CGAL 4.7 - 2D and 3D Linear Geometry Kernel
Kernel::LessXYZ_3 Concept Reference

## Definition

Refines:
AdaptableFunctor (with two arguments)
CGAL::lexicographically_xyz_smaller()
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, or, if both $$x$$- and $$y$$- coordinate are identical and the $$z$$-coordinate of p is smaller than the $$z$$-coordinate of q.