'*(std::function<bool(wchar_t)>*)((char*)&__tmp + offsetof(std::__detail::_StateT, std::__detail::_State<wchar_t>::<unnamed>.std::__detail::_State_base::<unnamed>)).std::function<bool(wchar_t)>::_M_invoker' may be used uninitialized [-Wmaybe-uninitialized]