12 // quoted
22 // quoted is C++14 only
38     ss << std::quoted(sv);  in round_trip()
40     ss >> std::quoted(s);  in round_trip()
51     ss << std::quoted(sv);  in round_trip_ws()
53     ss >> std::quoted(s);  in round_trip_ws()
62     ss << std::quoted(sv, delim);  in round_trip_d()
64     ss >> std::quoted(s, delim);  in round_trip_d()
72     ss << std::quoted(sv, '"', escape );  in round_trip_e()
74     ss >> std::quoted(s, '"', escape );  in round_trip_e()
82     ss << std::quoted(p, delim, escape);  in quote()
92     ss >> std::quoted(s, delim, escape);  in unquote()
102     ss << std::quoted(sv);  in round_trip()
104     ss >> std::quoted(s);  in round_trip()
116     ss << std::quoted(sv);  in round_trip_ws()
118     ss >> std::quoted(s);  in round_trip_ws()
127     ss << std::quoted(sv, delim);  in round_trip_d()
129     ss >> std::quoted(s, delim);  in round_trip_d()
137     ss << std::quoted(sv, wchar_t('"'), escape );  in round_trip_e()
139     ss >> std::quoted(s, wchar_t('"'), escape );  in round_trip_e()
148     ss << std::quoted(sv, delim, escape);  in quote()
160     ss >> std::quoted(s, delim, escape);  in unquote()