C++浅拷贝与深拷贝

通俗易懂,就是被复制的和复制的是同一片地址，而深拷贝的话是两个不同的地址

深拷贝与浅拷贝:c++不知道，你用一把钥匙来构造另一把钥匙的目的是什么

                        最朴素的复制一把一模一样的钥匙        

                        两把钥匙指向同一空间

#include <iostream>
#include <cstring>
using namespace std;


class Student
{
    char *name;
    char sex;
    int id;
public:
   Student()
   {
    cout<<"默认构造"<<endl;
   }
    Student(const char *name=" ", char sex=0, int id=0)
    {
        int len = strlen(name);
        this->name = new char[len+1];
        strcpy(this->name, name);
        this->sex = sex;
        this->id = id;
        cout<<"构造"<<endl;
    }
    Student(const Student& that)
    {
      
       name=that.name;  //两个name使用的是同一块地址
        sex=that.sex;
        id=that.id; //默认拷贝构造
        cout<< &that.name<<" "<<&name<<endl; 
    /*
        int len=strlen(that.name);
        this->name=new char[len+1];
        strcpy(this->name, that.name);
        this->sex=that.sex;
        this->id=that.id;       //深拷贝（开辟内存
        cout<< &that.name<<" "<<&name<<endl;
        cout<<"拷贝构造"<<endl;         //为了s1和s2不共用一块内存*/
    }
    ~Student()
    {
         delete[] name;
        cout<<"析构"<<endl;
       
    }
    Student& operator=(const Student& that)
    {
          if(this!=&that) //防止自拷贝
        {
            delete[] name;
            int len=strlen(that.name);
            name=new char[len+1];
            strcpy(name, that.name);
            sex=that.sex;
            id=that.id;
        }
        cout<<"赋值"<<endl;
        return *this;
    }
    void show(void)
    {
        cout<<&name<<" "<<name<<endl;
    }
};



//没有开辟空间，会重复释放空间，导致段错误
int main()
{
    Student s1("ke19",'m',1001);
    Student s2(s1);
   // Student s3 ;
    //s3=s1;
    s1.show();
    s2.show();

    
}

原文地址：https://blog.csdn.net/m0_67677309/article/details/143477825

免责声明：本站文章内容转载自网络资源，如本站内容侵犯了原著者的合法权益，可联系本站删除。更多内容请关注自学内容网（zxcms.com）！