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=-1.2 required=5.0 tests=BAYES_00,FREEMAIL_FROM, FROM_STARTS_WITH_NUMS autolearn=no autolearn_force=no version=3.4.4 X-Received: by 10.107.29.80 with SMTP id d77mr10823625iod.27.1518482562187; Mon, 12 Feb 2018 16:42:42 -0800 (PST) X-Received: by 10.157.40.82 with SMTP id h18mr499171otd.13.1518482561974; Mon, 12 Feb 2018 16:42:41 -0800 (PST) Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.org!border1.nntp.ams1.giganews.com!nntp.giganews.com!peer02.ams1!peer.ams1.xlned.com!news.xlned.com!peer01.am4!peer.am4.highwinds-media.com!peer01.iad!feed-me.highwinds-media.com!news.highwinds-media.com!o66no1166888ita.0!news-out.google.com!s63ni2740itb.0!nntp.google.com!w142no1172200ita.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Mon, 12 Feb 2018 16:42:41 -0800 (PST) In-Reply-To: <5f36f0ae-87ed-4482-9766-561b63b1d343@googlegroups.com> Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=82.154.189.221; posting-account=rhqvKAoAAABpikMmPHJSZh4400BboHwT NNTP-Posting-Host: 82.154.189.221 References: <634e9064-33f8-42c0-9032-e630f98c89d4@googlegroups.com> <5f36f0ae-87ed-4482-9766-561b63b1d343@googlegroups.com> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: Subject: Re: troubles learning OOP: expected type "Parent.Some_Child", found type Parent'Class From: Mehdi Saada <00120260a@gmail.com> Injection-Date: Tue, 13 Feb 2018 00:42:42 +0000 Content-Type: text/plain; charset="UTF-8" X-Received-Body-CRC: 2495669455 X-Received-Bytes: 2080 Xref: reader02.eternal-september.org comp.lang.ada:50406 Date: 2018-02-12T16:42:41-08:00 List-Id: I used to think that conversion from a class-wide type to a child type need not ever be explicit, I was wrong, and it's safer that way of course. It's better to use as little redispatching or dynamic whatever as possible. I did: ELEMENT : Character renames STRING_VECTOR(Current_Index); case ELEMENT is when '(' => V_LOCAL (I) := new T_TOKEN_PARENTHESE'(La_Parenthese => '('); when ')' => V_LOCAL (I) := new T_TOKEN_PARENTHESE'(La_Parenthese => ')'); when ';' => V_LOCAL (I) := new T_TOKEN_TERMINATEUR'(Le_Terminateur => ';'); I could do the same with '+' | '-' | '*' | '/', but it would suck. I so want something like when '+' | '-' | '*' | '/' => V_LOCAL (I) := new T_Token_Operateur'(L_Operateur => T_Operateur(ELEMENT));