1 #ifndef PARENT_H_

     2 #define PARENT_H_

     3 

     4 class MParent

     5 {

     6 public:

     7 	virtual void Add() = 0;

     8 };

     9 

    10 class MParent2

    11 {

    12 public:

    13 	virtual void Del() = 0;

    14 };

    15 

    16 #endif /*PARENT_H_*/