[C++-sig] Retrieving lvalues using custom converters (numpy 1-D converters attached)

[Neal Becker]

OK, got it!  But, I needed to add simple_const_iter for const_iterator.  Then, this works:
,----[ /home/nbecker/numpy.new/num.cc ]
| #include "numpy.h"
| #include <boost/python/module.hpp>
| #include <boost/python/def.hpp>
| #include <numeric>
| 
| namespace ublas=boost::numeric::ublas;
| using namespace boost::python;
| 
| double do_sum (ublas::vector<double,
| numpy::detail::numpy_storage_array<double> > const& u) {
|   return std::accumulate (u.begin(), u.end(), 0.0);
| }
| 
| 
| BOOST_PYTHON_MODULE (num) {
|   import_array();
|   numpy::register_ublas_from_python_converters();
|   numpy::register_default_ublas_to_python();
|   def ("do_sum", &do_sum);
| }
`----