Article View: borland.public.cppbuilder.nativeapi
Article #10696Re: exception "catch" clause
From: Bob Gonder
Date: Fri, 26 Mar 2004 00:32
Date: Fri, 26 Mar 2004 00:32
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p Anders wrote: >I have several macros defined - some use the parenthesis and some don't - >when are these required and when not? Or maybe they're not required at >all??? In general, no, they aren't required. But... you can get into trouble in some situations if they aren't used.... Consider #define SomeNumber 10+24*13+27 int i = SomeNumber; /* ok */ int j = SomeNumber+32; /* ok */ int k = SomeNumber*7; /* ?? */ IOW, where the macro is going to be used as a sub-expression, parenthesis are good. #define condition (i<j) if condition // if (i<j) ok if( condition ) // if( (i<j) ) ok if ! condition // if ! (i<j) not ok But code generally doesn't contain parens, so putting parens around a code macro is probably wrong. Remember, everything you put in a macro, parens and all, goes into the expanded code. So, if you can't write the original code with parens, then you can't write the macro with them either.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10cc67,d6b749007e0005d0 X-Google-Attributes: gid10cc67,public X-Google-ArrivalTime: 2004-03-25 16:39:46 PST From: Bob Gonder <notbg@notmindspring.invalid> Newsgroups: borland.public.cppbuilder.nativeapi Subject: Re: exception "catch" clause Date: Thu, 25 Mar 2004 16:32:46 -0800 Organization: MindSpring Enterprises, Inc. Reply-To: notbg@notmindspring.invalid Message-ID: <mnt660lm9g2ebth873f7bpb93gcit1j409@4ax.com> References: <4062cd03$1@newsgroups.borland.com> <4062db62$1@newsgroups.borland.com> X-Newsreader: Forte Agent 1.93/32.576 English (American) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit NNTP-Posting-Host: 67.31.164.117 X-Trace: newsgroups.borland.com 1080261167 67.31.164.117 (25 Mar 2004 16:32:47 -0800) Lines: 29 Path: arc1-ca.pugleaf.net!archiver1.google.com!news2.google.com!news.maxwell.syr.edu!newsfeed.icl.net!news-FFM2.ecrc.net!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail