   Boost::Python and operator()
  Hi there,I am wrapping a C++ matrix class so it can be used as a python module. I have an element access operator in C++float& operator() (int i, int j)  which I''d like to be able to call from python, ideally as a subscript [i,j] or something.I haven''t been able to find any documentation which helps with this. Does anyone here know anything about it?tia,chris 