return ReadingIterator(fragment, startPos, *this);
return basic_nsAReadableString<CharT>::ReadingIterator(fragment, startPos, *this);
      EndReading( PRUint32 aOffset = 0 ) const        {          ReadableFragment fragment;          const CharT* startPos = GetReadableFragment(fragment, kFragmentAt, NS_MAX(0U, Length()-aOffset));          return ReadingIterator(fragment, startPos, *this);        }