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Hi all,

The Arr_extended_dcel<Traits, VertexData, HalfedgeData, FaceData> class
template allows to associate auxiliary data fields to the DCEL of an
Arrangement_2. My question is how to extend only two of the three records (say
with  VertexData and HalfedgeData) without wasting memory space for the last
record (say FaceData) since it is not needed.

Thanks in advance for your help,
Hichem Barki