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,MAILING_LIST_MULTI autolearn=unavailable autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,fc7fc1b95198137d X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-10-30 10:01:42 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!newsfeeds.belnet.be!news.belnet.be!fr.usenet-edu.net!usenet-edu.net!enst!enst.fr!not-for-mail From: "M. A. Alves" Newsgroups: comp.lang.ada Subject: Re: Ada Address = C pointer ? Date: Tue, 30 Oct 2001 18:01:16 +0000 (GMT) Organization: ENST, France Sender: comp.lang.ada-admin@ada.eu.org Message-ID: Reply-To: comp.lang.ada@ada.eu.org NNTP-Posting-Host: marvin.enst.fr Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Trace: avanie.enst.fr 1004464901 98966 137.194.161.2 (30 Oct 2001 18:01:41 GMT) X-Complaints-To: usenet@enst.fr NNTP-Posting-Date: Tue, 30 Oct 2001 18:01:41 +0000 (UTC) To: Return-Path: X-X-Sender: In-Reply-To: <3BDEDF1D.14FE7197@Raytheon.com> Errors-To: comp.lang.ada-admin@ada.eu.org X-BeenThere: comp.lang.ada@ada.eu.org X-Mailman-Version: 2.0.6 Precedence: bulk List-Help: List-Post: List-Subscribe: , List-Id: comp.lang.ada mail<->news gateway List-Unsubscribe: , List-Archive: Errors-To: comp.lang.ada-admin@ada.eu.org X-BeenThere: comp.lang.ada@ada.eu.org Xref: archiver1.google.com comp.lang.ada:15429 Date: 2001-10-30T18:01:16+00:00 On Tue, 30 Oct 2001, Mark Johnson wrote: > "M. A. Alves" wrote: > > I am in fact using Address and Access_To_Address_Conversions(*) because I > > simply did not find out how to do the trick otherwise. For example, the C > > function is returning an array of unsigned long. I want to access that > > array without copying it. How can you do that with Interfaces.C.Strings > > or even Interfaces.C.Pointers ? > > Reread the implementation advice in B.3.... > An Ada parameter of an array type with component type T, of any mode, is passed > as a t* argument to a C function, where t is the C type corresponding to the Ada > type T. Yes, a very sensible _advice_ indeed. Somehow I feel more assured with Address_To_Access_Conversions. Actually it is more than just a feeling, according to http://adapower.com/lang/accessmem.html . But adhering to the advice surely makes for the most elegant coding. Note that by now, thanks to all, this thread has tutored all possible idioms of C-interfacing namely: * using Address_To_Access_Conversions * using Interfaces.C.Pointers * commiting to implementation advice in B.3... Well done guys! -- , M A R I O data miner, LIACC, room 221 tel 351+226078830, ext 121 A M A D O Rua Campo Alegre, 823 fax 351+226003654 A L V E S P-4150 PORTO, Portugal mob 351+939354002