On 2/19/07, Roman Yakovenko <roman.yakovenko@gmail.com> wrote:
Hi. Unfortunately I reproduced the error and was not able to  fix it :-(((((.
There is something I don't understand  and I think  this is  Boost.Python bug.

I do made some progress.

1. When you derive Python class from a C++ one you have to define __init__
    method, otherwise your code will not work:

class MyEvent(EventImpl):
    def __init__( self ):
        EventImpl.__init__( self )
    def Notify(self):
        print "Notify!"

2. I did small research for you. Read this post:
   and take a look on Boost.Python unit tests:

What I found is:
The ownership is really transfered. You can check this using simple technique:
        Add new function to EventImpl:
          virtual std::string class_name() const { return "EventImpl"; }
        Add free function:
           std::string get_class_name( const std::auto_ptr<EventImpl>& e ){
               if( e.get() ){
                   return e->class_name();
                  return "no object";
        You will get the answer "no object", after "Schedule" call.
So, may be you don't have to delete the Python object.

I will submit the bug to the Boost.Python mailing list, hope somebody will be able to help.

I found this wiki with a possible solution for the problem:


Unfortunately the provided code, after adaptions to my case, didn't even compile :-(

Gustavo J. A. M. Carneiro
"The universe is always one step beyond logic."