CircularKernel::ConstructLineArc_2

A model fo of this type must provide:

CircularKernel::Line_arc_2
	fo ( CircularKernel::Line_2 l, CircularKernel::Circular_arc_point_2 p1, CircularKernel::Circular_arc_point_2 p2)
		Constructs the line segment supported by l, whose source is p1 and whose target is p2. Precondition: p1 and p2 lie on l.
CircularKernel::Line_arc_2
	fo ( CircularKernel::Segment_2 s)
CircularKernel::Line_arc_2
	fo ( CircularKernel::Point_2 p1, CircularKernel::Point_2 p2)
CircularKernel::Line_arc_2
	fo ( CircularKernel::Line_2 l, CircularKernel::Circle_2 c1, bool b1, CircularKernel::Circle_2 c2, bool b2)
		Constructs the line segment whose supporting line is l, whose source endpoint is the $$b1th intersection of l with c1, and whose target endpoint is the $$b2th intersection of l and c2, where intersections are ordered lexicographically. Precondition: l intersects both c1 and c2, and the arc defined by the intersections has non-zero length.
CircularKernel::Line_arc_2
	fo ( CircularKernel::Line_2 l, CircularKernel::Line_2 l1, CircularKernel::Line_2 l2)
		Same, for intersections defined by lines instead of circles.