How to expose std::vector<int> as a Python list using SWIG?

Question

I'm trying to expose this function to Python using SWIG:

std::vector<int> get_match_stats();

And I want SWIG to generate wrapping code for Python so I can see it as a list of integers.

Adding this to the .i file:

%include "typemaps.i"
%include "std_vector.i"

namespace std
{
  %template(IntVector) vector<int>;
}

I'm running SWIG Version 1.3.36 and calling swig with -Wall and I get no warnings.

I'm able to get access to a list but I get a bunch of warnings when compiling with -Wall (with g++ (GCC) 4.2.4 ) the generated C++ code that say:

  warning: dereferencing type-punned pointer will break strict-aliasing rules

Am I exposing the function correctly? If so, what does the warning mean?

Answer 1

%template(IntVector) vector<int>;

Answer 2

I don't have much experience with Swig, but are you #including your C++ header file in your .i file? Try one (or both) of

%include "myvector.h"


%{
#   include "myvector.h"
%}