Issues with push_back in Opaque Wrapper for STL Containers in Pybind11

[rameshdange5191]

I made an opaque wrapper because https://pybind11.readthedocs.io/en/stable/advanced/cast/stl.html#making-opaque-types

I get no errors. But still push_back does not work entirely. I face the same issues as discussed in the first link. The required lines are as follows:

PYBIND11_MAKE_OPAQUE(std::vector<double, std::allocator<double>>);
PYBIND11_MAKE_OPAQUE(std::vector<std::vector<double>, std::allocator<std::vector<double>>>);

using vec_doub_lis = std::vector<double, std::allocator<double>>;
using vec_vec_doub_lis = std::vector<std::vector<double>, std::allocator<std::vector<double>>>;

.def("push_back", (void (vec_doub_lis::*)(const double&)) &vec_doub_lis::push_back)

.def("push_back", (void(vec_vec_doub_lis::*)(const std::vector<double> &)) &vec_vec_doub_lis::push_back)

The source code from which I wrote the above can be found at: https://github.com/pybind/pybind11/blob/master/tests/test_opaque_types.cpp
Its required portions are:

PYBIND11_MAKE_OPAQUE(std::vector<std::string, std::allocator<std::string>>);
using StringList = std::vector<std::string, std::allocator<std::string>>;

py::class_<StringList>(m, "StringList")
        .def(py::init<>())
        .def("pop_back", &StringList::pop_back)
        /* There are multiple versions of push_back(), etc. Select the right ones. */
        .def("push_back", (void(StringList::*)(const std::string &)) & StringList::push_back)

I also asked on gitter. These are the links:
https://matrix.to/#/!vYqYcTzqekPEfQIxEf:gitter.im/$QgV4ba0NXRhZFEgoeaoHiwuLskewD4UK0QQSo-5OWEk?via=gitter.im&via=matrix.org
https://matrix.to/#/!vYqYcTzqekPEfQIxEf:gitter.im/$0hs-KRBBye8PGp-Jtrg4gyVDYpxFJJw5L_HRNNvMUUA?via=gitter.im&via=matrix.org