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While I’ve seen rare cases where private inheritance was needed, I’ve never encountered a case where protected inheritance is needed. Does someone have an example?
People here seem to mistake Protected class inheritance and Protected methods.
FWIW, I’ve never seen anyone use protected class inheritance, and if I remember correctly I think Stroustrup even considered the ‘protected’ level to be a mistake in c++. There’s precious little you cannot do if you remove that protection level and only rely on public and private.