From: Glynn Clements <glynn@gclements.plus.com>
To: gumbold@bonbon.net
Cc: linux-c-programming@vger.kernel.org
Subject: Re: data structure question
Date: Mon, 16 May 2005 16:28:06 +0100 [thread overview]
Message-ID: <17032.48134.349409.976254@gargle.gargle.HOWL> (raw)
In-Reply-To: <42881ADE.2010009@bonbon.net>
gumbold wrote:
> So char abc[0] actualy pointer to chat?
No, it's an array of char.
> It should be 4 byte long on x86. I can't see it with sizeof.
It's zero bytes long.
If you had:
struct abc {
__u16 a;
__u16 b;
char abc[4];
};
then sizeof(struct abc) would be 8 and the offset of abc from the
beginning of the structure would be 4.
With:
struct abc {
__u16 a;
__u16 b;
char abc[0];
};
sizeof(struct abc) would be 4 and the offset of abc from the beginning
of the structure would still be 4 (i.e. p->abc refers to the first
byte after the structure).
--
Glynn Clements <glynn@gclements.plus.com>
next prev parent reply other threads:[~2005-05-16 15:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-15 9:32 data structure question gumbold
2005-05-15 11:02 ` Glynn Clements
2005-05-15 11:24 ` gumbold
2005-05-15 14:23 ` Glynn Clements
2005-05-16 4:00 ` gumbold
2005-05-16 15:28 ` Glynn Clements [this message]
2005-05-16 18:31 ` gumbold
2005-05-17 7:36 ` Glynn Clements
2005-05-16 19:07 ` gumbold
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