[Bug c++/58407] [C++11] Should warn about deprecated implicit generation of copy constructor/assignment

[akrzemi1 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58407

--- Comment #25 from Andrzej Krzemienski <akrzemi1 at gmail dot com> ---
(In reply to Allan Jensen from comment #24)
> So with this the rule-of-three is now the rule-of-four or six?

The Rule of Zero: https://blog.rmf.io/cxx11/rule-of-zero