[C++-sig] inherit an instance, or something

[Johan Rydberg]

"Roman Yakovenko" <roman.yakovenko at gmail.com> writes:

Thanks Roman!

>>   class my_extended_plugin(dso_plugin):
>>       def __init__(self, ...):
>>           dso_plugin.__init__(self, 'libmy-plygin.so')
>>
>> Where dso_plugin.__init__ would "replace" the held pointer for 'self'
>> with the one that make_plugin('libmy-plugin.so') returns.
>> [...]
> I think you can take another approach - mix between first one and the second
> + automatic redirection:
>
> class dso_plugin(plugin):
>       def __init__(self, ...):
>           plugin.__init__(self)
>           self.__o = make_plugin('libmy-plugin.so')
>
>       def __getattr__( self, name ):
>           return getattr( self.__o, name )
>
> Now you can derive your plug-ins from the dso_plugin.
>
> P.S.
> I am not sure about exact __getattr__ implementation.

But __getattr__ will only be invoked for fetching attributes from an
instance of dso_plugin, right?  Will I be able to do things like
dso_plugin.set_parameter(self, ...). In other words, override a method
and invoke the default implementation.

~j
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