class base {
        public:
            virtual void doSomething() = 0;
    };

    class derived : public base {
        **private:**
            virtual void doSomething(){cout<<"Derived fn"<<endl;}
    };

now if i do the following:

 base *b=new child;
    b->doSomething(); //it calls the derived class fn even if that is private.

Question: 1.its able to call the derived class fn even if that is private.How is it possible?

Now if i change the inheritance access specifier from public to protected/private then i get compilation error as "'type cast' : conversion from 'Derived *' to 'base *' exists, but is inaccessible"

Notes: I am aware on the concepts of the inheritance access specifiers.So in second case as its derived private/protected, its inaccessible. But here it confuses me for the first question. Any input will be highly appreciated