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

[Neal Becker]

This is very interesting!  But how do I use it?

What I tried:
your numpy.h (but comment out)
 #ifndef IN_FILE_IMPORTING_ARRAY
 #define NO_IMPORT_ARRAY
 #endif
 #define PY_ARRAY_UNIQUE_SYMBOL Wicket_Numpy

My code:
,----[ /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> 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);
| }
`----
,----[ /home/nbecker/numpy.new/test_num.py ]
| from num import *
| from numpy import *
| 
| u = array (xrange(10), dtype=float64)
| v = do_sum (u)
`----

Seems the converters didn't work:
ArgumentError: Python argument types in
    num.do_sum(numpy.ndarray)
did not match C++ signature:
    do_sum(boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double, std::allocator<double> > >)