42class SpanPixelIterator :
public boost::iterator_facade<SpanPixelIterator, lsst::geom::Point2I const,
43 boost::random_access_traversal_tag> {
56 lsst::geom::Point2I const& dereference()
const {
return _p; }
58 void increment() { ++_p.getX(); }
60 void decrement() { --_p.getX(); }
62 void advance(
int n) { _p.getX() += n; }
65 return _p.getX() == other._p.getX() && _p.getY() == other._p.getY();
69 assert(other._p.getY() == _p.getY());
70 return other._p.getX() - _p.getX();