C++ Virtual Functions Interview Question:

Tell me can a pure virtual function have an implementation?

Submitted by: Muhammad

The quick answer to that question is yes! A pure virtual function can have an implementation in C++ - which is something that even many veteran C++ developers do not know. So, using the SomeClass class from our example above, we can have the following code:

class SomeClass {
public:
virtual void pure_virtual() = 0; // a pure virtual function
// note that there is no function body
};

/*This is an implementation of the pure_virtual function
which is declared as a pure virtual function.
This is perfectly legal:
*/
void SomeClass::pure_virtual() {
cout <<"This is a test"<< endl;
}< /endl;

Submitted by: Muhammad