16424250/return-class-pointer-to-lua-with-luabind

Block 1:
    void AddValueToP(int aValue)
    {
        g_P->AddValue(aValue);
    }

    module(L)
    [
        def("AddValueToP", &AddValueToP)
    ]

Block 2:

    class P
    {
        public: AddValue(int);
    }

    module(L)
    [
        class_<P>("P")
        .def(constructor<>())
        .def("AddValue", &P::AddValue)
    ]