Re: #if query

Article View: comp.std.c

Article #2694

#2694

From: Doug Gwyn
Date: Sat, 06 Apr 1991 04:50

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In article <1991Apr5.161945.889@vixvax.mgi.com> cepek@vixvax.mgi.com writes:
>Does ANSI really state that
>       #if ABC == DEF
>evaluates to FALSE if symbol DEF is not defined!?

No -- undefined identifiers are replaced by 0 in #if expressions.
That was existing behavior in e.g. the Reiser CPP.

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References: <1991Apr5.161945.889@vixvax.mgi.com>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!gatech!ncar!hsdndev!cmcl2!adm!smoke!gwyn
From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.std.c
Subject: Re: #if query
Message-ID: <15739@smoke.brl.mil>
Date: 6 Apr 91 04:50:47 GMT
References: <1991Apr5.161945.889@vixvax.mgi.com>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
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