Constructor forest<T>() (1) (defaulted) forest<T>(const forest<T> & x) (2) forest<T>(forest<T> && x) (3) (1) forest<T>() (defaulted) Default ctor (2) forest<T>(const forest<T> & x) Copy ctor Parameters const forest<T> & x (3) forest<T>(forest<T> && x) Move ctor Parameters forest<T> && x