Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!ll-xn!husc6!cmcl2!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn )
Newsgroups: comp.lang.c
Subject: Re: Unions
Message-ID: <8727@smoke.BRL.MIL>
Date: 22 Oct 88 19:48:37 GMT
References: <322@hrc.UUCP> <2699@hound.UUCP> <976@l.cc.purdue.edu> <14103@mimsy.UUCP> <6176@june.cs.washington.edu>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 7

In article <6176@june.cs.washington.edu> pardo@cs.washington.edu (David Keppel) writes:
>Interesting note: gcc preserves the high-order bits of the union.
>I believe that this behavior is not guaranteed either by K&R or by the
>dpANS proposed standard.  (Anybody know?  Tell me, please?)

Nothing is promised about other members of a union when one member is
modified, just as nothing is promised about the holes in a structure
or union.