python - How to use SWIG to wrap a C++ operator[] in a template class inside a namespace? -

i'm using swig wrap existing c++ library using header files. library uses namespace , template class create arrays of custom objects. i'm running problems trying wrap subscript operator (operator[]) used access elements inside wrapped arrays. swig tells me operator[] ignored , should use %extend instead:

small.i:18: warning 389: operator[] ignored (consider using %extend) 

so i'm trying use extend no matter syntax i've tried, can't inserted code show in _wrap.cxx file. here's swig input file:

%module tltest %{ ... %}  namespace nite {     template <class t> class array {     public:         %rename(__getitem__) operator[];         const t& operator[](int index) const {return m_data[index];}          %rename(__len__) getsize;         int getsize() const {return m_size;}     };      class userdata : private niteuserdata     {     public:     };      %template(userdataarray) array<userdata>;  };  %extend array<userdata> {     userdata& __getitem__(unsigned int i) {         return $self[i];      } } 

i know want define __getitem__ function python able index array class. note __len__ function renamed correctly, , works python interface.

however, %extend block added define __getitem__ call not ever seem injected small_wrap.cxx wrapper file. can see i'm doing wrong?

aha! discovered need qualify types using namespace in %extend block, follows:

%extend nite::array<nite::userdata> {     nite::userdata __getitem__(unsigned int i) {         return (*($self))[i];     } }