[boost] boost/python: how to: call memberfunctions of an existing c++ object from python?

From: Marco Borm (mb.ml.boost_at_[hidden])
Date: 2005-03-09 11:38:57

Hi Boost/Python developers,

at first I have to say that I am no boost nor a python expert.
I've searched for hours now on the web for my problem but was unable to 
find some solution for my problem:

Currently I am working on the possibility that an python-script is 
called by an existing c++ object. This was "easy" to do with and without 
the boost python-classes.

To make this more complicate, the script must be able to call some 
member functions of this object.
So to make this possible I created an BOOST_PYTHON_MODULE() containing 
the class and the to be called member function-definitions.
Now it is possible to create new instances of the class and call them 
from python. It is also possible to do the following in my c++ 
object-code: "ret = boost::python::call<int>(PyFunction.ptr(), this );"

But now my problem: boost copies the object and passes only that copy to 
the function.
Is it and how is it possible to make the object accessible to the 
function within the python-script?
I have found some hints in the boost-source for using smartptr but I was 
unable to use them as an parameter for call(): "TypeError: No to_python 
(by-value) converter found for C++ type: class boost::shared_ptr<TYPE>".
I am also don't known if this is the right way to do.

Thanks for help!
Marco Borm