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The class Alpha_shape_face_base_2<Traits, Fb, ExactAlphaComparisonTag> is the default model for the concept AlphaShapeFace_2.
#include <CGAL/Alpha_shape_face_base_2.h>
The template parameter Fb has to be a model of TriangulationFaceBase_2 (or RegularTriangulationFaceBase_2) if Alpha_shape_face_base_2<Traits, Fb, ExactAlphaComparisonTag> is intended to be used with an alpha-shape class based on a Delaunay_triangulation_2 (or a Regular_triangulation_2).
The template parameter ExactAlphaComparisonTag is a tag that, when set to CGAL::Tag_true, triggers exact comparisons between alpha values. See the description provided in the documentation of Alpha_shape_2 for more details. The default value is CGAL::Tag_false.
Fb