CGAL 5.6.3 - 2D and 3D Linear Geometry Kernel

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Kernel::CompareAngleWithXAxis_2 Concept Reference
2D and 3D Linear Geometry Kernel Reference » Concepts » Kernel Function Object Concepts

## Definition

Refines
  `AdaptableBinaryFunction`

## Operations
A model of this concept must provide:
Comparison_result | operator() (const Kernel::Direction_2 &d, const Kernel::Direction_2 &e)
| compares the angles between the positive \( x\)-axis and the directions in counterclockwise order.