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    CGAL 4.7 - 2D Arrangements 
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#include <CGAL/Arr_circular_line_arc_traits_2.h>
This class is a traits class for CGAL arrangements, built on top of a model of concept CircularKernel. 
It provides curves that can be of both types CGAL::Line_arc_2<CircularKernel> or CGAL::Circular_arc_2<CircularKernel>.
It uses the boost::variant.