设计模式之二十二：享元模式(FlyWeight)

享元模式：使用共享技术有效地支持大量细粒度的对象。 Use sharing to support large numbers of fine-grained objects efficiently. 这个设计模式和它的名字一样核心是为了共享代码。

UML图：

主要包括：

C++代码：

;class FlyWeight{public:virtual void operation(int extrinsicState)=0;};class ConcreteFlyWeight:public FlyWeight{public:void operation(int extrinsicState){cout<<“ConcreteFlyWeight : “<<extrinsicState<<endl;}};class UnSharedConcreteFlyWeight:public FlyWeight{public:void operation(int extrinsicState){cout<<“UnSharedConcreteFlyWeight : “<<extrinsicState<<endl;}}; class FlyWeightFactory{public:FlyWeightFactory(){flyWeights[“X”]=new ConcreteFlyWeight();flyWeights[“Y”]=new ConcreteFlyWeight();flyWeights[“Z”]=new ConcreteFlyWeight();}FlyWeight * getFlyWeight(string key){return flyWeights[key];}private:map<string,FlyWeight *> flyWeights;};int main(){cout<<“基本享元模式代码”<<endl;int extrinsicState=22;FlyWeightFactory *factory=new FlyWeightFactory();FlyWeight * fx=factory->getFlyWeight(“X”);fx->operation(–extrinsicState);FlyWeight * fy=factory->getFlyWeight(“Y”);fy->operation(–extrinsicState);FlyWeight * fz=factory->getFlyWeight(“Z”);fz->operation(–extrinsicState);FlyWeight * fu=new UnSharedConcreteFlyWeight();fu->operation(–extrinsicState);delete factory;delete fx;delete fy;delete fz;delete fu;return 0;}

执行输出：

只有坚韧不拔向着目标奋进，成功后将在不远处等待着你的到来。

相关文章：

你感兴趣的文章：

标签云：