The final base class is new to the series.

Advanced classes share the same storyline as their base class.

This is a common problem, particularly when a user goes to modify the base class.

This can cause the library to collapse like a house of cards as many classes are damaged by one change to a base class.

A class defined with the keyword has private members and base classes by default.

To elaborate on the above example, consider a base class with no virtual functions.

For example, a base class could have a virtual function .

Inheritance from a base class may be declared as public, protected, or private.

This allows for new derived types to be introduced with no change to the code that uses the base class.

Beside them, seven kinds of databases are provided under the same base class.