CGAL 6.1.1 - 2D and 3D Linear Geometry Kernel

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Kernel::ConstructOppositeDirection_2 Concept Reference
Reference Manual » Concepts » Kernel Function Object Concepts

## Definition

Refines
  `AdaptableUnaryFunction`

See also
  `CGAL::Direction_2<Kernel>`

## Operations
A model of this concept must provide:
Kernel::Direction_2 | operator() (const Kernel::Direction_2 &d)
| returns the direction opposite to `d`.