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39 bj 1 
#include "HalfEdge.h"
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#include "Manifold.h"
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using namespace CGLA;
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namespace HMesh
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{
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	template<class R>
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	HalfEdge_template<R>::HalfEdge_template():
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		vert(NULL_VERTEX_ITER),
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		next(NULL_HALFEDGE_ITER),
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		prev(NULL_HALFEDGE_ITER),
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		face(NULL_FACE_ITER),
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		opp(NULL_HALFEDGE_ITER),
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		touched(0)
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	{}
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	bool is_boundary(HalfEdgeIter h)
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	{
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		return h->face == NULL_FACE_ITER || h->opp->face == NULL_FACE_ITER;
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	}
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	void link(HalfEdgeIter h0, HalfEdgeIter h1)
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	{
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		h0->next = h1;
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		h1->prev = h0;
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	}
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	void glue(HalfEdgeIter h0, HalfEdgeIter h1)
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	{
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		h0->opp = h1;
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		h1->opp = h0;
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	}
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	float length(HalfEdgeIter h)
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	{
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		return (h->vert->pos-h->opp->vert->pos).length();
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	}
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}