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