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=-2.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM, MAILING_LIST_MULTI autolearn=unavailable autolearn_force=no version=3.4.4 X-Google-Thread: 103376,1fa85f3df5841ae1 X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news4.google.com!news2.google.com!proxad.net!usenet-fr.net!news.enst.fr!melchior!cuivre.fr.eu.org!melchior.frmug.org!not-for-mail From: Duncan Sands Newsgroups: comp.lang.ada Subject: Re: Ada.Containers.Vectors - querying multiple elements Date: Tue, 26 Apr 2005 18:59:11 +0200 Organization: Cuivre, Argent, Or Message-ID: References: <426e4c2b$0$7515$9b4e6d93@newsread2.arcor-online.net> <1114530273.185327.319710@z14g2000cwz.googlegroups.com> <1114531544.32583.142.camel@localhost.localdomain> <426E72C3.9070108@on2.com> NNTP-Posting-Host: lovelace.ada-france.org Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Trace: melchior.cuivre.fr.eu.org 1114534769 76955 212.85.156.195 (26 Apr 2005 16:59:29 GMT) X-Complaints-To: usenet@melchior.cuivre.fr.eu.org NNTP-Posting-Date: Tue, 26 Apr 2005 16:59:29 +0000 (UTC) Cc: comp.lang.ada@ada-france.org To: Matthew Heaney Return-Path: In-Reply-To: <426E72C3.9070108@on2.com> X-Mailer: Evolution 2.2.1.1 X-Virus-Scanned: by amavisd-new-20030616-p10 (Debian) at ada-france.org X-BeenThere: comp.lang.ada@ada-france.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Gateway to the comp.lang.ada Usenet newsgroup" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Xref: g2news1.google.com comp.lang.ada:10723 Date: 2005-04-26T18:59:11+02:00 > >>A vector container isn't necessarily implemented as an array, so there > >>are no benefits to having array-based operations. > > > > > > Not so. There is a benefit if array-based operations can be implemented > > much more efficiently in the body of Ada.Containers.Vectors (where > > properties of the data structure can be fully exploited), as compared to > > implementing them outside the body (via copying to a buffer using multiple > > calls to Element). The pointer-to-an-array implementation is an example > > where you get a big benefit from implementing in the body; that's not to > > say there is no benefit for other implementations. > > > What you really want is to take advantage of the container > representation to implement an algorithm more efficiently. That's fine. > Ada95 has a specific technique for that: make the algorithm a child > subprogram. > > Instead of trying to bring the mountain to Mohammed, bring Mohammed to > the mountain... But isn't it illegal to create a child of package Ada? Ciao, D.