C++笔记之全局函数做友元与类做友元

code review!

1.全局函数做友元

代码

#include <iostream>
using namespace std;

class MyClass {
private:
    int x;
public:
    MyClass(int a) : x(a) {}
    friend void printX(MyClass obj);
};

void printX(MyClass obj) {
    cout << "The private member x of MyClass is: " << obj.x << endl;
}

int main() {
    MyClass obj(10);
    printX(obj);
    return 0;
}

2.类作友元

代码

class B;

class A {
private:
    int a;
public:
    friend class B; // 声明B为A的友元类
};

class B {
public:
    void func(A &obj) {
        obj.a = 10; // 可以访问A类的私有成员a
    }
};