Function append

third-party/utf8cpp/source/utf8/unchecked.h:38–41

    {
        template <typename octet_iterator>
        octet_iterator append(uint32_t cp, octet_iterator result)
        {
            return internal::append(cp, result);
        }

        template <typename octet_iterator, typename output_iterator>
        output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out, uint32_t replacement)