Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!sun-barr!decwrl!decvax!ima!haddock!karl
From: karl@haddock.ima.isc.com (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: A nice macro
Message-ID: <13788@haddock.ima.isc.com>
Date: 21 Jun 89 17:03:51 GMT
References: <2784@solo8.cs.vu.nl>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Organization: Interactive Systems, Boston
Lines: 11

In article <2784@solo8.cs.vu.nl> maart@cs.vu.nl (Maarten Litmaath) writes:
>C arrays always begin with subscript 0. ... the solution below seems so
>straightforward:
>	bar	_foo[HIGH - LOW + 1];
>	#define		foo		(_foo - LOW)

If LOW <= 0 <= HIGH, no problem.  But this is not portable if you're trying to
emulate, say, origin-1 arrays (LOW==1), since the expression (_foo-1) could be
outside your address space.

Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint