How to bind a method which takes std::error_code as a reference argument?

[finger563]

I'm trying to bind a method which takes a std::error_code& argument, similar to the alternate paradigm some stl methods provide which are noexcept.

The binding / build works fine, but at runtime in python I'm getting

Traceback (most recent call last):
  File "/Users/bob/backbone/niji/pyniji/usb_profile_test.py", line 226, in <module>
    niji_profile_test(niji_device, args.erase)
  File "/Users/bob/backbone/niji/pyniji/usb_profile_test.py", line 44, in niji_profile_test
    profile_bytes = profile_parser.serialize(profile)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: serialize(): incompatible function arguments. The following argument types are supported:
    1. (self: niji.GamepadProfileParser, profile: niji.GamepadProfile, ec: std::__1::error_code) -> list[int]

Invoked with: <niji.GamepadProfileParser object at 0x105c1e7b0>, GamepadProfile(uuid: d14629a87c0d495b, name: Python Profile)

Did you forget to `#include <pybind11/stl.h>`? Or <pybind11/complex.h>,
<pybind11/functional.h>, <pybind11/chrono.h>, etc. Some automatic
conversions are optional and require extra headers to be included
when compiling your pybind11 module.

I am including the following:

#include <pybind11/pybind11.h>

#include <pybind11/stl.h>

#include <pybind11/chrono.h>
#include <pybind11/functional.h>

I've looked through the docs and the code at https://github.com/pybind/pybind11/tree/master/include/pybind11 but I'm not finding any additional includes that I might be missing which would make sense.

[finger563]

Figured it out, had to expose Error class which wrapped std::error_code:

    // create an Error class which is really just std::error_code
    py::class_<std::error_code>(m, "Error")
        .def(py::init<>())
        .def("__repr__", [](const std::error_code &self) {
            return fmt::format("Error({})", self.message());
        });