Function prior

include/utf8cpp/unchecked.h:98–103

        template <typename octet_iterator>
        uint32_t prior(octet_iterator& it)
        {
            while (utf8::internal::is_trail(*(--it))) ;
            octet_iterator temp = it;
            return utf8::unchecked::next(temp);
        }

        // Deprecated in versions that include prior, but only for the sake of consistency (see utf8::previous)
        template <typename octet_iterator>