C ++ Study Notes 25, always declare the Destructor as virtual

Always remember to declare the Destructor as virtual ----> < >

Maybe you don't think this sentence is correct, but you don't need to question it.

View the following example:

# Include
 
  
# Include
  
   
Using namespace std; class B {public :~ B () {cout <"base is destroyed! "<
   
    
This is a simple example, and the output is positive.
    

    

    
However, let's look at the test below!
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        # Include
       
         Using namespace std; class B {public :~ B () {cout <"base is destroyed! "<
        
         

        
       
      
     
    
Therefore, when a base class Pointer Points to an object in a derived class and deletes the pointer directly, the Destructor call chain will be damaged.
    

    
# Include
     
      
# Include
      
       
Using namespace std; class B {public: virtual ~ B () {cout <"base is destroyed! "<
       
        

        

        

        
Therefore, remember to declare the Destructor as virtual, so you never have to worry about the destruction of the Destructor call chain!