Date: Wed, 21 Feb 2001 17:13:35 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Warner Losh <imp@village.org> Cc: "Jacques A. Vidrine" <n@nectar.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: portability sanity check Message-ID: <2056.982772015@critter> In-Reply-To: Your message of "Wed, 21 Feb 2001 08:53:57 MST." <200102211553.f1LFrvs07412@billy-club.village.org>
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In message <200102211553.f1LFrvs07412@billy-club.village.org>, Warner Losh writes: >In message <20010221094228.A93221@hamlet.nectar.com> "Jacques A. Vidrine" writes: >: Likewise if the first member were a more complex data type, but >: nevertheless the same between the different structures. >: >: It seems safe to me, but I can't explain why :-) > >It is obfuscated 'C', but it is safe. The standard requires that >(void *) &foo == (void *) &foo->s and that if s were a complex >structure that it be laid out the same in all instances of s. So I >think that it is "safe" to do that. Safe, but stupid, since type-safety is lost when doing so. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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