Pure VF has no definition.
http://www.studytonight.com/cpp/abstract-class-and-pure-virtual.php
Difference between Pure Virtual Function and a Virtual Function
"A virtual function or virtual method is a function or method whose behavior can be overridden within an inheriting class by a function with the same signature" - wikipedia
"A pure virtual function or pure virtual method is a virtual function that is required to be implemented by a derived class that is not abstract" - Wikipedia
tags:- Virtual function,pure virtual function,abstract class
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