491 struct ConstructorTracker {  struct
492   static size_t constructor_called;
493   static size_t copy_constructor_called;
494   static size_t move_constructor_called;
495   static size_t copy_assignment_called;
496   static size_t move_assignment_called;
499   ConstructorTracker(T&& string) : string(string) {  in ConstructorTracker()  argument
503   ConstructorTracker(const ConstructorTracker& ct) {  in ConstructorTracker()  function
507   ConstructorTracker(ConstructorTracker&& ct) noexcept {  in ConstructorTracker()  argument
511   ConstructorTracker& operator=(const ConstructorTracker& ct) {  in operator =()
516   ConstructorTracker& operator=(ConstructorTracker&& ct) noexcept {  in operator =()
522   std::string string;