c++11 实现枚举值到枚举名的转换问题

ENUM_DEFINE ( Color,
    Red,
    Blue,
)

EnumHelper(Color::Red) -> "Red"
EnumHelper(Color::Red, std::toupper) -> "RED"

#define XXX(type, ...) enum class type { __VA_ARGS__ };

enum class Color
{
    Red,
    Blue
};

#define XXX(type, ...) #__VA_ARGS__

const int temp = initialize();

template<typename T>
string EnumHelper(T key, const std::function<char(char)> processor = nullptr, const char* pszName = NULL)
{
    static_assert(std::is_enum_v<T>, __FUNCTION__ "'s key need a enum");

    static map<T, string> s_mapName;
    if (nullptr != pszName)
    {
        s_mapName[key] = pszName;
    }
    std::string res = "";
    auto it = s_mapName.find(key);
    if (it != s_mapName.end())
        res = it->second;
    if (nullptr != processor)
        std::transform(res.begin(), res.end(), res.begin(), processor);
    return res;
}
template <class T>
size_t analystEnum(T enumClass, const char* pszNames)
    static_assert(std::is_enum_v<T>, __FUNCTION__ "'s enumClass need a enum");
    cout << "analystEnum: " << pszNames << endl;
    if (nullptr != pszNames)
        const vector<string>& vecName = split(pszNames, ",");
        for (int i = 0; i < vecName.size(); ++i)
        {
            if (vecName.at(i).size() > 0)
            {
                EnumHelper((T)(i + 1), nullptr, vecName.at(i).c_str() + (i == 0 ? 0 : 1) );
            }
        }
        return rand();
    return rand();
#define ENUM_DEFINE(type, ...) enum class type { placeholder, __VA_ARGS__ }; static const size_t g_uEnumSizeOf##type = analystEnum(type::placeholder, #__VA_ARGS__);