Enum with underlying char not supported in 2.3.0?

[bwlee]

Just upgrade from 2.2.4 to 2.3.0, nothing else changed, but got error when import package in python as below

libc++abi.dylib: terminating with uncaught exception of type pybind11::error_already_set: TypeError: __int__ returned non-int (type str)

it seems enum definition not supported. eg.

enum class A: char { First='1', Second = '2', }

[bwlee]

Hi, I have tried a work-around by modify method "int" in pybind11.h

@line 1555 ~ 1558

        def("__int__", [](Type value) { return int(static_cast<Scalar>(value)); });
        #if PY_MAJOR_VERSION < 3
            def("__long__", [](Type value) { return long(static_cast<Scalar>(value)); });
        #endif

but it smells not well.

Is there any better solutions? @wjakob

[wojdyr]

I've also spotted it when upgrading to 2.3.0.
But the only problem I came across was using such enums as a default arg.
For example:

#include <pybind11/pybind11.h>
namespace py = pybind11;

enum class X : char { X1, X2 };
bool foo(X x) { return x == X::X1; }

PYBIND11_MODULE(example, m) {
    py::enum_<X>(m, "X").value("X1", X::X1).value("X2", X::X2);
    m.def("foo", &foo, py::arg("x")=X::X1);
}

In my case the simplest workaround is to change char to signed char (or unsigned char).