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,a644fa9cd1a3869a X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-11-22 18:22:00 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!out.nntp.be!propagator-SanJose!in.nntp.be!newsranger.com!www.newsranger.com!not-for-mail Newsgroups: comp.lang.ada From: Ted Dennison References: <3BECA3B7.5020702@telepath.com><3BF0247D.4500975E@san.rr.com><5BXH7.22252$xS6.34813@www.newsranger.com><3BF052D3.ECEF3FF2@san.rr.com><3BF19FF8.7FE097EF@boeing.com><3BF27410.C899A16B@brighton.ac.uk><3BF3EDE5.FE0ED701@brighton.ac.uk> <700ht9.6k1.ln@127.0.0.1> <9tht9a$2j1ni$1@ID-25716.news.dfncis.de> Subject: Re: List container strawman 1.2 Message-ID: <3piL7.34607$xS6.59455@www.newsranger.com> 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: Thu, 22 Nov 2001 21:21:51 EST Organization: http://www.newsranger.com Date: Fri, 23 Nov 2001 02:21:51 GMT Xref: archiver1.google.com comp.lang.ada:16887 Date: 2001-11-23T02:21:51+00:00 List-Id: In article <9tht9a$2j1ni$1@ID-25716.news.dfncis.de>, Nick Roberts says... > >My approach to solving the problem of 'safe pointers' is to have the >'pointers' (I call them 'cursors') inside the list type. This way they can >be checked by any list operation for validity (and internally updated as >necessary), and they can be referenced by number (1, 2, 3, etc.) for maximum >simplicity. I find that solution slightly inferior, as it only allows one iterator at a time, whereas the other one allows as many as you want. --- 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.