Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!zaphod.mps.ohio-state.edu!samsung!uunet!munnari.oz.au!sirius.ucs.adelaide.edu.au!levels!ccdn
From: ccdn@levels.sait.edu.au
Newsgroups: comp.lang.c
Subject: Re: sizeof(x): is x ever evaluated?
Message-ID: <15455.26fcc6df@levels.sait.edu.au>
Date: 23 Sep 90 14:29:51 GMT
References: <15454.26fa4d7e@levels.sait.edu.au>
Organization: Sth Australian Inst of Technology
Lines: 18

ccdn@levels.sait.edu.au writes:
>       #define _iorc(x) ((sizeof(x)==1)?(unsigned char)(x):(x))
>
> Is sizeof's expression parameter ever executed?  In particular need
> I be concerned about side effects in code like:
>
>       while (_ctype[_iorc(*a++)]);


A more careful reading of K&R does answer this:  "This expression [sizeof]
is semantically an integer constant".  I guess that answers my question.

Sorry for asking foolish questions.


David Newall, who no longer works       Phone:  +61 8 344 2008
for SA Institute of Technology          E-mail: ccdn@lux.sait.edu.au
"Life is uncertain:  Eat dessert first"  *Check the return address!*