Method json_reverse_iterator

RedEdrShared/json.hpp:13711–13713

create reverse iterator from iterator

        /// create reverse iterator from iterator
        explicit json_reverse_iterator(const typename base_iterator::iterator_type& it) noexcept
            : base_iterator(it) {
        }

        /// create reverse iterator from base class
        explicit json_reverse_iterator(const base_iterator& it) noexcept : base_iterator(it) {}