Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!husc6!cmcl2!brl-adm!umd5!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.lang.c
Subject: Re: offsetof (was Arithmetic on NULL)
Message-ID: <9105@mimsy.UUCP>
Date: Mon, 26-Oct-87 09:38:50 EST
Article-I.D.: mimsy.9105
Posted: Mon Oct 26 09:38:50 1987
Date-Received: Thu, 29-Oct-87 21:21:53 EST
References: <1459@cullvax.UUCP> <48400001@tub.UUCP> <1151@haddock.ISC.COM> <907@sugar.UUCP>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 18

>>In article <1076@jenny.cl.cam.ac.uk> am@cl.cam.ac.uk (Alan Mycroft) writes:
>>|... ANSI (Oct 86) specifically disallows unary-& from appearing in
>>|constant expressions ....

In article <907@sugar.UUCP> peter@sugar.UUCP (Peter da Silva) writes:
>Does this mean the following use of & in &STD_Gadget[n], which is being
>used in a context that requires a constant expression, is not ANSI standard?

[Example in which & is legal according to K&R, but not according to
the aforementioned draft ANS.]

It *was* not, but the committee appears to be reinstating K&R rules:
that an expression that reduces to a previously declared global or
static variable, optionally with an integer constant offset, is a
constant expression.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7690)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris