boost::text::operator+
// In header: <boost/text/unencoded_rope.hpp> template<typename Char, typename String, typename T> basic_unencoded_rope< Char, String > operator+(basic_unencoded_rope< Char, String > ur, T const & x);
Creates a new object that is the concatenation of basic_unencoded_ropet and some object x for which ur = x is well-formed.