Function transcode_to_8

include/boost/parser/detail/text/transcode_algorithm.hpp:158–170

        template<bool UseN, typename Iter, typename Sentinel, typename OutIter>
        transcode_result<Iter, OutIter> transcode_to_8(
            tag_t<format::utf8>,
            Iter first,
            Sentinel last,
            std::ptrdiff_t n,
            OutIter out)
        {
            for (; first != last && (!UseN || n); ++first, ++out) {
                *out = *first;
                --n;
            }
            return {first, out};
        }

        template<bool UseN, typename Iter, typename Sentinel, typename OutIter>
        transcode_result<Iter, OutIter> transcode_to_16(