Method ThreadExitNotifier

include/dmlc/concurrentqueue.h:536–536

  private:
    ThreadExitNotifier() : tail(nullptr) { }
    ThreadExitNotifier(ThreadExitNotifier const&) MOODYCAMEL_DELETE_FUNCTION;
    ThreadExitNotifier& operator=(ThreadExitNotifier const&) MOODYCAMEL_DELETE_FUNCTION;