#pragma once #include "stdafx.h" #include<map> #include<set> #include<string> #include<iostream> using namespace std;/*設計模式-享元模式（Flyweight）運用共享技術有效地支持大量細粒度的對象。 */class CFlyweight {//所有具體享元的超類或接口。通過這個接口，Flyweight可以接受并作用域外部狀態。 public:virtual void Operation(const int &nExtrinsicstat) = 0; };class CConcreteFlyweight :public CFlyweight {//為內部狀態增加存儲空間。 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 {//享元工廠，用來創建并管理Flyweight對象。 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; }

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