[Swig-user] nested class in std::vector

[Dieter V. <dva...@ax...>]

Hi, i've run into a problem when trying to iterate (in Python) over a
proxy of a vector containing a C++ class that is nested in another
class.

Here's the example:

/* InnerOuter.h"/
#include <vector>

class Outer { 
   public:
      class Inner { 
         public:
            double v_;
            Inner(double v = 0.0): v_(v) {}
      };

      std::vector<Inner> getSomeInners() { 
         std::vector<Inner> result;
         result.push_back(Inner(1.0));
         result.push_back(Inner(2.0));
         return result;
      };
};

/* InnerOuter.i*/
%module innerouter

%include stl.i

%feature("autodoc", "1");

%{
#include <vector>
#include "InnerOuter.h"
%}

namespace std {
   %template(VectorInner) vector<Outer::Inner>;
};

class Inner {
   public:
      double v_;
      Inner(double v);
};

%{
typedef Outer::Inner Inner;
%}

class Outer {
   public:
      std::vector<Inner> getSomeInners();
};

When i run the following python code:
from innerouter import *

x = Outer()
z = x.getSomeInners()

for y in z:
   print y.v_

#for i in xrange(len(z)):
#   print z[i].v_

I get this error:
Traceback (most recent call last):
  File "mytest.py", line 7, in <module>
    print y.v_
AttributeError: 'SwigPyObject' object has no attribute 'v_'
swig/python detected a memory leak of type 'unknown', no destructor
found.

Running the commented code works fine, so i have a workaround, but 
i thought this might be a helpful test case.  I know nested classes are
not fully supported, so i can understand if it is nontrivial to resolve
this.

thanks
dieter