Description: A virtual destructor is a type of destructor in C++ that is declared with the keyword ‘virtual’. Its main function is to ensure that when deleting an object of a derived class through a base class pointer, the destructor of the derived class is invoked. This is crucial in object-oriented programming as it allows for proper resource management and prevents memory leaks. Without a virtual destructor, deleting an object of a derived class would only call the destructor of the base class, potentially resulting in the failure to release resources specific to the derived class. Declaring a destructor as virtual is done in the base class and is a best practice in designing class hierarchies that use polymorphism. This ensures that the cleanup of objects is done correctly and completely, maintaining system integrity and avoiding undesirable behaviors. In summary, the virtual destructor is an essential tool for proper memory management and the stability of complex applications in C++.
