The class Regular_triangulation_filtered_traits_2<FK> is designed as a traits class for the class Regular_triangulation_2<RegularTriangulationTraits_2,TriangulationDataStructure_2>. Its difference with Regular_triangulation_euclidean_traits_2 is that it provides filtered predicates which are meant to be fast and exact.
The first argument FK must be a model of the Kernel concept, and it is also restricted to be a instance of the Filtered_kernel template.
#include <CGAL/Regular_triangulation_filtered_traits_2.h>
CGAL::Regular_triangulation_euclidean_traits_2.