https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102229
--- Comment #7 from Net Can <netcan1996 at gmail dot com> --- here is my use case: https://github.com/netcan/config-loader/blob/master/include/config-loader/serialize/TypeSerializer.h the key is ```c++ #define TYPE_SERIALIZER(_type, _typeName) \ struct TypeSerializer<PARE _type> \ { static constexpr decltype(auto) name = _typeName; } template<> TYPE_SERIALIZER((int8_t), "int8_t"); // (1) template<typename T> TYPE_SERIALIZER((std::vector<T>), concat("vector<", TypeSerializer<T>::name, ">")); // (2) ``` in case (1), the `name` type is `const char(&)[N]`, but in case(2), the `name` type is `array[N]`, so I use `decltype(auto)` rather `auto`, becase latter loses char length info. I tried `static decltype(auto)` not work because it is defined in class, and requires `constexpr`.
