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#include "Vertex.h"
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#include "Vertex.h"
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#include "HalfEdge.h"
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#include "HalfEdge.h"
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#include "Face.h"
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#include "Face.h"
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namespace HMesh
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namespace HMesh
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{
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{
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	class VertexCirculator;
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	class VertexCirculator;
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	class FaceCirculator;
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	class FaceCirculator;
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	/** A Data structure representing an open or closed manifold.
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	/** \brief A Data structure representing an open or closed manifold.
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			Manifold keeps lists of the entities making up a halfedge mesh
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			Manifold keeps lists of the entities making up a halfedge mesh
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			and provides basic functions for creating new faces, halfedges
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			and provides basic functions for creating new faces, halfedges
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			and vertices. There are also primitive operations for editing
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			and vertices. There are also primitive operations for editing
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			such as edge collapse. */
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			such as edge collapse. */
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	struct Manifold
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	struct Manifold
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	{
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	{
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		std::list<Vertex> vertex_db;
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		std::list<Vertex> vertex_db;
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		std::list<Face> face_db;
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		std::list<Face> face_db;
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		std::list<HalfEdge> halfedge_db;
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		std::list<HalfEdge> halfedge_db;
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		/** Remove a face if it contains only two edges. This is an auxiliary
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		/** Remove a face if it contains only two edges.
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				function called from collapse_halfedge. */
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		This is an auxiliary function called from collapse_halfedge. */
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		void remove_face_if_degenerate(HalfEdgeIter fi);
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		void remove_face_if_degenerate(HalfEdgeIter fi);
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		/** Empty copy constructor.
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		/** Copying a manifold will not work, since faces, vertices, and
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		Copying a manifold will not work, since faces, vertices, and
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				halfedges contain iterators pointing to other faces, vertices,
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				halfedges contain iterators pointing to other faces, vertices,
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				and halfedges. These pointers would need to be changed if the
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				and halfedges. These pointers would need to be changed if the
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				mesh were copied. In other words, we would need to walk the
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				mesh were copied. In other words, we would need to walk the
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				entire mesh. This may be required but it should not be an
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				entire mesh. This may be required but it should not be an
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				operation that is easily invoked by calling the copy constructor.
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				operation that is easily invoked by calling the copy constructor.
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				Hence, this operator is made private.		*/
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				Hence, this operator is made private.		*/
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		Manifold(const Manifold& m2) {}
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		Manifold(const Manifold& m2) {}
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		/** Empty assignment operator.
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		/** The assignment operator is private for the same reason that the
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		The assignment operator is private for the same reason that the
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				copy constructor is private. */
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				copy constructor is private. */
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		const Manifold& operator=(const Manifold& m2) {}
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		const Manifold& operator=(const Manifold& m2) {}
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		public:
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		public:
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