C++编译期生成枚举唯一标识

#include <string_view>
namespace LoginModule {
struct LoginManager {
    enum class LoginMsg {
        LOGIN,
        LOGOUT,
    };
};
}
enum class RunMsg {
    NEW_RUN,
    LOAD_RUN,
    DEL_RUN,
};

template<char... chars>
static constexpr const char staticString[] = { chars... };

template <auto E, typename = std::enable_if_t<std::is_enum_v<decltype(E)>>>
constexpr auto GetEnumIdentity() {
    constexpr std::string_view signature = __FUNCSIG__;
    constexpr auto enumName = signature.substr(signature.find_first_of('<') + 1,
        signature.find_last_of(':') - signature.find_first_of('<') - 2);
    constexpr auto enumValue = static_cast<char>(E);
    constexpr auto identity = []<std::size_t...seqIdx>(std::index_sequence<seqIdx...>) {
        return staticString<enumName[seqIdx]..., enumValue, '\0'>;
    }(std::make_index_sequence<enumName.size()>{});
    return identity;
}

template <typename T, typename = std::enable_if_t<std::is_enum_v<T>>>
constexpr auto GetEnumIdentity(T t) {
    constexpr const char* signature = __FUNCSIG__;
    return signature + static_cast<int>(t);
}

int main()
{
    constexpr const char* enumId0 = GetEnumIdentity<RunMsg::DEL_RUN>();
    constexpr const char* enumId1 = GetEnumIdentity(LoginModule::LoginManager::LoginMsg::LOGIN);
    constexpr const char* enumId2 = GetEnumIdentity(LoginModule::LoginManager::LoginMsg::LOGOUT);
    constexpr const char* enumId3 = GetEnumIdentity(RunMsg::NEW_RUN);
    constexpr const char* enumId4 = GetEnumIdentity(RunMsg::LOAD_RUN);
    constexpr const char* enumId5 = GetEnumIdentity(RunMsg::DEL_RUN);
}