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C++设计模式迪米特法则实例

2019-05-21 18:03 2296 查看

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");
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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