Prototype 原型模式

 

  

GOOD：从一个对象再创建另外一个可定制的对象，而无需知道任何创建的细节。并能提高创建的性能。说白了就COPY技术，把一个对象完整的COPY出一份。

 

例：

#include<iostream>

#include <vector>

#include <string>

using namespace std;

 

class Prototype //抽象基类

{

private:

       string m_strName;

public:

       Prototype(string strName){ m_strName = strName; }

       Prototype() { m_strName = " "; }

       void Show()

       {

              cout<<m_strName<<endl;

       }

       virtual Prototype* Clone() = 0 ;

} ;

 

// class ConcretePrototype1

class ConcretePrototype1 : public Prototype

{

public:

       ConcretePrototype1(string strName) : Prototype(strName){}

       ConcretePrototype1(){}

 

       virtual Prototype* Clone()

       {

              ConcretePrototype1 *p = new ConcretePrototype1() ;

              *p = *this ; //复制对象

              return p ;

       }

} ;

 

// class ConcretePrototype2

class ConcretePrototype2 : public Prototype

{

public:

       ConcretePrototype2(string strName) : Prototype(strName){}

       ConcretePrototype2(){}

 

       virtual Prototype* Clone()

       {

              ConcretePrototype2 *p = new ConcretePrototype2() ;

              *p = *this ; //复制对象

              return p ;

       }

} ;

 

//客户端

int main()

{

       ConcretePrototype1* test = new ConcretePrototype1("小王");

       ConcretePrototype2* test2 = (ConcretePrototype2*)test->Clone();

       test->Show();

       test2->Show();

       return 0;

}