模拟String类

模拟String类

#include<iostream>using namespace std;class String{public:String(char *data=""){if (*data == '\0'){_data = new char[1];*_data = '\0';}else{_data = new char[strlen(data) + 1];strcpy(_data, data);}}String(String &str) :_data(NULL){String temp(str._data);swap(temp._data, _data);}String &operator=(const String &str){if (this!= &str)//注意判断是否是自赋值{String temp(str._data);swap(temp._data, _data);}return *this;}~String(){if (_data != NULL){delete[]_data;}}private:char *_data;};int main(){String str1("jjjjj");String str2(str1);str2 = str2;system("pause");}