[C++-sig] Pickle an enum from c++

[Matthew Scouten (TT)]

>From the lack of response I assume that no one has any clever ideas to
make an enum pickleable.  Thank you to anyone who put thought into this.
If I come up anything that works, I will let the group know.

 

From: Matthew Scouten (TT) 
Sent: Tuesday, December 02, 2008 2:24 PM
To: Development of Python/C++ integration
Subject: Pickle an enum from c++

 

I have an enum in my c++ library. In fact I have a crap load of them.
169 to be exact. 

 

I need them to be pickle-able.  The enum_ object does not have a
.def_pickle function, so I cannot use the pickle suite. I tried to just
up and pickle it but that does not work either.

 

 enum box {cardboard, cereal, toy};

 

BOOST_PYTHON_MODULE(busybox)

{

 

    enum_<box>("box")

        .value("cardboard",cardboard )

        .value("cereal",cereal )

        .value("toy", toy);

 

}

 

C:\Documents and Settings\mscouten>cd C:\tt-dev\manticore\

 

C:\tt-dev\manticore>call setpath.bat

Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit
(Intel)] on win32

Type "help", "copyright", "credits" or "license" for more information.

>>> import pickle, busybox

>>> 

>>> b = busybox.box.toy

>>> 

>>> bs = pickle.dumps(b)

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "C:\Python25\lib\pickle.py", line 1366, in dumps

    Pickler(file, protocol).dump(obj)

  File "C:\Python25\lib\pickle.py", line 224, in dump

    self.save(obj)

  File "C:\Python25\lib\pickle.py", line 331, in save

    self.save_reduce(obj=obj, *rv)

  File "C:\Python25\lib\pickle.py", line 401, in save_reduce

    save(args)

  File "C:\Python25\lib\pickle.py", line 286, in save

    f(self, obj) # Call unbound method with explicit self

  File "C:\Python25\lib\pickle.py", line 562, in save_tuple

    save(element)

  File "C:\Python25\lib\pickle.py", line 286, in save

    f(self, obj) # Call unbound method with explicit self

  File "C:\Python25\lib\pickle.py", line 748, in save_global

    (obj, module, name))

pickle.PicklingError: Can't pickle <class '__main__.busybox.box'>: it's
not found as __main__.busybox.box

>>> 

 

 

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