Equivalent of boost::python::stl_input_iterator<>()

[efifogel]

Hi,

I'm looking for an elegant replacement of boost::python::stl_input_iterator<>() in nanobind.
I'm porting a large code base that provides wrappers for the CGAL library.

An example of the existing code follows

namespace py = boost::python;
Polygon_2* init_from_list(py::list& lst) {
  auto begin = py::stl_input_iterator<Point_2>(lst);
  auto end = py::stl_input_iterator<Point_2>();
  return new Polygon_2(begin, end);
}

Both, Polygon_2 and Point_2 types are wrapped via the class_ construct.

As you can see, the Polygon_2 class has a constructor that accepts a (begin,end) pair.
It also supports the default constructor and a .push_back() method, so the code above can be converted to:

namespace py = nanobind;
Polygon_2* init_from_list(py::list& lst) {
  auto* pgn = new Polygon_2();
  for (auto it = lst.begin(); it != lst.end(); ++it) {
    const auto& p = py::cast<const Point_2&>(*it);
    pgn.push_back(p);
  }
  return pgn;
}

Naturally, it is possible to implement an input iterator equivalent of stl_input_iterator<>(), but I wonder whether there already exists an elegant replacement.

Thanks,
Efi

[efifogel]

In the meantime, is it possible to add a default constructor for detail::fast_iterator?