C++设计模式迪米特法则实例分享！

迪米特法则（Law of Demeter）又叫作最少知识原则（Least Knowledge Principle 简写LKP），就是说一个对象应当对其他对象有尽可能少的了解,不和陌生人说话。英文简写为: LoD.

类的设计接口尽量封装完善，让外部直接调用

  #include<iostream>  #include<string>  #include<vector>  using namespace std;     class AbstractBuilding  {  public:   virtual void sale() = 0;   virtual string getQuality() = 0;     };     class BuildingA :public AbstractBuilding  {  public:      BuildingA()   {   mQulity = "高品质";   }      virtual void sale()   {   cout << "楼盘A" << mQulity << "被售卖!" << endl;   }      virtual string getQuality()   {   return mQulity;   }     public:   string mQulity;  };        class BuildingB :public AbstractBuilding  {  public:      BuildingB()   {   mQulity = "低品质";   }      virtual void sale()   {   cout << "楼盘B" << mQulity << "被售卖!" << endl;   }      virtual string getQuality()   {   return mQulity;   }     public:   string mQulity;  };     // 中介类  class Mediator  {  public:   Mediator()   {   AbstractBuilding* building = new BuildingA;   vBuilding.push_back(building);   building = new BuildingB;   vBuilding.push_back(building);   }      // 对外提供接口   AbstractBuilding* findMyBuilding(string quality)   {   for (vector<AbstractBuilding*>::iterator it = vBuilding.begin();    it != vBuilding.end(); it++)   {    if ((*it)->getQuality() == quality)    {    return *it;    }   }      return NULL;   }      ~Mediator()   {   for (vector<AbstractBuilding*>::iterator it = vBuilding.begin();    it != vBuilding.end(); it++)   {    if (*it != NULL)    delete *it;   }   }  public:   vector<AbstractBuilding*> vBuilding;  };        void test01()  {   Mediator* mediator = new Mediator;      AbstractBuilding* building = mediator->findMyBuilding("低品质");      if (building != NULL)   {   building->sale();      }   else   {   cout << "没有符号条件的楼盘" << endl;   }     }     int main()  {   test01();   system("pause");  }

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