unique_ptr, shared_ptr, weak_ptr или reference_wrapper для отношений классов.
https://www.nextptr.com/tutorial/ta1450413058/unique_ptr-shared_ptr-weak_ptr-or-reference_wrapper-for-class-relationships
https://www.nextptr.com/tutorial/ta1450413058/unique_ptr-shared_ptr-weak_ptr-or-reference_wrapper-for-class-relationships