Sams Teach Yourself C++ in 21 Days , Fifth Edition

Day 16. Advanced Class Relationship

So far, you have worked with single and multiple inheritance to create is-a relationships.

Today, you will learn

• What aggregation is and how to model it (the has-a relationship)

• What delegation is and how to model it

• How to implement one class in terms of another

• How to use private inheritance

Aggregation

You have seen in previous examples that it is possible for the member data of a class to contain objects of other class types. This is often called aggregation, or the has-a relationship.

As an illustration, consider classes such as a Name class and an Address class:

Class Name{     // Class information for Name};Class Address{     // Class information for Address};

As an illustration of aggregation, ...