© Thomas Mailund 2017

Thomas Mailund, Advanced Object-Oriented Programming in R, 10.1007/978-1-4842-2919-4_2

2. Class Hierarchies

Thomas Mailund

(1)Aarhus N, Denmark

There is more to polymorphism than merely abstract data types that can have different concrete implementations. A fundamental concept found in most object-oriented programming languages is classes and class hierarchies. Class hierarchies serve two conceptually different purposes: refinement of object interfaces and code reuse. Neither concept, strictly speaking, requires class hierarchies in R, since R is dynamically typed, unlike programming languages such as C++ or Java where class hierarchies and the static type system are intertwined. Nevertheless, class hierarchies provide a framework ...

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