Cpp-learning/友元/3、成员函数做友元.cpp

//4.4.3   成员函数做友元



#include <iostream>

class Building;

class GoodGay
{
public:
	GoodGay();

	void visit();                   //让visit函数可以访问Building中私有成员

	void visit2();                 //让visit2函数不可以访问Building中私有成员
	

	Building* building;
};

class Building
{
	//告诉编译器  GoodGay类下的visit成员函数作为本类的好朋友，可以访问私有成员
	friend void GoodGay::visit();

public:

	Building();

public:
	
	std::string m_SittingRoom;        //客厅

private:

	std::string m_BedRoom;         //卧室

};

//类外实现成员函数

Building::Building()
{
	this->m_BedRoom = "卧室";
	this->m_SittingRoom = "客厅";
}

GoodGay::GoodGay()
{
	building = new Building;
}

void GoodGay::visit()
{
	std::cout << "visit函数正在访问:" << building->m_SittingRoom << std::endl;

	std::cout << "visit函数正在访问:" << building->m_BedRoom << std::endl;
}

void GoodGay::visit2()
{
	std::cout << "visit2函数正在访问:" << building->m_SittingRoom << std::endl;

	//std::cout << "visit2函数正在访问:" << building->m_BedRoom << std::endl;
}

void test01()
{
	GoodGay gg;
	gg.visit();
	gg.visit2();
}

int main()
{
	test01();
	

	system("pause");

	return 0;
}