Inheritance structure and Structure

When a subclass object is constructed, it first calls the constructor of the parent class and then calls its own constructor. The structure order is the opposite.

Check the test code:

# Include

 
  
# Include

  
   
Using namespace std; class grandparent {public: grandparent () {cout <"grandparent ()" <

   

    


    


    



    
The output result is as follows:

    


    
The result is obvious. When the subclass is constructed, the father's constructor is called first. The father finds that he still has a father, so the parent class calls the grandfather of the subclass,

    
The construction of the parent class continues after the call ends. The Child class constructor is called only after the parent class constructor ends. The order of the parent class is the opposite ~~