How does aggregation work in OOP?

C++ Aggregation (HAS-A Relationship) In C++, aggregation is a process in which one class defines another class as any entity reference . It is another way to reuse the class. It is a form of association that represents HAS-A relationship.

An aggregate object is one which contains other objects . For example, an Airplane class would contain Engine, Wing, Tail, Crew objects. Sometimes the class aggregation corresponds to physical containment in the model (like the airplane). But sometimes it is more abstract (e.g. Club and Members).

Definition of Aggregation in OOPS. Aggregation in OOPS is defined as a relation that exists between two or more two objects which individually have their own individual life cycle along with the ownership . Aggregation in OOPS constitutes 2 words (aggregation and OOPS).