operator!=( const nsReadingIterator<CharT>& lhs, const nsReadingIterator<CharT>& rhs ) { return lhs.get() != rhs.get(); }
PRBool  operator!=( const basic_nsAReadableString<CharT>& rhs ) const { return Compare(rhs)!=0; }
operator!=( const nsReadingIterator<CharT>& lhs, const nsReadingIterator<CharT>& rhs )  {    return lhs.get() != rhs.get();  }