What is a virtual destructor?
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Virtual Destructor in C++ is a member function that frees up the memory allocated by the object of a child class or derived class when it is removed from the memory using the parent class pointer object. Virtual destructor in C++ is mainly responsible for resolving the memory leak problem.
When destroying instances or objects of a derived class using a base class pointer object, a virtual destructor is invoked to free up memory space allocated by the derived class object or instance.
Virtual destructor guarantees that first the derived class’ destructor is called. Then the base class’s destructor is called to release the space occupied by both destructors in the inheritance class which saves us from the memory leak. It is advised to make your destructor virtual whenever your class is polymorphic.