Hi, When using the boost python v2 to port a C++ member function like the following, I got an error with message "TypeError: bad argument type for built-in operation". class A; A* MyClass::foo(int n = 100); This only happens when a member function a) has a default argument; b) returns a pointer value. Here is my related C++ code: ---------------------------------------------- class Number { public: Number(int n); Number* copy(int n = 100); }; Number* Number::copy(int n) { printf("number of copies = %d\n", n); return this; } BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(copy_overloads, copy, 0, 1); BOOST_PYTHON_MODULE(numbermod) { python::class_<Number> number_class("Number", python::init<int>()); number_class.def("copy", &Number::copy, python::return_internal_reference<>(), copy_overloads()); } ---------------------------------------------- python code: ---------------------------------------- from numbermod import * n = Number(10) n1 = n.copy() ---------------------------------------- error message: ---------------------------------------- Traceback (most recent call last): File "./test.py", line 19, in ? n1 = n.copy() TypeError: bad argument type for built-in operation Can anyone please tell me what's wrong? Thanks. Liwei __________________________________________________ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site http://webhosting.yahoo.com/