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Pure virtual function in C++ is the key feature that lets you create interfaces (or abstract classes that behave like interfaces).
What is a Pure Virtual Function?
A pure virtual function is a virtual function that:
Has = 0 at the end
Has no implementation in the base class (or sometimes just a dummy one)
Forces every derived (child) class to provide its own implementation
we cant instantiate the interface class [only sub classes we can and have to]
Interfaces are just classes in c++ with unimplemented methods acting as template of source unlike other languages as java or c#*/