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The classic article about virtuality from Herb Sutter [1] suggests that
virtual functions are always private and public class interface is never
virtual. Until now, it was not really possible to document these
functions in Doxygen:
* Enabling EXTRACT_PRIVATE would show all internals, not just virtual
functions, which is not wanted.
* Enabling HIDE_UNDOC_MEMBERS and HIDE_UNDOC_CLASSES would effectively
disable warnings about *all* undocumented members, which is not wanted.
The usual workaround was to put the members into protected scope just
for Doxygen:
#ifdef DOXYGEN_GENERATING_OUTPUT
protected:
#else
private:
#endif
/** @brief Documented private virtual function */
virtual doStuff();
The new EXTRACT_PRIVATE_VIRTUAL option makes these visible (and able to
be linked to), but shows them *only* if they are documented.
[1] http://www.gotw.ca/publications/mill18.htm
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