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。 

#include <iostream>
#include <string>
using namespace std;

class Prototype
{
private:
	string str;
public:
	Prototype(string s)
	{
		str=s;
	}
	Prototype()
	{
		str="";
	}
	void show()
	{
		cout<<str<<endl;
	}
	virtual Prototype *clone()=0;
};

class ConcretePrototype1:public Prototype
{
public:
	ConcretePrototype1(string s):Prototype(s)
	{}
	ConcretePrototype1(){}
	virtual Prototype *clone()
	{
		ConcretePrototype1 *p=new ConcretePrototype1();
		*p=*this;
		return p;
	}
};


class ConcretePrototype2:public Prototype
{
public:
	ConcretePrototype2(string s):Prototype(s)
	{}
	ConcretePrototype2(){}
	virtual Prototype *clone()
	{
		ConcretePrototype2 *p=new ConcretePrototype2();
		*p=*this;
		return p;
	}
};


int main()
{
	ConcretePrototype1* test = new ConcretePrototype1("小王");
	ConcretePrototype2* test2 = (ConcretePrototype2*)test->clone();
	test->show();
	test2->show();

	return 0;
}