namespace boost {
  namespace text {
    template<typename Char, typename String> struct basic_unencoded_rope_view;
    template<typename Char, typename String> 
      int operator+(basic_unencoded_rope_view< Char, String > lhs, 
                    basic_unencoded_rope_view< Char, String > rhs);
  }
}namespace std {
  namespace ranges {
  }
}