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Composition over inheritance (or composite reuse principle) in object-oriented programming (OOP) is the principle that classes should favor polymorphic behavior and code reuse by their composition (by containing instances of other classes that implement the desired functionality) over inheritance from a base or parent class. [2]
Inheritance is contrasted with object composition, where one object contains another object (or objects of one class contain objects of another class); see composition over inheritance. In contrast to subtyping’s is-a relationship, composition implements a has-a relationship.
Composition over inheritance: "Favor 'object composition' over 'class inheritance'." (Gang of Four 1995:20) The authors claim the following as advantages of interfaces over implementation: clients remain unaware of the specific types of objects they use, as long as the object adheres to the interface
Therefore, a university can be seen as a composition of departments, whereas departments have an aggregation of professors. In addition, a professor could work in more than one department, but a department could not be part of more than one university. Composition is usually implemented such that an object contains another object.
Some languages like Go do not support inheritance at all. Go states that it is object-oriented, [35] and Bjarne Stroustrup, author of C++, has stated that it is possible to do OOP without inheritance. [36] The doctrine of composition over inheritance advocates implementing has-a relationships using composition instead of inheritance. For ...
The ECS uses composition, rather than inheritance trees. An entity will be typically made up of an ID and a list of components that are attached to it. Any game object can be created by adding the correct components to an entity. This allows the developer to easily add features to an entity, without any dependency issues.
So avoiding probate with a living trust could make it so your heirs get their hands on their inheritance more quickly and with less aggravation. But that's not even the main reason I'm interested ...
declares the interface for objects in the composition (optional) defines an interface for accessing a component's parent in the recursive structure, and implements it if that's appropriate; Leaf. represents leaf objects in the composition; implements all Component methods; Composite. represents a composite Component (component having children)