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From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: finding offset of a member in C structures
Message-ID: <16236@smoke.brl.mil>
Date: 22 May 91 20:56:17 GMT
References: <22051@paperboy.OSF.ORG> <16220@smoke.brl.mil> <22103@paperboy.OSF.ORG>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 11

In article <22103@paperboy.OSF.ORG> dbrooks@osf.org (David Brooks) writes:
>In article <16220@smoke.brl.mil>, gwyn@smoke.brl.mil (Doug Gwyn) writes:
>|> ...  If you understood my example, you should be able to apply
>|> the technique whenever you can latch onto, for example, a pointer to a
>|> struct of the appropriate type.
>As I said, the ubiquitous uses in X don't have that luxury.

But that's merely a design botch, because in order to ask for the offset
of a structure member one HAS to have a particular structure type in mind;
to make any use of the information one has to have a suitable pointer at
hand.  (The design botch is analogous to Berkeley's CTRL(x) macro.)