Interview: C++string class implementation

1#include <iostream>2#include <cstring>3 using namespacestd;4 5 6 classCString {7 Private:8     Char*m_pdata;9  Public:TenCString (Const Char* ptr =nullptr) { One         if(ptr = = nullptr) M_pdata =nullptr; AM_pdata =New Char[Strlen (PTR) +1]; - strcpy (M_pdata, PTR); -     } theCString (Constcstring&a) { -         if(A.m_pdata = = nullptr) This->m_pdata =nullptr; -          This->m_pdata =New Char[Strlen (A.m_pdata) +1]; -strcpy This-m_pdata, a.m_pdata); +     } -  +CString (cstring&&a) { A          This->m_pdata =A.m_pdata; atA.m_pdata =nullptr; -     } -  -~CString () { -         if( This-m_pdata) { -              Delete[] This-m_pdata; in         } -     } to  +cstring&operator=(Constcstring&a) { -         if( This= = &a) the             return* This; *  $         if( This-m_pdata)Panax Notoginseng             Delete[] This-m_pdata; -          This->m_pdata =New Char[Strlen (A.m_pdata) +1]; thestrcpy This-m_pdata, a.m_pdata); +         return* This; A     } the  +CStringoperator+=(Constcstring&a) { -         if(A.m_pdata = =nullptr) { $             return* This; $}Else if( This->m_pdata = =nullptr) { -             returnA; -}Else { the             Char* TMP = This-m_pdata; -              This->m_pdata =New Char[Strlen ( This->m_pdata) +strlen (a.m_pdata)Wuyi+1]; thestrcpy This-m_pdata, TMP); -Strcat This-m_pdata, a.m_pdata); Wu             Delete[] tmp; -             return* This; About         } $     } -  -Friend CStringoperator+(Constcstring& A,Constcstring&b) { -         Char* Res =New Char[Strlen (A.m_pdata) + strlen (b.m_pdata) +1]; A strcpy (res, a.m_pdata); + strcat (res, b.m_pdata); the CString CS (res); -         Delete[] Res; $         returnCS; the     } the  theFriend ostream&operator<< (ostream& OS,Constcstring&a) { theOS <<A.m_pdata; -         returnos; in     } the }; the  About intMain () { the  theCString A ("ABC"); the CString B (a); +A =b; -A + =b; theCString C = A +b;BayiStd::cout << C <<Std::endl; theStd::cout << a <<Std::endl; the  -     return 0; -}

Interview: C++string class implementation