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 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,fd173879a595bde X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news4.google.com!newshub.sdsu.edu!elnk-nf2-pas!newsfeed.earthlink.net!stamper.news.pas.earthlink.net!newsread3.news.pas.earthlink.net.POSTED!a6202946!not-for-mail From: "Jeffrey R. Carter" Organization: jrcarter at acm dot org User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: pragma convention References: <87y8435fve.fsf@code-hal.de> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Message-ID: Date: Mon, 07 Nov 2005 07:34:02 GMT NNTP-Posting-Host: 67.3.221.231 X-Complaints-To: abuse@earthlink.net X-Trace: newsread3.news.pas.earthlink.net 1131348842 67.3.221.231 (Sun, 06 Nov 2005 23:34:02 PST) NNTP-Posting-Date: Sun, 06 Nov 2005 23:34:02 PST Xref: g2news1.google.com comp.lang.ada:6262 Date: 2005-11-07T07:34:02+00:00 List-Id: Anonymous Coward wrote: > Is there a way to explicitly define a pointer in ADA to be a raw > address as it is for C, without the pragma convention? Is that what > system.address is? No. It's possible for an access value, a convention-C pointer, and a System.Address to be 3 different things. However, it's rare for a C pointer and a System.Address to be different. > Someone stated earlier that pragma convention will ensure order is > preserved for records types passed to pragma convention, but the GNAT > manual states that pragma Convention has no effect on records: > > http://gcc.gnu.org/onlinedocs/gcc-3.3.5/gnat_rm/Effect-of-Convention-on-Representation.html What this says about record representations is that GNAT's default representation for a record is the same as C's (gcc's, specifically), so for GNAT, specifying convention C for a record doesn't change anything because the representation is already convention C. -- Jeff Carter "C's solution to this [variable-sized arrays] has real problems, and people who are complaining about safety definitely have a point." Dennis Ritchie 25