Concrete classes that inherit virtual functions but do not override their implementations: Receive pointers to pure virtual functions. Receive their own copies of the virtual functions. Receive pointers to their base classes' virtual functions. Have vtables which are the same as those of their base classes.
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When a concrete class inherits virtual functions without overriding them, it effectively keeps the behavior of the base class. This means that any objects of the concrete class can be treated just like objects of the base class, benefiting from polymorphism. These inherited functions can be invoked just by calling them on the derived class instances, relying on the base class's implementation, which can save time and effort in coding. However, while these concrete classes have vtables that match those of their base classes, it's crucial to be aware of potential pitfalls. Not overriding a virtual function can lead to unintended behavior if the base class's implementation changes, or if specific functionality is needed. Always ensure that the base class's implementation meets the requirements of the derived class to avoid subtle bugs during runtime.