private static void TestEnumUnmanagedCallersOnly()
    {
        StdCallMemberFunctionNative.C c      = CreateCWithUnmanagedCallersOnlyVTable(2.0f, 3.0f);
        StdCallMemberFunctionNative.E result = StdCallMemberFunctionNative.GetEFromManaged(&c);

        Assert.AreEqual(c.dummy, result);
    }
    private static void TestEnum(StdCallMemberFunctionNative.C *instance)
    {
        StdCallMemberFunctionNative.E result = instance->vtable->getE(instance);

        Assert.AreEqual(instance->dummy, result);
    }