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=0.6 required=5.0 tests=BAYES_00,TO_NO_BRKTS_FROM_MSSP autolearn=no autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,ce0900b60ca3f616 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-11-05 10:32:41 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!cyclone.bc.net!sjcppf01.usenetserver.com!usenetserver.com!newsfeeder.randori.com!out.nntp.be!propagator-SanJose!in.nntp.be!newsranger.com!www.newsranger.com!not-for-mail Newsgroups: comp.lang.ada From: Ted Dennison References: <9rti6v$hcu$1@news.huji.ac.il> <1EyE7.10050$xS6.13527@www.newsranger.com> <9rue9f$j4t$1@nh.pace.co.uk> <9ruiet$kqg$1@nh.pace.co.uk> <3BE3235D.E292B890@boeing.com> <9s6a60$a49$1@nh.pace.co.uk> Subject: Re: List container strawman Message-ID: X-Abuse-Info: When contacting newsranger.com regarding abuse please X-Abuse-Info: forward the entire news article including headers or X-Abuse-Info: else we will not be able to process your request X-Complaints-To: abuse@newsranger.com NNTP-Posting-Date: Mon, 05 Nov 2001 13:31:58 EST Organization: http://www.newsranger.com Date: Mon, 05 Nov 2001 18:31:58 GMT Xref: archiver1.google.com comp.lang.ada:15832 Date: 2001-11-05T18:31:58+00:00 List-Id: In article <9s6a60$a49$1@nh.pace.co.uk>, Marin David Condic says... >generic > type Something is private ; >package A_Package is > type Something_Else is private ; >private > type Something_Else is record > X : Some_Type_Derived_From_Controlled_Along_Some_With_Chain ; > end record ; >end A_Package ; > >Without having passed anything like this past a compiler, I just don't know >if it is legal and gets Ted the ability to instantiate the generic from >within a non-library-level scope. The problem with this approach is that the X field in Something_Else can have no knowledge of any of other the fields in Something_Else, and thus is unable to control it. It can control itself, but not its parent Something_Else. I think you can sometimes use tricks like this if the thing being controlled has nothing to do with any of the generic parameters (or anything dependant upon them). But in all other cases you are hosed, as near as I can tell. --- T.E.D. homepage - http://www.telepath.com/dennison/Ted/TED.html No trees were killed in the sending of this message. However a large number of electrons were terribly inconvenienced.