[C++-sig] problem with iterator and non-destructible container

[James Pelletier]

I'm having trouble wrapping a container object that has a private 
destructor. As far as I can tell, the object has all of the necessary 
data to be used with the boost::python::iterator object, but when I try 
to compile I get an error message saying that the container's destructor 
is private. Why would the iterator want to destroy my container? Am I 
missing something?

I'm using gcc-3.4 on solaris 10 on intel and boost-1.32.  I couldn't 
find any differences in header files between boost 1.32 and 1.33 in this 
area.

I've whittled it down to a small example below that gives me the same 
error message.
The code compiles cleanly if I take out the .def("__iter__"...) line.

-------

#include <vector>
#include <boost/python.hpp>

using namespace boost::python;

class Y
{
	Y() {}
	~Y() {}

	Y( Y const & );
	Y & operator=( Y const & );

	std::vector<int> v_;
public:
	typedef std::vector<int>::const_iterator const_iterator;
	const_iterator begin() const { return v_.begin(); }
	const_iterator end() const { return v_.end(); }
};

BOOST_PYTHON_MODULE(boostpy)
{
	class_<Y, boost::noncopyable>("Y", no_init)
		.def( "__iter__", iterator<Y const>() )
		;
}

------

test.C: In static member function `static void 
boost::python::detail::value_destroyer< false>::execute(const volatile 
T*) [with T = Y]':
/opt/app/g++lib6/boost-1.32/include/boost-1_32/boost/python/detail/destroy.hpp:90: 
   instantiated from `void 
boost::python::detail::destroy_referent_impl(void*, T&(*)()) [with T = 
const Y]'
/opt/app/g++lib6/boost-1.32/include/boost-1_32/boost/python/detail/destroy.hpp:101: 
   instantiated from `void 
boost::python::detail::destroy_referent(void*, T (*)()) [with T = const Y&]'
/opt/app/g++lib6/boost-1.32/include/boost-1_32/boost/python/converter/rvalue_from_python_data.hpp:135: 
   instantiated from 
`boost::python::converter::rvalue_from_python_data<T>::~rvalue_from_python_data() 
[with T = const Y&]'
/opt/app/g++lib6/boost-1.32/include/boost-1_32/boost/preprocessor/iteration/detail/local.hpp:34: 
   instantiated from `PyObject* 
boost::python::detail::caller_arity<1u>::impl<F, Policies, 
Sig>::operator()(PyObject*, PyObject*) [with F = 
boost::python::objects::detail::py_iter_<const Y, 
__gnu_cxx::__normal_iterator<const int*, std::vector<int, 
std::allocator<int> > >, 
boost::_bi::protected_bind_t<boost::_bi::bind_t<__gnu_cxx::__normal_iterator<const 
int*, std::vector<int, std::allocator<int> > >, 
__gnu_cxx::__normal_iterator<const int*, std::vector<int, 
std::allocator<int> > > (*)(const Y&), boost::_bi::list1<boost::arg<1> > 
 > >, 
boost::_bi::protected_bind_t<boost::_bi::bind_t<__gnu_cxx::__normal_iterator<const 
int*, std::vector<int, std::allocator<int> > >, 
__gnu_cxx::__normal_iterator<const int*, std::vector<int, 
std::allocator<int> > > (*)(const Y&), boost::_bi::list1<boost::arg<1> > 
 > >, boost::python::return_value_policy<boost::python::return_by_value, 
boost::python::default_call_policies> >, Policies = 
boost::python::default_call_policies, Sig = 
boost::mpl::vector2<boost::python::objects::iterator_range<boost::python::return_value_policy<boost::python::return_by_value, 
boost::python::default_call_policies>, 
__gnu_cxx::__normal_iterator<const int*, std::vector<int, 
std::allocator<int> > > >, boost::python::back_reference<const Y&> >]'
/opt/app/g++lib6/boost-1.32/include/boost-1_32/boost/python/object/py_function.hpp:38: 
   instantiated from `PyObject* 
boost::python::objects::caller_py_function_impl<Caller>::operator()(PyObject*, 
PyObject*) [with Caller = 
boost::python::detail::caller<boost::python::objects::detail::py_iter_<const 
Y, __gnu_cxx::__normal_iterator<const int*, std::vector<int, 
std::allocator<int> > >, 
boost::_bi::protected_bind_t<boost::_bi::bind_t<__gnu_cxx::__normal_iterator<const 
int*, std::vector<int, std::allocator<int> > >, 
__gnu_cxx::__normal_iterator<const int*, std::vector<int, 
std::allocator<int> > > (*)(const Y&), boost::_bi::list1<boost::arg<1> > 
 > >, 
boost::_bi::protected_bind_t<boost::_bi::bind_t<__gnu_cxx::__normal_iterator<const 
int*, std::vector<int, std::allocator<int> > >, 
__gnu_cxx::__normal_iterator<const int*, std::vector<int, 
std::allocator<int> > > (*)(const Y&), boost::_bi::list1<boost::arg<1> > 
 > >, boost::python::return_value_policy<boost::python::return_by_value, 
boost::python::default_call_policies> >, 
boost::python::default_call_policies, 
boost::mpl::vector2<boost::python::objects::iterator_range<boost::python::return_value_policy<boost::python::return_by_value, 
boost::python::default_call_policies>, 
__gnu_cxx::__normal_iterator<const int*, std::vector<int, 
std::allocator<int> > > >, boost::python::back_reference<const Y&> > >]'
test.C:37:   instantiated from here
test.C:10: error: `Y::~Y()' is private
/opt/app/g++lib6/boost-1.32/include/boost-1_32/boost/python/detail/destroy.hpp:33: 
error: within this context