In C ++, to implement dynamic concatenation, you must use (base class pointer) to call the virtual function.

In C ++ (Base Class pointer) Call virtual functions

Association refers to a computer.ProgramThe process of self-Association. According to the different stages of association editing, there are two different association methods: static Association editing and Dynamic Association editing. During the compilation phase, the Compilation Program does not know exactly the function to be called. Only when the program is executed can it determine the function to be called. Therefore, it is necessary to know exactly the called function, it is required that the compilation work be carried out during the running of the program. Such association work is called Dynamic Association, dynamic bundle, or late Association. C ++ stipulates that dynamic Association is implemented with the support of virtual functions.