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From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: Including <stddef.h>
Message-ID: <11044@smoke.BRL.MIL>
Date: 13 Sep 89 07:52:36 GMT
References: <71@motto.UUCP>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 11

In article <71@motto.UUCP> dave@motto.UUCP (dave brown) writes:
>2. Include <stddef.h> at the top of my header

Recommended, since <stddef.h> is an X3J11 invention and therefore
you can expect it to follow the official rules for system headers...

>   What if they have already included it?  Is it guaranteed that it can
>   be included more than once without causing errors?

...which includes the requirement that the system header be includable
multiple times with no effect different from being included just once.