Periodic_3TriangulationDSVertexBase

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Periodic_3TriangulationDSVertexBase_3

At the base level of 3D-triangulations (see Sections 39.5 and 38.2), a vertex provides access to one of its incident cells through a handle.

For optimization purposes we need to extend the concept TriangulationDSVertexBase_3 as follows.

TriangulationDSVertexBase_3

Periodic_3TriangulationDSVertexBase_3 needs to store an offset and some index inside the vertex.

Periodic_3TriangulationDSVertexBase_3::Periodic_3_offset_3
	A model of the concept Periodic_3Offset_3

Periodic_3_offset_3	v.offset ()	Returns the offset stored in the vertex.
bool	v.get_offset_flag ()	Returns true if the offset has been set, false otherwise.
void	v.set_offset ( Periodic_3_offset_3 o)
		Sets the offset and sets the offset flag to true.
void	v.clear_offset ()	Sets the offset flag to false and clears the offset.