#include <boost/python.hpp>

class Owner
{
    public:
        Owner();
        ~Owner();
}

class Data
{
    private:
       Owner *m_owner;
    public:
        Data(Owner *owner) {
            // Transfer ownership
        m_owner = owner
    }
        ~Data() {
        if (!m_owner->m_calling_destructors) { err_printf("ERROR: Shouldn't be called directly"}
    }
}


BOOST_PYTHON_MODULE(datatest)
{
    using namespace boost::python;

    class_<Owner>("Owner", init<>());

    class_<Data, init<Router *>()>;
}