c++重载 =

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

class MyStr
{
private:
    char *name;
    int id;
public:
    MyStr() {}
    MyStr(int _id, char *_name)   //constructor
    {
        cout << "constructor" << endl;
        id = _id;
        name = new char[strlen(_name) + 1];//因为结尾有/0,所以要加1
        strcpy(name, _name);
    }
    MyStr(const MyStr& str)     //拷贝构造函数
    {
        cout << "copy constructor" << endl;
        id = str.id;
        if (name != NULL)
            delete name;
        name = new char[strlen(str.name) + 1];
        strcpy(name, str.name);
    }
    MyStr& operator =(const MyStr& str)//赋值运算符
    {
        cout << "operator =" << endl;
        if (this != &str) //自赋值检测
        {
            if (name != NULL) //覆盖数据
                delete name;
            this->id = str.id;
            int len = strlen(str.name);
            name = new char[len + 1];
            strcpy(name, str.name);
        }
        return *this;
    }
    ~MyStr()
    {
        delete name;
    }
};

int main()
{
    MyStr str1(1, "hhxx");//构造函数
    cout << "====================" << endl;
    MyStr str2;
    str2 = str1;//重载
    cout << "====================" << endl;
    MyStr str3 = str2;//拷贝构造
    return 0;
}

————

运行结果

constructor
====================
operator =
====================
copy constructor

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