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From: willcr@bud.sos.ivy.isc.com (Will Crowder)
Newsgroups: comp.lang.c
Subject: Re: Pointer and integer addition
Message-ID: <1991Apr11.173431.15547@ism.isc.com>
Date: 11 Apr 91 17:34:31 GMT
References: <8334@umd5.umd.edu> <15631@smoke.brl.mil> <4205@rwthinf.UUCP>
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In article <4205@rwthinf.UUCP>, berg@marvin.e17.physik.tu-muenchen.de
(Stephen R. van den Berg) writes:

|> In article <15631@smoke.brl.mil> gwyn@smoke.brl.mil (Doug Gwyn) writes:
|> >In article <8334@umd5.umd.edu> dzoey@terminus.umd.edu (Joe Herman) writes:
|> >>fooptr = (char *) fooptr + fooptr->recsize;
|> 
|> >This (almost) should have worked.  You also need to convert back to
|> >the proper pointer type before the assignment:
|> 
|> >	fooptr = (struct foo *) ((char *) fooptr + fooptr->recsize);
|> 
|> No, not needed, the cast is implicit.

But will result in a compiler warning on most compilers.  It also makes it
quite clear what is going on.  You cannot blithely assign one pointer type
to another without expecting some kind of complaint from the compiler.

|> --
|>            Stephen R. van den Berg.

--------------------------------------------------------------------------------
Will Crowder, MTS            | "I was gratified to be able to answer promptly,
(willcr@ivy.isc.com)         |  and I did: I said I didn't know."
INTERACTIVE Systems Corp.    |		-- Mark Twain