CGAL 5.1.3 - 2D and 3D Linear Geometry Kernel
Kernel::CompareX_2 Concept Reference

## Definition

Refines:
AdaptableFunctor (with two arguments)
CGAL::compare_x()

## Operations

A model of this concept must provide:

Comparison_result operator() (const Kernel::Point_2 &p, const Kernel::Point_2 &q)
compares the Cartesian $$x$$-coordinates of points p and q

Comparison_result operator() (const Kernel::Point_2 &p, const Kernel::Line_2 &l1, const Kernel::Line_2 &l2)
compares the $$x$$-coordinates of p and the intersection of lines l1 and l2. More...

Comparison_result operator() (const Kernel::Line_2 &l, const Kernel::Line_2 &h1, const Kernel::Line_2 &h2)
compares the x-coordinates of the intersection of line l with line h1 and with line h2. More...

Comparison_result operator() (const Kernel::Line_2 &l1, const Kernel::Line_2 &l2, const Kernel::Line_2 &h1, const Kernel::Line_2 &h2)
compares the $$x$$-coordinates of the intersection of lines l1 and l2 and the intersection of lines h1 and h2. More...

## ◆ operator()() [1/3]

 Comparison_result Kernel::CompareX_2::operator() ( const Kernel::Point_2 & p, const Kernel::Line_2 & l1, const Kernel::Line_2 & l2 )

compares the $$x$$-coordinates of p and the intersection of lines l1 and l2.

See Figure fig-compare12 (a).

## ◆ operator()() [2/3]

 Comparison_result Kernel::CompareX_2::operator() ( const Kernel::Line_2 & l, const Kernel::Line_2 & h1, const Kernel::Line_2 & h2 )

compares the x-coordinates of the intersection of line l with line h1 and with line h2.

See Figure fig-compare12 (b).

## ◆ operator()() [3/3]

 Comparison_result Kernel::CompareX_2::operator() ( const Kernel::Line_2 & l1, const Kernel::Line_2 & l2, const Kernel::Line_2 & h1, const Kernel::Line_2 & h2 )

compares the $$x$$-coordinates of the intersection of lines l1 and l2 and the intersection of lines h1 and h2.

See Figure fig-compare12 (c).