Inheritance and friendship
In C++, friendship is not inherited. If a base class has a friend function, then the function doesn’t become a friend of the derived class(es).
For example, following program prints error because show() which is a friend of base class A tries to access private data of derived class B.
#include <iostream>using namespace std; class A{ protected: int x; public: A() { x = 0;} friend void show();}; class B: public A{ public: B() : y (0) {} private: int y; }; void show(){ B b; cout << "The default value of A::x = " << b.x; // Can't access private member declared in class 'B' cout << "The default value of B::y = " << b.y;} int main(){ show(); getchar(); return 0;} |
Thanks to Venki for the above code and explanation.
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