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
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#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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原文链接：https://blog.csdn.net/wwxy1995/article/details/85084040
