enum TestEnum
{
    ENUM_VALUE_1 = 1,
    ENUM_VALUE_2 = 2,
    ENUM_VALUE_3 = 3
};

struct TestCases
{
    void test_08(TestEnum& e)
    {
        std::cout << "TestEnum& e = " << e << std::endl; 
    }
    
    void test_09(TestEnum* e)
    {
        std::cout << "TestEnum* e = " << *e << std::endl;
    }
};

error C2664: 'void TestCases::test_08(TestEnum &)': cannot convert argument 1 from 'TestEnum *' to 'TestEnum &'

    // Call function/method
    {
        ::TestEnum *cppArg0;
        pythonToCpp(pyArg, &cppArg0);

            if (!PyErr_Occurred()) {
            // test_08(TestEnum&)
            cppSelf->test_08(cppArg0);  // <--- test_08 accepts a reference
        }
    }

cppSelf->test_08(*cppArg0);

    // Call function/method
    {
        ::TestEnum *cppArg0;
        pythonToCpp(pyArg, &cppArg0);

            if (!PyErr_Occurred()) {
            // test_09(TestEnum*)
            cppSelf->test_09(cppArg0);
        }
    }

        pythonToCpp(pyArg, cppArg0);