CGAL 6.0.2 - 2D Arrangements

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ArrangementClosedLeftTraits_2 Concept Reference
2D Arrangement Reference » Concepts » Geometry Traits Concepts

## Definition

A model of the concept `ArrangementClosedLeftTraits_2` must be used when the parameter space of the surface, the arrangement is embedded on, is closed on the left side and curves inserted into the arrangement are expected to reach this boundary side. A model of this concept can handle curves that reach the left boundary side when it is closed.

Refines
  `ArrangementLeftSideTraits_2`

See also
  `ArrangementClosedRightTraits_2`, `ArrangementClosedBottomTraits_2`, `ArrangementClosedTopTraits_2`, `ArrangementOpenLeftTraits_2`, `ArrangementContractedLeftTraits_2`, and `ArrangementIdentifiedVerticalTraits_2`,

## Categories
typedef unspecified_type | Left_side_category
| Must be convertible to `CGAL::Arr_closed_side_tag`.

## Functor Types
typedef unspecified_type | Compare_y_on_boundary_2
| models the concept `ArrTraits::CompareYOnBoundary_2`.

## Accessing Functor Objects
Compare_y_on_boundary_2 | compare_y_on_boundary_2_object () const