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Document number: N3839

Date: 2014-01-01

Proposing the Rule of Five, v2

by Walter E. Brown

Excerpt:

C++11 provided that a class’s copy functions may be implicitly declared and, if needed, implicitly defined as either deleted or defaulted, depending on the circumstances. At the same time, C++11 deprecated some of those circumstances. This paper proposes to obsolete this deprecated behavior, leaving us with the very teachable “rule of five” that no copy function, move function, or destructor will be compiler-generated if any of these functions is user-provided.