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operation comparison table
Subject let has definition be is a subtopic of implement by
abstract operation An operation in a class that makes logical sense for all subclasses, but that is not implemented in the class 2.6 - The Effect of Inheritance Hierarchies on Polymorphism and Variable Declarations 
polymorphic operationa running program decide, every time an operation is called, which of several identically-named methods to invoke  2.4 - Methods, Operations and Polymorphismseveral different methods
pure virtual function  a C++ abstract operation2.6 - The Effect of Inheritance Hierarchies on Polymorphism and Variable Declarations 

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