#include<stdlib.h>
#include<iostream>
#include<string>
using namespace std;
/*
4.4.3 成员函数做友元
*/
class Building;
class Goodgay{
public:
Goodgay(); // 构造声明
void visit(); // 令该函数可以访问Building类中私有成员
void visit2(); // 令该函数不可访问Building类中私有成员
private:
Building * building;
};
class Building{
// //告诉编译器 goodGay类中的visit成员函数 是Building好朋友,可以访问私有内容
friend void Goodgay::visit();
public:
string setting_room;
private:
string bed_room;
public:
Building(); // 构造声明
};
// 类外实现成员函数
Building::Building(){
setting_room = "客厅";
bed_room = "卧室";
}
Goodgay::Goodgay(){
building = new Building;
}
void Goodgay::visit(){
cout << "visit函数正在访问:" << building->setting_room << endl;
cout << "visit函数正在访问:" << building->bed_room << endl; // 声明友元后可访问
}
void Goodgay::visit2(){
cout << "visit2函数正在访问:" << building->setting_room << endl;
//cout << "visit函数正在访问:" << building->bed_room << endl; // 正常无法访问,会报错
}
void test1(){
Goodgay gg;
gg.visit();
gg.visit2();
}
int main()
{
test1();
system("pause");
return 0;
}
11.4.3重学C++之【成员函数做友元】
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转载自blog.csdn.net/HAIFEI666/article/details/114881673
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