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What is a 'pure' virtual function and what's its use?
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Answer / phool chand
A pure virtual function is signified by using `=0;' in place of the body of the function. The presence of a pure virtual function prevents instantiation of the class which contains it. For this to be of any use, a derived class must implement the pure virtual function. I.e. the derived class must provide a function with the same name which includes a function body.
The basic reason for pure virtual functions is to specify something that a class can do without specifying how the class will do it.
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