boost::text::v1::normalize_append
// In header: <boost/text/normalize_string.hpp> template<nf Normalization, code_point_range R, utf_string String> void normalize_append(R && r, String & s);
Appends r in normalization form Normalization to s. The output is UTF-8 if sizeof(*s.begin()) == 1, and UTF-16 otherwise.
r
Normalization
s
sizeof(*s.begin()) == 1