设计模式复习-享元模式

#pragma once
#include "stdafx.h"
#include<map>
#include<set>
#include<string>
#include<iostream>
using namespace std;

/*
	设计模式-享元模式（Flyweight）
	运用共享技术有效地支持大量细粒度的对象。
*/

class CFlyweight {//所有具体享元的超类或接口。通过这个接口，Flyweight可以接受并作用域外部状态。
public:
	virtual void Operation(const int &nExtrinsicstat) = 0;
};

class CConcreteFlyweight :public CFlyweight {//为内部状态增加存储空间。
public:
	void Operation(const int &nExtrinsicstate) {
		cout << "ju ti Flyweight:" << nExtrinsicstate << endl;
	}
};

class CUnsharedconcreteFlyweight :public CFlyweight {
public:
	void Operation(const int &nExtrinsicstate) {
		cout << "bu gong xiang de ju ti Flyweight:" << nExtrinsicstate << endl;
	}
};

class CFlweightFactory {//享元工厂，用来创建并管理Flyweight对象。
private:
	map<string, CFlyweight*>mmpFlyweight;
public:
	CFlweightFactory() {
		mmpFlyweight.clear();
		mmpFlyweight["X"] = new CConcreteFlyweight();
		mmpFlyweight["Y"] = new CConcreteFlyweight();
		mmpFlyweight["Z"] = new CConcreteFlyweight();
	}
	~CFlweightFactory() {
		delete mmpFlyweight["X"];
		delete mmpFlyweight["Y"];
		delete mmpFlyweight["Z"];
	}
	CFlyweight * GetFlyweight(string strKey) {
		return mmpFlyweight[strKey];
	}
};


int main() {

	int nExtrinsicstate = 10;
	CFlweightFactory *pFac = new CFlweightFactory();

	CFlyweight *pNowFlyweight = pFac->GetFlyweight("X");
	pNowFlyweight->Operation(--nExtrinsicstate);

	pNowFlyweight = pFac->GetFlyweight("Y");
	pNowFlyweight->Operation(--nExtrinsicstate);

	pNowFlyweight = pFac->GetFlyweight("Z");
	pNowFlyweight->Operation(--nExtrinsicstate);

	pNowFlyweight = new CUnsharedconcreteFlyweight();
	pNowFlyweight->Operation(--nExtrinsicstate);

	delete pFac, delete pNowFlyweight;
	
	getchar();
	return 0;
}