[C++-sig] Pickle python subclass of C++ interface

[John Reid]

Ralf W. Grosse-Kunstleve wrote:
> I think all you need to do is add
>   .enable_pickling()
> to your Boost.Python wrapper and
>   def __getinitargs__(self):
>     return (x,y,z)
> to your subclass.
> You could also use __getstate__, __setstate__, but I'd try to work with
> just __getinitargs__ first.
> 
> See also:
> 
> http://www.boost.org/doc/libs/1_43_0/libs/python/doc/v2/pickle.html

Ok I'll give that a whirl. I was hoping to avoid doing __getinitargs__() 
for each subclass as I have quite a few of them. If I didn't have a C++ 
base class then the pickling would just work as is. There's no way I can 
get back to that sort of situation with the C++ base class is there?

Thanks,
John.




> 
> 
> ----- Original Message ----
> 
> From: John Reid <j.reid at mail.cryst.bbk.ac.uk>
> To: cplusplus-sig at python.org
> Sent: Sat, July 17, 2010 2:17:12 AM
> Subject: [C++-sig] Pickle python subclass of C++ interface
> 
> Hi,
> 
> I'm using boost.python. I want to pickle some python subclasses of a C++ base. 
> The C++ base does not have any state, it is just an interface. Is there an easy 
> way to ask the python pickling machinery to ignore the C++ base? I'm not sure if 
> I should use the boost.python pickling support or go directly down the route 
> described at
> http://docs.python.org/library/pickle.html#pickling-and-unpickling-extension-types
> 
> 
> Thanks,
> John.
> 
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