C++自己实现的字符串类

自己实现的字符串类 class CMStringImp; class CMstring { public: explicit CMstring(void); ~CMstring(void); CMstring(LPCTSTR lpszstr); CMstring(const CMstring& lpszstr); CMstring& operator = (const CMstring& lpszstr); operator LPCTSTR() const; bool operator == (const CMstring&) const; bool operator != (const CMstring&) const; bool operator < (const CMstring&) const; TCHAR operator[] (int nIndex) const; TCHAR& operator[] (int nIndex); CMstring& operator += (LPCTSTR pStr); CMstring& operator += (TCHAR ch); friend CMstring operator+(const CMstring& str1, const CMstring& str2); friend CMstring operator+(const CMstring& str1, LPCTSTR lpszstr); friend CMstring operator+(const CMstring& str1, TCHAR ch); friend CMstring operator+(TCHAR ch, const CMstring& str1); friend CMstring operator+(LPCTSTR lpszstr, const CMstring& str1); // friend wostream operator <<(wostream &is;,const CMstring &str;); public: LPCTSTR GetData() const; bool IsEmpty() const; TCHAR GetAt(int) const; TCHAR& GetAt(int); int GetLength() const; int Compare(const CMstring&) const; int CompareNoCase(const CMstring&) const; int Find(TCHAR ch, int nStart = 0) const; int Find(LPCTSTR pStr, int nStart = 0) const; int ReverseFind(TCHAR ch) const; int ReverseFind(LPCTSTR pStr) const; CMstring Right(int nCount) const; CMstring Left(int nCount ) const; public: CMstring& MakeLower(); CMstring& MakeUpper(); CMstring& MakeReverse(); int Replace(TCHAR chOld, TCHAR chNew); int Replace(LPCTSTR pszOld, LPCTSTR pszNew); int Insert(int iIndex, TCHAR ch); void Format(LPCTSTR lpszFormat, ...); private: CMStringImp* m_pImp; };