利用this指针实现对象资源的拷贝

#include <string.h>#include <iostream.h>class student{public:student(char * pName="no name",int ssId=0){id=ssId;name=new char[strlen(pName)+1];strcpy(name,pName);cout<<"construct new student "<<pName<<endl;}//错误！不能如此编写copy函数,因为实现的是前浅拷贝/*void copy(student & s){cout<<"construct copy of"<<s.name<<endl;strcpy(name,s.name);id=s.id;}*/void copy(student & s)  //资源复制函数{    if(this==&s){    cout<<"错误:不能将一个对象复制到自己！"<<endl;    return;}    else{    name=new char[strlen(s.name)+1];        // ①分配新的堆内存        strcpy(name,s.name);// ②完成值的复制        id=s.id;    cout<<"资源复制函数被调用！"<<endl;}}void disp(){cout<<"Name:"<<name<<"  Id:"<<id<<endl;}~student(){cout<<"Destruct "<<name<<endl;delete name;}private:int id;char * name;};void main(){student a("Kevin",12),b("Tom",23);   // 调用普通的构造函数    a.disp();b.disp();    a.copy(a);    b.copy(a);      // 调用资源复制函数a.disp();b.disp();}