CGAL 2D and 3D Kernel Reference Manual:

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Kernel::ConstructOppositeTriangle_2

A model for this must provide:

Kernel::Triangle_2 fo.operator() ( Kernel::Triangle_2 t)
returns the triangle with opposite orientation to t (this flips the positive and the negative side, but not bounded and unbounded side).

AdaptableFunctor

Kernel::Triangle_2	fo.operator() ( Kernel::Triangle_2 t)
		returns the triangle with opposite orientation to t (this flips the positive and the negative side, but not bounded and unbounded side).