Method base

external/utf8/unchecked.h:244–244

the default "big three" are OK

            explicit iterator (const octet_iterator& octet_it): it(octet_it) {}
            // the default "big three" are OK
            octet_iterator base () const { return it; }
            utfchar32_t operator * () const
            {
                octet_iterator temp = it;