Date: Thu, 4 Jun 1998 23:16:11 -0700 (PDT) From: Julian Elischer <julian@whistle.com> To: Chris Csanady <cc@swing.ca.sandia.gov> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: style(9) error? Message-ID: <Pine.BSF.3.95.980604231026.16963A-100000@current1.whistle.com> In-Reply-To: <199806042122.QAA00625@swing.ca.sandia.gov>
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not th econditional part, the THEN clause.. e.g. if (condition) MACRO(x); else MACRO2(y); evaluates correctly to: if (condition) do { sdfdfsg; sdfghdghh; } while (0); else do { ffdgdfsgs; sdfgsdfgsIdg; } while (0); which is what you require, Hopefully the compiler will remove the un-needed loping code. (certainly it will since this is so commmon.) julian On Thu, 4 Jun 1998, Chris Csanady wrote: > > I would like to make use of a feature that style tells me I can use, but > gcc tells me I can not.. > > From style(9): > > es, it makes it easier to read. If the macro encapsulates a compound > statement, enclose it in a ``do'' loop, so that it can safely be used in > ``if'' statements. Any final statement-terminating semicolon should be > supplied by the macro invocation rather than the macro, to make parsing > easier for pretty-printers and editors. > > #define MACRO(x, y) do { \ > variable = (x) + (y); \ > (y) += 2; \ > } while(0) > > As far as I can tell, it is impossible to put a do loop in a if statement, > or anything else. Is this correct? I always thought that blocks evaluated > to their last statements, but it seems not.. > > Chris Csanady > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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