Re: [Qemu-devel] [PATCH RFC 07/10] qapi script: support direct inheritance for struct

[Eric Blake]

On 11/05/2013 08:20 PM, Wenchao Xia wrote:
>>> +      'server': {
>>> +          '_base': 'NetworkConnectionInfo',
>>
>> Interesting idea for shorthand.  However, I would suggest that you pick
>> a different character than '_', since '_' is valid in names.  That is,
>> we already have special handling of leading '*' to mark a field as
>> optional, so I suggest something like '^' to mark a base class.  By
>> using a non-name character, it becomes more obvious that the leading
>> character has a special meaning to the qapi generator.
>>
>> I'm also not convinced yet that we want this shorthand; in particular,
>> I'm worried whether it will make the introspection patches harder to
>> write.
>>
>   I am not sure about this approach either, so put RFC tag on it. The
> purpose is allow not to define structures that would be only used once.
> 
>   What instrospection patch do you mean? Python instrospection
> mechnism? You mean there is a python utility which recognize
> only keyword "base" now?

No, I'm talking about Amos' patches to expose the qapi to the user via a
QMP command.  Last version proposed was here:
https://lists.gnu.org/archive/html/qemu-devel/2013-07/msg02494.html
although with the addition of discriminated union types in the meantime,
my understanding is Amos is planning on posting another version soon for
the 1.8 timeframe.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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