如何访问标准库算法中的类私有成员？c++

#include <iostream>
#include <algorithm>

class MyClass {
private:
    int privateMember;

    friend void friendFunction(MyClass& obj); // 声明友元函数

public:
    void setPrivateMember(int value) {
        privateMember = value;
    }

    int getPrivateMember() {
        return privateMember;
    }
};

void friendFunction(MyClass& obj) {
    std::cout << "Accessing private member through friend function: " << obj.privateMember << std::endl;
}

int main() {
    MyClass obj;
    obj.setPrivateMember(42);

    friendFunction(obj); // 通过友元函数访问私有成员

    std::cout << "Accessing private member through public member function: " << obj.getPrivateMember() << std::endl; // 通过公有成员函数访问私有成员

    return 0;
}

Accessing private member through friend function: 42
Accessing private member through public member function: 42