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Date: Wed, 13 Jun 2012 15:38:51 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [RFC v0 5/8] object: make interfaces concrete
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To: Anthony Liguori <anthony@codemonkey.ws>
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

Il 13/06/2012 15:36, Anthony Liguori ha scritto:
>>>
>>
>> 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.

Whose side effect is that interfaces need to be concrete.

> 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.

Yes, and that's why you needn't really care about what the user does.
Garbage in, garbage out...

Paolo