The principle of virtual function

Source: Internet
Author: User

Virtual functions are a basis for polymorphic mechanisms, and should be determined at runtime, because the program only knows that it is a pointer type of the base class, but at runtime it can point to different base classes, and the methods in the base class covered in the base class will overwrite the function pointers in the original base class in the virtual function table. becomes the corresponding function pointer for the derived class.

[1] http://www.cnblogs.com/BeyondAnyTime/archive/2012/07/22/2603760.html

The principle of virtual function

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