C Language and Design pattern (prototype mode)

Turn from: http://blog.csdn.net/feixiaoxing/article/details/7075316

The prototype pattern is essentially a copy of the current data. Like a juggler, a dove becomes two pigeons, two pigeons become three pigeons, and it goes on and on. In the process of change, we do not need to consider the specific data types. Why, then? Because different data has its own type of replication, and each copy function is a virtual function.

How to write in C + +, that is, first write a base class, and then write a subclass. It's so simple.

View plain class data   {   public:       data  ()   {}       virtual ~data ()  {}       virtual  class data* copy ()  = 0;  };      class data_a  : public data   {   public:       data_a ()  {}        ~data_a ()  {}       class data*  copy ()        {            Return new data_a ();       }  };      class  data_B : public data   {   public:        Data_b ()  {}       ~data_b ()  {}        Class data* copy ()