CGAL 2D and 3D Kernel Reference Manual:

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Kernel::ConstructSupportingLine_2

A model for this must provide:

Kernel::Line_2 fo.operator() ( Kernel::Ray_2 r)
returns the line supporting r which has the same direction.

Kernel::Line_2 fo.operator() ( Kernel::Segment_2 s)
returns the line l passing through s. Line l has the same orientation as segment s.

AdaptableFunctor

Kernel::Line_2	fo.operator() ( Kernel::Ray_2 r)
		returns the line supporting r which has the same direction.

Kernel::Line_2	fo.operator() ( Kernel::Segment_2 s)
		returns the line l passing through s. Line l has the same orientation as segment s.