Py::Object
_path_module::count_bboxes_overlapping_bbox(const Py::Tuple& args)
{
    args.verify_length(2);

    Py::Object              bbox   = args[0];
    Py::SeqBase<Py::Object> bboxes = args[1];

    double ax0, ay0, ax1, ay1;
    double bx0, by0, bx1, by1;
    long count = 0;

    if (py_convert_bbox(bbox.ptr(), ax0, ay0, ax1, ay1))
    {
        if (ax1 < ax0)
        {
            std::swap(ax0, ax1);
        }
        if (ay1 < ay0)
        {
            std::swap(ay0, ay1);
        }

        size_t num_bboxes = bboxes.size();
        for (size_t i = 0; i < num_bboxes; ++i)
        {
            Py::Object bbox_b = bboxes[i];
            if (py_convert_bbox(bbox_b.ptr(), bx0, by0, bx1, by1))
            {
                if (bx1 < bx0)
                {
                    std::swap(bx0, bx1);
                }
                if (by1 < by0)
                {
                    std::swap(by0, by1);
                }
                if (!((bx1 <= ax0) ||
                      (by1 <= ay0) ||
                      (bx0 >= ax1) ||
                      (by0 >= ay1)))
                {
                    ++count;
                }
            }
            else
            {
                throw Py::ValueError("Non-bbox object in bboxes list");
            }
        }
    }
    else
    {
        throw Py::ValueError("First argument to count_bboxes_overlapping_bbox must be a Bbox object.");
    }

    return Py::Int(count);
}