测试...外部指针访问private

#include<iostream>

using namespace std;


class A{
public:
    int* getPointer(){
        return &m;
    }
    void out(){
        cout<<"m = "<<m<<endl;
    }
private:
    int m;    
    
};

int main(){
    int *p = nullptr;
    A a;
    
    p = a.getPointer();
    
    *p = 3;
    
    
    a.out();
}