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Newsgroups: comp.unix.bsd.netbsd.misc Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!nntp.coast.net!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!deshaw.com!christos From: christos@deshaw.com (Christos Zoulas) Subject: Re: What is __P() for? Message-ID: <DIs1rJ.GMz@deshaw.com> Sender: usenet@deshaw.com Nntp-Posting-Host: es2 Organization: D. E. Shaw & Co. References: <498eac$2gm@taco.cc.ncsu.edu> Date: Tue, 28 Nov 1995 23:40:30 GMT Lines: 26 In article <498eac$2gm@taco.cc.ncsu.edu> kpneal@eos.ncsu.edu (Kevin P. Neal) writes: >What is the purpose of this: > >int __P(functname(int arg)); > >(Did I do that right?) What is the point? Doesn't it just >get converted by the preprocessor into (funct...) anyway? > >I think this has something to do with ANSI C, but what is the >story behind it? > I'll answer this one, but please in the future poke a bit around before you ask... You should look for it's #define definition in /usr/include: In <sys/cdefs.h> it says: #if defined(__STDC__) || defined(__cplusplus) #define __P(protos) protos /* full-blown ANSI C */ ... #else /* !(__STDC__ || __cplusplus) */ #define __P(protos) () /* traditional C preprocessor */ ... #endif christos