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What’s the difference between the following two declarations?
virtual void calculateBase() = 0;
virtual void calculateBase();
I read the first one (=0) is a “pure abstract function” but what does that make the second one?
First one is called a pure virtual function. Normally pure virtual functions will not have any implementation and you can not create a instance of a class containing a pure virtual function.
Second one is a virtual function (i.e. a ‘normal’ virtual function). A class provides the implementation for this function, but its derived class can override this implementation by providing its own implementation for this method.