From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1MgNmp-0003J4-8p
	for qemu-devel@nongnu.org; Wed, 26 Aug 2009 15:03:59 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1MgNmk-00039I-Du
	for qemu-devel@nongnu.org; Wed, 26 Aug 2009 15:03:58 -0400
Received: from [199.232.76.173] (port=58891 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1MgNmj-00038l-N3
	for qemu-devel@nongnu.org; Wed, 26 Aug 2009 15:03:53 -0400
Received: from mail2.shareable.org ([80.68.89.115]:57551)
	by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32)
	(Exim 4.60) (envelope-from <jamie@shareable.org>) id 1MgNmi-0003o6-Gu
	for qemu-devel@nongnu.org; Wed, 26 Aug 2009 15:03:52 -0400
Date: Wed, 26 Aug 2009 20:03:35 +0100
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] Coding style,
	C++ compatible code (was Re: [Qemu-devel] [PATCH 02/22] eepro100:
	cast a void * makes no sense)
Message-ID: <20090826190335.GG25726@shareable.org>
References: <cover.1251111439.git.quintela@redhat.com>
	<51486eb6860d1680c1bce45e310dcd3aae096f43.1251111439.git.quintela@redhat.com>
	<4A928DF0.9000106@weilnetz.de> <87tyzxnwvb.fsf@pike.pond.sub.org>
	<4A953E20.8080806@mail.berlios.de> <4A954B61.4010708@redhat.com>
	<20090826170402.GA25726@shareable.org>
	<Pine.LNX.4.64.0908262236390.11828@linmac.oyster.ru>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <Pine.LNX.4.64.0908262236390.11828@linmac.oyster.ru>
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: malc <av1474@comtv.ru>
Cc: qemu-devel@nongnu.org, Anthony Liguori <aliguori@us.ibm.com>, Gerd Hoffmann <kraxel@redhat.com>, Markus Armbruster <armbru@redhat.com>

malc wrote:
> > > (1) structs pointing to each other, like this:
> > > 
> > > typedef struct A A;
> > > typedef struct B B;
> > 
> > You can use "typedef struct _A A" to be C++ compatible, but it fails
> > to be shorter so I wouldn't recommend it ;-)
> 
> This is neither C nor C++ compatible, in fact it breaks both.

You'll have to explain that statement.

It compiles fine for me in C and C++:

   typedef struct _A A;
   typedef struct _B B;

   struct _A { struct _B *b; };
   struct _B { struct _A *a; };

   A *foo(B *arg);

Using this works equally well:

   struct _A { B *b; };
   struct _B { A *a; };

-- Jamie