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!reader02.eternal-september.org!.POSTED!not-for-mail From: Simon Wright Newsgroups: comp.lang.ada Subject: Re: How to get Ada to ?cross the chasm?? Date: Sat, 05 May 2018 08:37:27 +0100 Organization: A noiseless patient Spider Message-ID: References: <1c73f159-eae4-4ae7-a348-03964b007197@googlegroups.com> <87k1su7nag.fsf@nightsong.com> <87po2la2qt.fsf@nightsong.com> <87in8buttb.fsf@jacob-sparre.dk> <87wowqpowu.fsf@nightsong.com> <16406268-83df-4564-8855-9bd0fe9caac0@googlegroups.com> <87o9i2pkcr.fsf@nightsong.com> <87in88m43h.fsf@nightsong.com> <87efiuope8.fsf@nightsong.com> <322f9b26-01de-4753-bb50-6ef2f3d993d8@googlegroups.com> <87a7th9pd1.fsf@nightsong.com> <87h8no1nli.fsf@nightsong.com> <874ljo1hvy.fsf@nightsong.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: reader02.eternal-september.org; posting-host="4e9ac54f5fe97487ef701cdb12a6f4d6"; logging-data="11857"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX197J3jHRjeItNvwVeEzh1wLPVDScilWLhI=" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (darwin) Cancel-Lock: sha1:pO8n5F0QiHeUmus1lDlirFRYL34= sha1:nrgbfXSwih58Vo2rrBbGlBn+FLM= Xref: reader02.eternal-september.org comp.lang.ada:52000 Date: 2018-05-05T08:37:27+01:00 List-Id: "Randy Brukardt" writes: > Yes. There's an issue with vector cursors, they can become invalid > because of "sliding" -- but vector cursors are rarely used (since the > entire point of the container is to allow indexing, it's usually > accessed that way). Thanks. I suppose one could include a 'generation' value in the vector, incremented every time an element is removed or added, copied to a cursor on creation of the cursor, and checked when the cursor is used. A lot of work, for a slight amount of gain.