Article View: comp.std.c
Article #963Re: Macro names imbedded in pp-numbers [repost]
From: Prescott K Turner
Date: Sat, 18 Nov 1989 19:23
Date: Sat, 18 Nov 1989 19:23
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1362 bytes
> Both the standard and the rationale say that in the pp-number
> 0x7e-getchar()
> it is illegal for my preprocessor to expand the getchar() macro.
> If there is a real getchar() function, it is guaranteed that the
> real function must be invoked by this expression.
The draft standard says, "Each preprocessing token is converted into a
token". Since 0x7e-getchar cannot be converted into a token, there
is an error, and the real getchar() function need not be invoked.
> I will have to add code to my scanner, and slow it down, so that
> it will not call the preprocessor if it finds a macro in the middle
> of a pp-number.
"getchar" in the middle of a pp-number should give a scanner no
more difficulty than "getchar" in the middle of an identifier, e.g.
mygetchar
--
Prescott K. Turner, Jr.
13 Burning Tree Rd., Natick, MA 01760 USA (508) 653-0357
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!tmsoft!torsqnt!jarvis.csri.toronto.edu!rutgers!usc!samsung!uunet!portal!cup.portal.com!pkturner From: pkturner@cup.portal.com (Prescott K Turner) Newsgroups: comp.std.c Subject: Re: Macro names imbedded in pp-numbers [repost] Message-ID: <24191@cup.portal.com> Date: 18 Nov 89 19:23:54 GMT References: <11134@riks.csl.sony.co.jp> Organization: The Portal System (TM) Lines: 18