CGAL 5.6.3 - 2D Arrangements

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ArrTraits::CompareYAtXLeft_2 Concept Reference
2D Arrangement Reference » Concepts » Function Object Concepts

## Definition

Refines
  `AdaptableTernaryFunction`

Has Models:
  ArrangementBasicTraits_2::Compare_y_at_x_left_2

## Operations
A model of this concept must provide:
Comparison_result | operator() (ArrTraits::X_monotone_curve_2 xc1, ArrTraits::X_monotone_curve_2 xc2, ArrTraits::Point_2 p)
| accepts two \(x\)-monotone curves `xc1` and `xc2` that have a common right endpoint `p`, and returns `CGAL::SMALLER, CGAL::EQUAL` or `CGAL::LARGER` according to the relative position of the two curves immediately to the left of \(p\).

## Member Function Documentation

## ◆ operator()()

Comparison_result ArrTraits::CompareYAtXLeft_2::operator() | ( | ArrTraits::X_monotone_curve_2 | xc1,
|  | ArrTraits::X_monotone_curve_2 | xc2,
|  | ArrTraits::Point_2 | p
| ) |  |

accepts two \(x\)-monotone curves `xc1` and `xc2` that have a common right endpoint `p`, and returns `CGAL::SMALLER, CGAL::EQUAL` or `CGAL::LARGER` according to the relative position of the two curves immediately to the left of \(p\).

Note that in case one of the \(x\)-monotone curves is a vertical segment (emanating downward from `p`), it is always considered to be below the other curve.