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===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<ref name=Bloch>{{cite book | title= "Effective Java: Programming Language Guide" |last=Bloch| first=Joshua| publisher=Addison-Wesley | edition=third | isbn=978-0134685991| year=2018}}</ref>{{rp|87}} and C#.<ref name=Price>{{cite book |last=Price | first=Mark J. |title=C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development: Build Applications with C#, .NET Core, Entity Framework Core, ASP.NET Core, and ML.NET Using Visual Studio Code | publisher= Packt |isbn= 978-1-098-12195-2}}</ref>{{rp|144}}
Introduce an abstract class named {{code|VisibilityDelegate}}, with the subclasses {{code|NotVisible}} and {{code|Visible}}, which provides a means of drawing an object:
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