CGAL 5.1.3  3D Mesh Generation

#include <CGAL/Compact_mesh_cell_base_3.h>
The class Compact_mesh_cell_base_3<Gt, MD>
is a model of the concept MeshCellBase_3
.
It is designed to serve as cell base class for the 3D triangulation used in the 3D mesh generation process. It is more compact in memory than Mesh_cell_base_3
.
Gt  is the geometric traits class. It has to be a model of the concept MeshTriangulationTraits_3 . 
MD  provides the types of indices used to identify the faces of the input complex. It has to be a model of the concept MeshDomain_3 . 
Tds  is the triangulation data structure class to which cells belong. That parameter is only used by the rebind mechanism (see TriangulationDSCellBase_3::Rebind_TDS ). Users should always use the default parameter value void . 
CGAL::Mesh_complex_3_in_triangulation_3<Tr,CornerIndex,CurveIndex>
CGAL::Mesh_cell_base_3<Gt, MD, Cb>