[C++-sig] Problem accessing bp::list attributes in C++

[christophe grimault]

Hi,

I wrote a function to speedup a part of my Python code that manipulates
python list objects. I do stg like:

void  Foo(numeric::array& X, numeric::array& Y, bool flag, list
max_points, list min_points,
		                    list left_max_points, list right_max_points){
    ...
    ...
    int Lmax =
boost::python::extract<int>(max_points.attr("__len__")());
    ...
    ...
}

It compiles, but it crashes with segmentation fault, at the line where I
try get the length of max_points, 
which is a list.

I don't understand why !

any help ?

Thanks in advance

Chris
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