Human Folly about “Rule-of-Three”

Rule of three (en.cppreference.com):
The current #C++ "rule of three".
on 02017-07-17
(drdobbs.com):
The details of the #C++ #Rule-of-Three (as of 2001, before move semantics), by Koenig and Barbara Moo.
on 02017-07-17