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,FREEMAIL_FROM autolearn=unavailable autolearn_force=no version=3.4.4 X-Received: by 10.159.37.143 with SMTP id 15mr2853412uaf.15.1490633792988; Mon, 27 Mar 2017 09:56:32 -0700 (PDT) X-Received: by 10.157.31.39 with SMTP id x36mr1744721otd.12.1490633792943; Mon, 27 Mar 2017 09:56:32 -0700 (PDT) Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!1.eu.feeder.erje.net!feeder.erje.net!2.us.feeder.erje.net!weretis.net!feeder6.news.weretis.net!feeder.usenetexpress.com!feeder1.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!n37no2907505qtb.0!news-out.google.com!m191ni11941itc.0!nntp.google.com!y18no606629itc.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Mon, 27 Mar 2017 09:56:32 -0700 (PDT) Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=194.39.218.10; posting-account=3cDqWgoAAAAZXc8D3pDqwa77IryJ2nnY NNTP-Posting-Host: 194.39.218.10 User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: Subject: Bad cursor, good cursor From: Marius Amado-Alves Injection-Date: Mon, 27 Mar 2017 16:56:32 +0000 Content-Type: text/plain; charset=UTF-8 Xref: news.eternal-september.org comp.lang.ada:46490 Date: 2017-03-27T09:56:32-07:00 List-Id: Ada 2012 compiled with latest(?) free GNAT (20160515-19) This breaks with a "bad cursor" error for Subthing_Maps.Element at line 7. But how can that be, if the cursor has just been vetted at line 6 as not No_Element, and there were no changes to the container meanwhile, not even navigation? 1 C := Thing.Find (Thing_ID); 2 if C = Thing_Maps.No_Element then 3 Thing.Insert (Thing_ID, Subthing_Maps.Empty_Map, C, Ok); 4 end if; 5 I := Subthing_Maps.Find (Thing_Maps.Element (C), Subthing_ID); 6 if I = Subthing_Maps.No_Element 7 or else Subthing_Maps.Element (I) = Preterred then 8 Thing.Update_Element (C, Add_Subthing'Access); 9 end if; (Thing is a map of Subthing_Maps. C, I are cursors of these containers, respectively. The keys are Unbounded_String. The maps are Ordered_Maps.) What might I be missing, language-wise? Or might it be a GNAT bug? Thanks.