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Date: Wed, 13 Jun 2012 08:36:19 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] [RFC v0 5/8] object: make interfaces concrete
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: peter.maydell@linaro.org, aliguori@us.ibm.com, qemu-devel@nongnu.org, "Peter A. G. Crosthwaite" <peter.crosthwaite@petalogix.com>, paul@codesourcery.com, edgar.iglesias@gmail.com, =?ISO-8859-15?Q?Andreas?= =?ISO-8859-15?Q?_F=E4rber?= <afaerber@suse.de>, john.williams@petalogix.com, avi@redhat.com

On 06/13/2012 08:33 AM, Paolo Bonzini wrote:
> Il 13/06/2012 15:30, Anthony Liguori ha scritto:
>> Anyway, I don't like the idea of making interfaces concrete.  That means
>> that a user could directly instantiate an interface which doesn't make a
>> lot of sense.
>
> Concrete doesn't mean "instantiatable by the user".  It means
> "instantiatable period".

Interfaces are not supposed to be instantiatable by anyone.  The fact that 
object_new() is used to create the interface is an internal implementation detail.

Interfaces are stateless and by definition, never have an implementation on 
their own.  So object_new() of an interface type directly results in a useless 
object.

Regards,

Anthony Liguori

>
> Paolo
>