Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!uunet!tdatirv!sarima
From: sarima@tdatirv.UUCP (Stanley Friesen)
Newsgroups: comp.lang.c
Subject: Re: increment casted void pointer  --  ANSI?
Message-ID: <166@tdatirv.UUCP>
Date: 11 Mar 91 17:06:17 GMT
References: <4142@rwthinf.UUCP> <1991Mar8.165300.11692@zoo.toronto.edu>
Reply-To: sarima@tdatirv.UUCP (Stanley Friesen)
Organization: Teradata Corp., Irvine
Lines: 22

In article <1991Mar8.165300.11692@zoo.toronto.edu> henry@zoo.toronto.edu (Henry Spencer) writes:
>In article <4142@rwthinf.UUCP> berg@marvin.e17.physik.tu-muenchen.de (Stephen R. van den Berg) writes:
>> b=*++(char*)p;
>> *--(char*)p=b;
>> *++(char*)p=a;
>There is no way to say "pretend this variable has a different type" in C.

Not true, there *is* a way, Stephen just didn't use it.

To pretend a variable has a different type utter the following magic
incantations:

b = *++ *(char **)&p;
*-- *(char **)&p = b;
*++ *(char **)&p = a;


Now, I consider thsi hideous code, but it *does* allow nearly arbitrary
type punning.  [the *effect* is still non-portable]
-- 
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uunet!tdatirv!sarima				(Stanley Friesen)