C + + String deep copy (traditional notation + modern notation)

General wording   #include  <iostream>using namespace std;class string{of the c++string  class public: //Constructor  string (char*str =  "")           &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;:_STR (New char[strlen (str)  + 1])  {   strcpy (_STR,&NBSP;STR);  } //copy Construction  string (const string &s)  {  _str  = new char[strlen (S._STR)  + 1];  strcpy (_STR,&NBSP;S._STR);  } // Operator= Heavy-duty  string&operator= (Const string &s)  {  if  (this !=  &s)   {   /*delete[]_str;   _str = new char[ Strlen (S._STR)  + 1];   strcpy (_STR,&NBSP;S._STR); */   char*tmp =  new char[strlen (S._STR)  + 1];   strcpy (TMP,&NBSP;S._STR);    delete[]_str;   _str = tmp;     }  return *this; } // destructor  ~string ()                            {  if  (_STR)   {    delete[]_str;  } } char *cstr ()  {  return _str;  }char& operator[] (Size_t index) { return _str[index];} private: char*_str;};/ The modern notation of/c++string class #include <iostream>using namespace std;class string{public:  String (char*str= "")   :_str (New char[strlen (str) +1])  {  strcpy (_STR,&NBSP;STR);  } string (const string&s)   :_str (NULL)  {  string tmp (S._STR);   swap (_STR,&NBSP;TMP._STR);  } string&operator= (const string &s)  {   if (This ! = &s)   {   string tmp (S._STR);    swap (_str, tmp._ STR);   }  return *this; } // operator=  optimization  String& Operator= (string s)  {  swap (_STR,&NBSP;S._STR);  return *this; }  ~string ()  {  if  (_STR)   {   delete[]_str;  } }  char *cstr ()  {    return _str; }char& operator[] (size_t  index) { return _str[index];} private: char*_str;};

This article is from the "printf Return Values" blog, so be sure to keep this source http://10741125.blog.51cto.com/10731125/1754454

C + + String deep copy (traditional notation + modern notation)