Rule of Zero

Interesting take on the need or otherwise to write move constructors by R. Martinho Fernandes (Flaming Dangerzone) :-

So, we have arrived at the Rule of Zero (which is actually a particular instance of the Single Responsibility Principle):

Classes that have custom destructors, copy/move constructors or copy/move assignment operators should deal exclusively with ownership. Other classes should not have custom destructors, copy/move constructors or copy/move assignment operators.

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