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The function remove_edge removes an edge given by one of the twin halfedges that forms it, from a given arrangement. Once the edge is removed, if the vertices associated with its endpoints become isolated, they are removed as well. The call remove_edge(arr, e) is equivalent to the call arr.remove_edge (e, true, true). However, this free function requires that Traits be a model of the refined concept ArrangementXMonotoneTraits_2, which requires merge operations on -monotone curves. If one of the end-vertices of the given edge becomes redundant after the edge is removed (see remove_vertex() for the definition of a redundant vertex), it is removed, and its incident edges are merged. If the edge-removal operation causes two faces to merge, the merged face is returned. Otherwise, the face to which the edge was incident before the removal is returned.
#include <CGAL/Arrangement_2.h>
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