[C++-sig] C++ destructor calling of boost.python wrapped objects

Dear All, does boost.python provide any guarantee when the C++ destructor of a wrapped object is called considering the moment of reaching the zero reference count of the python object? I am concerned about a C++ object that does some I/O (file close) at its destruction. I mean: A=MyBoostPythonObject() del A # Is the C++ destructor of MyBoostPythonObject called here? Thanks, Gabor