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: Thu, 28 Apr 2005 16:17:40 +0200 Organization: Cuivre, Argent, Or Message-ID: References: <426e4c2b$0$7515$9b4e6d93@newsread2.arcor-online.net> <1114530273.185327.319710@z14g2000cwz.googlegroups.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 1114697959 12134 212.85.156.195 (28 Apr 2005 14:19:19 GMT) X-Complaints-To: usenet@melchior.cuivre.fr.eu.org NNTP-Posting-Date: Thu, 28 Apr 2005 14:19:19 +0000 (UTC) Cc: comp.lang.ada@ada-france.org To: Matthew Heaney Return-Path: In-Reply-To: <1114530273.185327.319710@z14g2000cwz.googlegroups.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:10782 Date: 2005-04-28T16:17:40+02:00 > > (1) efficiency - suppose (for example) I want to transmit the > contents > > of my vector down a socket. > > You're not grokking the Ada95 way of doing things. Use the stream > operations for that. All containers (indeed, all non-limited types in > the predefined language environment) support streaming. By the way, I let this one drop, but in fact I wasn't thinking of sending/ receiving the whole vector down the socket, just parts of it: using the vector as an extensible buffer for building up and processing packets according to some communications protocol. The Element_Type would be Stream_Element in this case. Sending the vector object itself makes no sense in such a setting. Anyway, it's my fault for forgetting to say I only wanted to transmit slices. The other kind of thing I had in mind was linear algebra operations done by eg a Fortran library. For similar efficiency reasons you really have to be dealing with contiguous memory - copying things all over the place costs too much. No need to reply to this email by the way - you've already explained that Vector was not intended to necessarily be implemented as a contiguous array. Ciao, D.