From -3057739656040899128 X-Google-Thread: f78e5,6978327f896d5d5b X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news2.google.com!proxad.net!fr.ip.ndsoftware.net!newsfeed.wirehub.nl!kibo.news.demon.net!mutlu.news.demon.net!demon!mail2news.demon.co.uk!devnull From: kprateek88@yahoo.com (Prateek R Karandikar) Newsgroups: comp.std.c++ Subject: Re: What is the use of the null directive # ? Date: Mon, 28 Jun 2004 02:21:52 +0000 (UTC) Organization: http://groups.google.com Lines: 28 Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: <607f883e.0406270612.4e7e423c@posting.google.com> References: <607f883e.0406251028.5412fc80@posting.google.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: mail2news.demon.co.uk 1088389312 20140 10.0.0.1 (28 Jun 2004 02:21:52 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Mon, 28 Jun 2004 02:21:52 +0000 (UTC) X-Received: from mulga.cs.mu.oz.au ([128.250.1.22]) by news.demon.co.uk with esmtp (Exim 4.12) id 1BelmJ-0005Eh-00 for mail2news@news.news.demon.net; Mon, 28 Jun 2004 02:21:51 +0000 X-Received: from mulga.cs.mu.OZ.AU (localhost [127.0.0.1]) by mulga.cs.mu.OZ.AU with ESMTP id i5S2Lmrd024223; Mon, 28 Jun 2004 12:21:48 +1000 (EST) X-Received: (from fjh@localhost) by mulga.cs.mu.OZ.AU (8.12.10+Sun/8.12.9/Submit) id i5S2LlVU024200; Mon, 28 Jun 2004 12:21:47 +1000 (EST) X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Path: comp-std-cpp-robomod!not-for-mail X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Delivered-To: std-c++@ucar.edu X-Newsgroups: comp.std.c++ X-NNTP-Posting-Date: Sun, 27 Jun 2004 14:12:42 +0000 (UTC) X-Spamscanner: mailbox8.ucsd.edu (v1.4 May 20 2004 13:55:33, 2.2/5.0 2.63) X-MailScanner: PASSED (v1.2.8 87475 i5RECgx1093618 mailbox8.ucsd.edu) X-Spam-Checker-Version: SpamAssassin 2.60-mulga_r1 (1.212-2003-09-23-exp) on mulga.cs.mu.OZ.AU X-Spam-Level: X-Spam-Status: No, hits=-2.7 required=5.2 tests=AWL,BAYES_00, FORGED_YAHOO_RCVD,FROM_ENDS_IN_NUMS autolearn=no version=2.60-mulga_r1 Xref: g2news1.google.com comp.std.c++:1046 > >What is the use of the null-directive # ? > > > > > > 16.7 Null directive [cpp.null] > >1 A preprocessing directive of the form > > # new-line > > has no effect. > > > > It allows implementors to add directives as extensions without having > impact on the portability of code using them. #pragma is already there for non-standard extensions. BTW, how can a null-directive allow implementations to add directives? The Standard specifically says that the null directive has no effect (as opposed to having an implementation-defined effect). -- -- Abstraction is selective ignorance. -Andrew Koenig -- -- --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ]