Inheritance: 'A' is an inaccessible base of 'B'

Question

$ cat inheritance.cpp 
#include 

using namespace std;

class A { };
class B : private A { };

int main() {
    A* ab = new B;
}
$
$ g++ inheritance.         


        

Answer 1

Private inheritance means that outside the derived class, the inheritance information is hidden. That means you can't cast the derived class to the base class: the relationship isn't known to the caller.