Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!uflorida!haven!ncifcrf!nlm-mcs!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn )
Newsgroups: comp.lang.c
Subject: Re: Must the "switch" quantity be an integer?
Message-ID: <8709@smoke.BRL.MIL>
Date: 20 Oct 88 10:03:54 GMT
References: <6137@june.cs.washington.edu> <8706@smoke.BRL.MIL> <9711@haddock.ima.isc.com>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 11

In article <9711@haddock.ima.isc.com> karl@haddock.ima.isc.com (Karl Heuer) writes:
-In article <8706@smoke.BRL.MIL> gwyn@brl.arpa (Doug Gwyn) writes:
->If you really have to have os_t*-shaped magic numbers, consider ...
->	#define BUFPTR (&dummy_buf)
->	case (ptrint_t)BUFPTR:
-C'mon Doug, you know better than that.  That isn't a valid integral constant
-expression.

But it's an allowed extension (approved at September X3J11 meeting)
and is the best he'll be able to do along these lines.  There is no
fully portable way to use a switch expression for this.