[C++-sig] Problem with boost::python::iterator

[Pierre Barbier de Reuille]

I use boost::python::iterator to export a python iterator from STL
containers. More precisely, I use :

  .def("__iter__", boost::python::iterator<Container>())

where Container is a STL container ( vector<foo> for example ). Let's
say that foo is a class that contains an integer 'a'. My problem is with
this following test:

>>> l = vector_foo()
>>> l.append(foo(3))
>>> l.append(foo(2))
>>> l.append(foo(10))
>>> print l
vector_foo{ foo(3), foo(2), foo(10) }
>>> for i in l:
...   i.a = i.a + 3
...
>>> print l
vector_foo{ foo(3), foo(2), foo(10) }

I don't understand !!! It used to work, but it does not anymore ! If you
replace the variable (defined as readwrite) by a function call modifying
the object it does not modify the vector !

This is a very big problem for me !!! What can I do ?

Thanks,

-- 
Pierre Barbier de Reuille

INRA - UMR Cirad/Inra/Cnrs/Univ.MontpellierII AMAP
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