C + + Sets the destructor for the base class as a virtual function

A destructor is a function that is called automatically when the life cycle of an object ends.

In the following function, execution will find that only the destructor of the base class is called, and the destructor of the derived class is not called, causing the object not to be released normally, causing a memory leak.

The destructor of the base class is set to a virtual function, and the destructor of the object is executed when the dynamic call is made.

Class Subject{public:~subject (); Subject ();}; Class Concretesubject:public Subject{public:concretesubject (); ~concretesubject ();}; Subject * con = new ConcreteSubject ();d elete con;

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C + + Sets the destructor for the base class as a virtual function