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Line 78: ===Composition and interfaces=== The C++ examples in this section demonstrate the principle of using composition and interfaces to achieve code reuse and polymorphism. Due to the C++ language not having a dedicated keyword to declare interfaces, the following C++ example uses "inheritance from a pure [[abstract base class"]]. For most purposes, this is functionally equivalent to the interfaces provided in other languages, such as Java and C#. Introduce an abstract class named {{code\|VisibilityDelegate}}, with the subclasses {{code\|NotVisible}} and {{code\|Visible}}, which provides a means of drawing an object:

Composition over inheritance: Difference between revisions