CS202 4- ‹#›
nWe can force application programs to always use pointers to base class objects instead of using pointers
to derived class objects or using
objects directly by making the
overridden member functions protected or private in the derived classes.
nThis is a way to force
applications to adhere to the defined
interface provided by the base class and to help ensure that dynamic binding will be used.
nIt causes compilation
errors to result if the application attempts
to use static binding:
student* ps = &smith;
ps->statement(); //illegal access-protected member
smith.statement(); //illegal
access-protected member
Making sure pointers are used