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I'm learning about C++ in a class right now and I don't quite grok pure virtual functions. I understand that they are later outlined in a derived class, but why would you want to declare it as equal to 0 if you are just going to define it in the derived class?
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A pure virtual function is a virtual function in C++ for which we need not to write any function definition and only we have to declare it. It is declared by assigning 0 in the declaration. An abstract class is a class in C++ which have at least one pure virtual function.
When destroying instances of a derived class using a base class pointer object, a virtual destructor is used to free up memory space allocated by the derived class object or instance. Note: Only Destructors can be Virtual.
2. What is a pure virtual function in C++? Explanation: Pure virtual function is a virtual function which has no definition/implementation in the base class.
Briefly, it's to make the class abstract, so that it can't be instantiated, but a child class can override the pure virtual methods to form a concrete class. This is a good way to define an interface in C++.
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