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From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: OFFSET -macro (also offsetof in ANSI-C)
Message-ID: <14590@smoke.brl.mil>
Date: 27 Nov 90 18:29:10 GMT
References: <898@ehviea.ine.philips.nl>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 8

In article <898@ehviea.ine.philips.nl> ncpg@ehviea.ine.philips.nl (ncpg) writes:
>#define	OFFSET(structPtr, field)	((unsigned short) \
>					(&((char *)(structPtr->field))) - \
>					&((char *)(structPtr)))

This wouldn't be right anyway.  It's &structPtr->field that you want to
use; you cannot apply & to the result of an object cast because it's not
an lvalue.