C++设计模式迪米特法则实例

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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两粒种子，一片森林。