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		bool failed_flag;
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			bool failed_flag;
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	public:
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		public:
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			/** Construct a vertex circulator from a vertex.
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					This constructor creates a vertex circulator which starts at a random
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					point in the one ring. */
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		VertexCirculator(VertexIter v):
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			VertexCirculator(VertexIter v):
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			last(v->he),
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				last(v->he),
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				 he(last),
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				he(last),
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				 steps(0),
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				steps(0),
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				 failed_flag(false)
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				failed_flag(false)
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		{
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				{
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			assert(v->he != NULL_HALFEDGE_ITER);
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					assert(v->he != NULL_HALFEDGE_ITER);
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		}
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				}
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			/** Construct a vertex circulator from a halfedge.
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					This constructor creates a vertex circulator which circles the
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					halfedge from which h emanates (i.e. h->opp->vert).
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					The circulator starts at the position indicated by h. */
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			VertexCirculator(HalfEdgeIter h):
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				last(h),
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				he(last),
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				steps(0),
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				failed_flag(false)
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				{
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					assert(h != NULL_HALFEDGE_ITER);
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				}
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		/// Get current halfedge
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			/// Get current halfedge
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		HalfEdgeIter get_halfedge() const { return he;}
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			HalfEdgeIter get_halfedge() const { return he;}
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		/// Get current vertex, i.e. the vertex pointed to by current halfege
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			/// Get current vertex, i.e. the vertex pointed to by current halfege
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		VertexIter get_vertex() const { return he->vert;}
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			VertexIter get_vertex() const { return he->vert;}
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		/// Get opposite halfedge, i.e. the one pointing towards us.
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			/// Get opposite halfedge, i.e. the one pointing towards us.
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		HalfEdgeIter get_opp_halfedge() const { return he->opp;}
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			HalfEdgeIter get_opp_halfedge() const { return he->opp;}
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		/// Get the face of the current halfedge.
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			/// Get the face of the current halfedge.
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		FaceIter get_face() const { return he->face;}
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			FaceIter get_face() const { return he->face;}