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: 103376,703c4f68db81387d X-Google-Thread: 109fba,703c4f68db81387d X-Google-Thread: 115aec,703c4f68db81387d X-Google-Thread: f43e6,703c4f68db81387d X-Google-Attributes: gid103376,gid109fba,gid115aec,gidf43e6,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news4.google.com!news.glorb.com!newsfeed00.sul.t-online.de!t-online.de!irazu.switch.ch!switch.ch!news.grnet.gr!newsfd02.forthnet.gr!not-for-mail From: Ioannis Vranos Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng Subject: Re: [OT] Re: Teaching new tricks to an old dog (C++ -->Ada) Date: Mon, 28 Mar 2005 22:59:35 +0300 Organization: FORTHnet S.A., Atthidon 4, GR-17671 Kalithea, Greece, Tel: +30 2109559000, Fax: +30 2109559333, url: http://www.forthnet.gr Message-ID: <1112039976.169686@athnrd02> References: <4229bad9$0$1019$afc38c87@news.optusnet.com.au> <1110032222.447846.167060@g14g2000cwa.googlegroups.com> <871xau9nlh.fsf@insalien.org> <3SjWd.103128$Vf.3969241@news000.worldonline.dk> <87r7iu85lf.fsf@insalien.org> <1110052142.832650@athnrd02> <1lr611thktbau$.1dj95z21h7l5v.dlg@40tude.net> <1112022773.497341@athnrd02> <1112026376.920221@athnrd02> <1112034544.645999@athnrd02> NNTP-Posting-Host: athnrd02.forthnet.gr Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: athprx02.forthnet.gr 1112039976 11357 193.92.150.73 (28 Mar 2005 19:59:36 GMT) X-Complaints-To: abuse@forthnet.gr NNTP-Posting-Date: Mon, 28 Mar 2005 19:59:36 +0000 (UTC) User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: en-us, en In-Reply-To: Cache-Post-Path: newsfd02!unknown@ppp27-adsl-132.ath.forthnet.gr Xref: g2news1.google.com comp.lang.ada:10090 comp.lang.c++:47659 comp.realtime:1791 comp.software-eng:5427 Date: 2005-03-28T22:59:35+03:00 List-Id: REH wrote: >>But we can treat a double variable as a sequence of unsigned chars/plain > > chars plus copy > >>it byte by byte (char/unsigned char) to a new unsigned char/char sequence > > and have an > >>exact working copy of the original. So since we can do this for stand > > alone > >>doubles/sequences of doubles, then why can't we do this in the double > > contained in a class > >>case? >> > > I never said you couldn't. What I meant, is that the above is a safe and portable operation to do. It is guaranteed by the standard. > I was just pointing out that what you wrote was > not portable, and would not work for any arbitrary class. Besides, why > would you incur the extra time and complexity of manually moving the data > back and forth, byte-by-byte instead of just insuring the correct alignment > and letting the compiler take care of it? This question can be rephrased to: "Why is memcpy() needed?". -- Ioannis Vranos http://www23.brinkster.com/noicys