Ralf W. Grosse-Kunstleve wrote:
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?
I don't know, but there may be. One (totally untested) idea would be to
give the base class __getstate__ and __setstate__ methods that inspect the
instance to re/store the state. Maybe you just need to return and restore
self.__dict__?
I guess you could mix-in the __getstate__, __setstate__ methods.
Ralf
I'm not sure what you mean by mix-in, but my first attempt involved
defining pickle suite getstate() and setstate() methods. I did not
define a getinitargs() method. Unfortunately when the derived object was
unpickled, __init__ was called with no arguments. As far as I can see
there's no way to use the boost.python pickle suite that does not
involve a call to __init__() on the unpickled object.
I'll try having a go using the python pickling protocol's __reduce__()
method.
John.
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