[boost] enum pickle issue in boost python

23 Nov 2006

      Both pickle and cPickle seem to have problem pickling boost wrapped enum 
types.
Pickle protocol used here is 2.

Problem is causes by enum.cpp. In there __name__ and __module__ are 
intentionally set in certain way (which is different than how its done in 
class.cpp). So I suppose there is a valid reason why its that way.

In that case the __reduce__ and __reduce_ex__ implementation for enum_ 
should take care of this so as to ensure proper pickling.

Example:

import EnumTest
import cPickle

try:
   print "Lets pickle some boost enum:"
   f = open("tmp1.txt", "w")
   cPickle.dump( EnumTest.Color.red , f, cPickle.HIGHEST_PROTOCOL)
except:
   print "FAIL\n"

try:
   print "Why is EnumTest.Color.__name__ = '%s' and 
\nEnumTest.Color.__module__= '%s' ?\n" % ( EnumTest.Color.__name__, 
EnumTest.Color.__module__)
   print "Lets hack it and try again:"
   f = open("tmp2.txt", "w")
   EnumTest.Color.__name__ = "Color"
   EnumTest.Color.__module__ = "EnumTest"

   l = (EnumTest.Color.red, EnumTest.Color.green, EnumTest.Color.blue)

   for e in l:
      cPickle.dump( e , f, cPickle.HIGHEST_PROTOCOL)
   f.close()

   print "PASS\n"

   print "Unpickle Test:"
   f = open("tmp2.txt", "r")
   for e in l:
      if e != cPickle.load(f):
         raise "Load Failed"
   print "PASS\n"
except:
   print "FAIL\n"

Thanks
-Shashank

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[boost] enum pickle issue in boost python

Shashank Bapat