E2166 Destructor for 'class' is not accessible (C++)

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The destructor for this C++ class is protected or private, and can't be accessed here to destroy the class.

If a class destructor is private, the class can't be destroyed, and thus can never be used. This is probably an error.

A protected destructor can be accessed only from derived classes.

This is a useful way to ensure that no instance of a base class is ever created, but only classes derived from it.