Reverse iterator in file

class mybuffer: public basic_filebuf<char>
{
public:
  char* Beg() { return gptr(); }
  char* End() { return egptr(); }
};

int _tmain(int argc, _TCHAR* argv[])
{
  std::ifstream file;
  file.open(_T("d:\\test.txt"));
  
  mybuffer* Buf = (mybuffer*) file.rdbuf(); // a "way" to the protected methods
  Buf->sgetc(); // a "way" to fill the buffer (the file will be read)

  char* pCharBeg = Buf->Beg();
  char* pCharEnd = Buf->End();

  reverse_iterator<char*> rIter(pCharEnd);

  while (pCharBeg <= &(*rIter)) {
    cout << *(rIter++);
  }

  file.close();
  
  return getchar();
}