C++实现享元模式

/*享元模式：运用共享技术，有效的实现支持大量细粒度对象的复用Created by Phoenix_FuliMa*/#include <iostream>#include <string>#include <map>using namespace std;static int objnum = 0;class FlyWeight{public:virtual void Operate(string outer) = 0;};class ConcreteFlyWeight:public FlyWeight{private:string name;public:ConcreteFlyWeight(string name):name(name){objnum++;cout<<"Construct ....."<<endl;}void Operate(string outer){cout<<"concrete flyweight is operating "<<outer<<endl;}};class FlyWeightFactory{private:map<string, FlyWeight*> _objects;public:FlyWeight* GetFlyWeight(string name){map<string, FlyWeight*>::iterator iter;iter = _objects.find(name);if(iter == _objects.end()){FlyWeight* _tmp = new ConcreteFlyWeight(name);_objects[name] = _tmp;return _tmp;}else{return iter->second;}}~FlyWeightFactory(){map<string, FlyWeight*>::iterator iter = _objects.begin();for(; iter != _objects.end(); iter++){delete iter->second;}}};int main(){FlyWeightFactory *factory = new FlyWeightFactory();FlyWeight* test1 = factory->GetFlyWeight("test1");test1->Operate("funny");FlyWeight* test2 = factory->GetFlyWeight("test1");test2->Operate("not funny");cout<<"number of instance is "<<objnum<<endl;delete factory;system("pause");return 0;}