non-public inheritance

Question

why no one question about non-public inheritance?

Answer 1

Public inheritance: Public members of the base class become public members of the derived class and protected members of the base class become protected members of the derived class.

Protected inheritance: Public and protected members of the base class become protected members of the derived class.

Private inheritance: Public and protected members of the base class become private members of the derived class.

You probably won't ever need to use anything but public inheritance.

Answer 2

this can be used not so often, but I'm facing with it (private only, no one protected) from time to time. here is a perfect sample from guru :) http://www.gotw.ca/gotw/040.htm