Has-a

Has-a

In database design and object oriented program architecture, has-a is a relationship where one object (often called the composited object) "belongs" to (is a part or member of) another object (called the composite type), and behaves according to the rules of ownership. Multiple "has-a" relationships will combine to form a possessive hierarchy. This is contrasted with an Is-a relationship which constitutes a different kind of hierarchy (subtyping). The decision whether the most logical relationship for an object and its subordinate is not always clearly "has-a" or "is-a". Confusion over such decisions have necessitated the creation of these metalinguistic terms. A good example of the "has-a" relationship is containers in the C++ STL.

ee also

* Is-a
* Object composition


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