C + + virtual functions and virtual inheritance

Virtual function virtual represents dynamic inheritance, with the vptr pointer pointing to the vtable virtual table, and the address of each virtual function is saved in the virtual table.

The child class method is bound at run time by a parent class pointer.

Virtual inheritance: There are several parent classes, there are several vtab and vptr

Defines a function as pure virtual function, which means that the function is not implemented. Define he is in order to achieve an interface, play a normative role, the specification inherits this. The programmer of the class must implement this function.

virtual void fun () = 0; Description Fun function is pure virtual function

Two pictures:

http://blog.csdn.net/haoel/article/details/1948051/

C + + virtual functions and virtual inheritance