Avoid "auto" as the return type of a member function if its immediate resolution is a template parameter. Or explicitly instantiate the class or function. In the given test case, there's a variable defined with type EventSubscriberTable<int>. To avoid the problem, then, include either     template class EventSubscriberTable<int>; or     template auto EventSubscriberTable<int>::getBroadcastList(void); in the source file.

Given a class definition like template <typename T> class Table { public :   auto getList(void) { return m_Callbacks; } private :   T m_Callbacks; }; where the member function getList() returns "auto" and that "auto" can be seen to be "T", and this program: int main(int argc, char* argv[]) {     Table<int> m_Table;     return 0; } in which the Table class is instantiated but the function getList() is never used, the compiler may crash. The problem requires the combination of auto, template parameter, and uninstantiated function. Changing any of those details will avoid it.