Function distance

include/boost/parser/detail/text/algorithm.hpp:24–27

    namespace detail {
        template<typename Iter>
        std::ptrdiff_t distance(Iter first, Iter last, non_sentinel_tag)
        {
            return std::distance(first, last);
        }

        template<typename Iter, typename Sentinel>
        std::ptrdiff_t distance(Iter first, Sentinel last, sentinel_tag)