友元的三种实现
#include <iostream>
#include <string>
using namespace std;
class Building
{friend void goodGay(Building* building);
public:Building(){m_S = "客厅";m_B = "卧室";}
public:string m_S;
private:string m_B;
};void goodGay(Building* building)
{cout << "好基友正在访问:" << building->m_S << endl;cout << "好基友正在访问:" << building->m_B << endl;}
void test01()
{Building b;goodGay(&b);
}int main()
{test01();return 0;
}
类做友元
#include <iostream>
#include <string>
using namespace std;//友元的三种实现
//
//* 全局函数做友元
//* 类做友元
//* 成员函数做友元
class Building;
class goodGay
{public:goodGay();void visit();private:Building* building;
};class Building
{//告诉编译器goodGay类是Building类的好朋友,可以访问到Building类中的私有内容friend class goodGay;
public:Building();
public:string m_S;
private:string m_B;
};Building::Building()
{m_S = "客厅";m_B = "卧室";
}goodGay::goodGay()
{building = new Building;
}
void goodGay::visit()
{cout << "好基友正在访问" << building->m_S << endl;cout << "好基友正在访问" << building->m_B << endl;
}void test01()
{goodGay gg;gg.visit();
}int main()
{test01();return 0;
}
成员函数做友元
#include <iostream>
#include <string>
using namespace std;
class Building;
class goodGay
{public:goodGay();void visit();void visit2();private:Building* building;
};class Building
{friend void goodGay::visit();public:Building();
public:string m_S;
private:string m_B;
};Building::Building()
{m_S = "客厅";m_B = "卧室";
}goodGay::goodGay()
{building = new Building;
}
void goodGay::visit()
{cout << "好基友正在访问" << building->m_S << endl;cout << "好基友正在访问" << building->m_B << endl;
}
void goodGay::visit2()
{cout << "好基友正在访问" << building->m_S << endl;
}
void test01()
{goodGay gg;gg.visit2();
}int main()
{test01();return 0;
}