Passing Python list to C++ vector using Boost.python

Question

How do I pass a Python list of my object type ClassName to a C++ function that accepts a vector?

The best I found is something

Answer 1

Assuming you have function that takes a std::vector<Foo>

void bar (std::vector<Foo> arg)

The easiest way to handle this is to expose the vector to python.

BOOST_PYTHON_MODULE(awesome_module)
{
    class_<Foo>("Foo")
        //methods and attrs here
    ;

    class_<std::vector<Foo> >("VectorOfFoo")
        .def(vector_indexing_suite<std::vector<foo> >() )
    ;

    .def("bar", &bar)
}

So now in python we can stick Foos into a vector and pass the vector to bar

from awesome_module import *
foo_vector = VectorOfFoo()
foo_vector.extend(Foo(arg) for arg in arglist)
bar(foo_vector)

Answer 2

Found an iterator that solves my problem:

#include <boost/python/stl_iterator.hpp>
template<typename T>
void python_to_vector(boost::python::object o, vector<T>* v) {
    stl_input_iterator<T> begin(o);
    stl_input_iterator<T> end;
    v->clear();
    v->insert(v->end(), begin, end);
}