[C++-sig] How do I make correct wrappers to interfaces while using shared_ptrs?

[Adam Preble]

I am trying to run this on Win32, using Stackless Python 2.6, and Boost
1.47.

I am having a problem with passing a shared_ptr of a C++ object
implementing a C++ interface to a wrapper of a Python object implementing a
C++ interface.  That's a mouthful, so I thought I'd simplify the code.  The
thing is, I can't seem to get the wrapping correct.  If I can get this
going, I can start adding complication to it and see what the problem
really is.

Basically, I have an interface that works with itself for communicating
stuff.  There is a C implementation of it, and a Python implementation of
it.  I have to write a wrapper.  The Python implementation can communicate
with instances of the C implementation, but not vice versa.  When the C
implementation calls the Python one, I get:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: No to_python (by-value) converter found for C++ type: class
boost::shared_ptr<class Communicatable>

The magic call is in the python script.

Python script
http://pastebin.com/DJ65tKEW

Header
http://pastebin.com/6BX8e6KA

Source (Boost.Python declarations here)
http://pastebin.com/s5YC1hyC

I have done similar wrappers like this before so I'm just befuddled about
why this time it hates me.  The shared_ptrs are part of the larger problem
I'm trying to reproduce, so I want to incorporate them into this test
program.  In the larger program, while doing a get_override() call on a
wrapper to an interface, I get a segfault inside the Python DLLs while it
tries to convert the shared_ptr.  The last line I can see i
shared_ptr_to_python.hpp:

        return converter::registered<shared_ptr<T>
const&>::converters.to_python(&x);

That's what I am eventually hoping to reproduce by shooting back and forth
all this stuff.
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