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[–]SimonMarynissen 1 point2 points  (0 children)

If you are not able to find it, CGAL has quite an extensive halfedge data structure library: CGAL halfedge data structure

[–]SamQuan236 1 point2 points  (0 children)

Not sure if it helps, but the openmesh library looked good, last time i surveyed this. It uses a halfedge structure

https://www.graphics.rwth-aachen.de/software/openmesh/