How to make sure every data members of a class have been copied in its copy constructor?

Question

When a class has many data members, it is hard to figure out whether a data member is copied or not in its copy constructor.

Is there a solution?

Answer 1

A simple solution is to make sure every member type is copyable, and that there are e.g. no pointers to self or other pointers or references that require fix-ups. Then the generated copy-constructor is good enough.