深拷贝与浅拷贝

最新推荐文章于 2024-11-28 23:02:43 发布

huang123307

最新推荐文章于 2024-11-28 23:02:43 发布

阅读量437

点赞数

分类专栏： C++

本文链接：https://blog.youkuaiyun.com/huang123307/article/details/8711414

版权

C++ 专栏收录该内容

15 篇文章

订阅专栏

本文通过两个C++示例探讨了类成员指针的内存管理问题，特别是涉及new与delete操作符的使用场景，以及浅拷贝导致的问题。文章强调了在类中直接new指针可能导致的内存泄露风险，并提到了深拷贝和浅拷贝的概念。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

#include<iostream>
using namespace std;

class TestClass{

public:
    int *pPointer;

    InIPoint(){
        pPointer=new int;
	   }

    ~InIPoint(){
        delete pPointer;
	   }
}a,b;

int main(){

    *(b.pPointer)=89;
    a=b;
    cout<<"*(a.pPointer):"<<*(a.pPointer)<<endl;
    cout<<"*(b.pPointer):"<<*(b.pPointer)<<endl;

    return 0;
}

备注：new到局部新定义的指针了，函数返回这个地址就没了，new的内存也就那么放着没法用，也就是内存泄露。

#include<iostream>
using namespace std;

class TestClass{

public:
    int *pPointer;

    /*InIPoint(){
        pPointer=new int;
	   }

    ~InIPoint(){
        delete pPointer;
	   }*/
}a,b;

int main(){

    b.pPointer=new int;

    *(b.pPointer)=89;
    cout<<"*(b.pPointer):"<<*(b.pPointer)<<endl;

    a=b;
    cout<<"*(a.pPointer):"<<*(a.pPointer)<<" "<<"*(b.pPointer):"<<*(b.pPointer)<<endl;

    *(a.pPointer)=55;
    cout<<"*(a.pPointer):"<<*(a.pPointer)<<" "<<"*(b.pPointer):"<<*(b.pPointer)<<endl;

    delete b.pPointer;
    cout<<"*(a.pPointer):"<<*(a.pPointer)<<" "<<"*(b.pPointer):"<<*(b.pPointer)<<endl;

    return 0;
}