Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!novavax!twwells!bill
From: bill@twwells.uucp (T. William Wells)
Newsgroups: comp.lang.c
Subject: Re: %p and different pointer representations
Message-ID: <746@twwells.uucp>
Date: 4 Mar 89 01:40:57 GMT
References: <9382@bloom-beacon.MIT.EDU> <1089@vicorp.UUCP> <234@mstan.Morgan.COM> <16112@mimsy.UUCP> <9453@bloom-beacon.MIT.EDU> <1890@dataio.Data-IO.COM> <928@jhunix.HCF.JHU.EDU> <9765@smoke.BRL.MIL>
Reply-To: bill@twwells.UUCP (T. William Wells)
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In article <9765@smoke.BRL.MIL> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes:
: >Also, how's this for a solution:
: >#if sizeof (void *) > sizeof (void (*)())
: >#define generic_ptr (void *)
: >#else
: >#define generic_ptr (void (*)())
: >#endif
: >Then use generic_ptr instead of void *, and any pointer type
: >(including pointers to functions) will fit (as long as you remember to
: >cast everything you assign).
:
: Won't work.  There is no guarantee that an object pointer can be
: converted to a function pointer or vice-versa.

Also, the sizeofs don't work in #ifs. Not according to the dpANS, nor
in many existing compilers.

---
Bill
{ uunet | novavax } !twwells!bill
(BTW, I'm going to be looking for a new job sometime in the next
few months.  If you know of a good one, do send me e-mail.)