Method operator-

pdal/PointView.hpp:609–610

    PointViewIter operator+=(const difference_type& n)
        { m_id += n; return *this; }
    PointViewIter operator-(const difference_type& n) const
        { return PointViewIter(m_view, m_id - n); }
    PointViewIter operator-=(const difference_type& n)
        { m_id -= n; return *this; }
    difference_type operator-(const PointViewIter& i) const