Method operator--

pdal/PointView.hpp:602–603

    PointViewIter& operator--()
        { --m_id; return *this; }
    PointViewIter operator--(int)
        { return PointViewIter(m_view, m_id--); }

    PointViewIter operator+(const difference_type& n) const
        { return PointViewIter(m_view, m_id + n); }