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Arr_open_side_tag is an empty construct used for dispatching functions based on type of curves that induce the arrangement. If some curves are expected to approach the left, right, bottom, or top sides of the boundary of the parameter space, the categories Arr_left_side_category, Arr_right_side_category, Arr_bottom_side_category, and Arr_top_side_category, nested in any model of the ArrangementBasicTraits_2, must be defined as Arr_open_side_tag, respectively.
#include <CGAL/Arr_tags.h>