Aggregation in C++
- Aggregation in C++ is a relationship between two classes where one class, called the "aggregator" or "container" class, contains an instance of another class, called the "aggregated" or "contained" class.
- Aggregation represents a "has-a" relationship, where one class contains or is composed of another class as a part.
Key characteristics of aggregation in C++
- Ownership: In an aggregation relationship, the aggregator class owns the aggregated class, meaning that the lifetime of the contained object is managed by the aggregator.
- Multiplicity: Aggregation can represent one-to-one, one-to-many, or many-to-one relationships. For example, a university "has" many students (one-to-many), or a computer "has" a keyboard (one-to-one).
- Navigation: The aggregator class can access and manipulate the contained class's members and functions.
Aggregation in C++ Example
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This code demonstrates aggregation, where the Dog class contains a Tail object, and it can interact with and use the behavior of that Tail object through function calls.
Conclusion
Aggregation in C++ represents a relationship where one class contains another class as a part, creating a "has-a" association. It allows objects of one class to utilize the services or properties of another class without direct ownership.