Possible Duplicate:
Public virtual function derived private in C++
class B
{
private:
int b;
public:
B(int i);
virtual void show()
{
cout<<"B::show()called. "<<b<<endl;
}
};
B::B(int i=0)
{
b=i;
}
class D:public B
{
private:
int d;
void show()
{
cout<<"D::show() called. "<<d<<endl;
}
public:
D(int i, int j);
};
D::D(int i=0, int j=0):B(i)
{
d=j;
}
void fun(B&obj)
{
obj.show();
}
/*if I redefine fun() as follow, the result would be the same
void fun(B*obj)
{
obj->show();
}
*/
int main()
{
D *pd=new D(5,8);
fun(*pd); //K
delete pd;
}
The output of the program is "D::show() called.", which means the virtual function declared in the private part of class D is invoked. Don't you think it weird? How could a private member of a class be accessed from outside?