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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