1 #define _CRT_SECURE_NO_WARNINGS 2 #include 
     
       3 using namespace std; 4  5 class mystring 6 { 7 public: 8     char *pstr; 9     int length;10     mystring():pstr(nullptr),length(0)11     {12 13     }14 15     mystring(char *str)16     {17         //获取字符串长度18         this->length = strlen(str) + 1;19         this->pstr = new char[this->length + 1];20         //拷贝21         strcpy(this->pstr, str);22     }23 24     //拷贝构造25     mystring(const mystring &my)26     {27         this->length = my.length;28         this->pstr = new char[this->length];29         strcpy(this->pstr, my.pstr);30     }31 32     mystring add(const mystring &my)33     {34         int n = this->length + my.length - 1;35         mystring temp;36         temp.length = n;37         //分配内存38         temp.pstr = new char[temp.length];39         strcpy(temp.pstr, this->pstr);40         //尾部添加41         strcat(temp.pstr, my.pstr);42         return temp;43     }44 45     //重载加法46     mystring operator +(const mystring &my)47     {48         int n = this->length + my.length - 1;49         mystring temp;50         temp.length = n;51         //分配内存52         temp.pstr = new char[temp.length];53         strcpy(temp.pstr, this->pstr);54         //尾部添加55         strcat(temp.pstr, my.pstr);56         return temp;57     }58 };59 60 template
      
       61 T add(T a, T b)62 {63     return a + b;64 }65 66 void main()67 {68     mystring str1 = "hello";69     mystring str2 = "world";70     //mystring str3 = str1.add(str2);71     //mystring str3 = str1 + str2;72     mystring str3 = str1.operator+(str2);73     cout << str3.pstr << endl;74 75     //模板与运算符重载76     cout << add
       
        (str1, str2).pstr << endl;77     cin.get();78 }