CGAL 5.0 - 2D and 3D Linear Geometry Kernel
Kernel::LessXY_3 Concept Reference

## Definition

Refines:
AdaptableFunctor (with two arguments)
CGAL::compare_xy()
returns true iff the $$x$$-coordinate of p is smaller than the $$x$$-coordinate of q or if the are the same and the $$y$$-coordinate of p is smaller than the $$y$$-coordinate of q.