Method parent_pointer

lesson6-Segmentation/json.hpp:11757–11767

! @brief returns the parent of this JSON pointer @return parent of this JSON pointer; in case this JSON pointer is the root, the root itself is returned @complexity Linear in the length of the JSON pointer. @liveexample{The example shows the result of `parent_pointer` for different JSON Pointers.,json_pointer__parent_pointer} @since version 3.6.0 */

    @since version 3.6.0
    */
    json_pointer parent_pointer() const
    {
        if (empty())
        {
            return *this;
        }

        json_pointer res = *this;
        res.pop_back();
        return res;
    }

    /*!
    @brief remove last reference token