog.fr!nobody From: Jean-Pierre Rosen Newsgroups: comp.lang.ada Subject: Re: Self pointer in limited record Date: Tue, 04 Sep 2007 10:23:23 +0200 Organization: Adalog Message-ID: <1m4jbf.or7.ln@hunter.axlog.fr> References: <1183577468.034566.57830@n60g2000hse.googlegroups.com> <1188578849.187422.280620@50g2000hsm.googlegroups.com> <9fy1xoukz1e3$.h574sqmiauri$.dlg@40tude.net> <46d968ee$0$30368$9b4e6d93@newsspool4.arcor-online.net> <137iu0lr82dtb$.wqy3zjz2vr9q.dlg@40tude.net> <46d972e8$0$30384$9b4e6d93@newsspool4.arcor-online.net> <1alyfwaig93sk$.99oy269uon$.dlg@40tude.net> <46d9c138$0$4531$9b4e6d93@newsspool3.arcor-online.net> <1rt8kdcrj6tf.1qgvycc6vh357$.dlg@40tude.net> <46db2bf4$0$7699$9b4e6d93@newsspool2.arcor-online.net> <1188816674.2630.25.camel@kartoffel.vocalweb.de> <9cdmw7k85sey.85sb2t1bjefy$.dlg@40tude.net> <1mbajw59c3eir.jyl8bdp6qvj8.dlg@40tude.net> NNTP-Posting-Host: mailhost.axlog.fr Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Trace: s1.news.oleane.net 1188896462 27322 195.25.228.57 (4 Sep 2007 09:01:02 GMT) X-Complaints-To: abuse@oleane.net NNTP-Posting-Date: Tue, 4 Sep 2007 09:01:02 +0000 (UTC) User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) In-Reply-To: <1mbajw59c3eir.jyl8bdp6qvj8.dlg@40tude.net> Xref: g2news2.google.com comp.lang.ada:1724 Date: 2007-09-04T10:23:23+02:00 List-Id: Dmitry A. Kazakov a �crit : >> Abstraction is about the reduction of a real world objet to those >> elements that are relevant for a given point of view. > > Of just one object? I think that an abstraction always apply to a set of > things. What could be an abstraction of Spike, the dog? A computer abstraction of Spike-the-dog is the reduction to a computer data structure of those elements that characterize the state of Spike-the-dog and are useful for the purpose of the computer program. > In my view an abstract state machine has nothing to do with singletons. A > state machine might be a singleton, per chance. But an *abstract* state > machine is definitely a type that generalizes many concrete state machines. > There is an ambiguity in English: from what you say, I assume you parse it as an abstract (state machine); but it can also be understood as an (abstract state) machine. With the latter, you just have one machine (a singleton) whose states are abstraction of real world states. -- --------------------------------------------------------- J-P. Rosen (rosen@adalog.fr) Visit Adalog's web site at http://www.adalog.fr