Sorry if this one hits a little close to home.
Source https://www.learncpp.com/cpp-tutorial/friend-classes-and-friend-member-functions/
Sorry if this one hits a little close to home.
Source https://www.learncpp.com/cpp-tutorial/friend-classes-and-friend-member-functions/
No, first is reciprocity, second is same level of transience while the third is inheritance.
The first note says that A->B doesn’t imply B->A
The second note says that if A->B and B->C, nothing implies that A->C or C->A.
The third note says that people that consider you a friend don’t automatically consider your kids friends. In logic terms B->A doesn’t imply B->An.