Regular_triangulation_euclidean_traits_2<K,Weight> is a model for the concept RegularTriangulationTraits_2 This traits class is templated by a kernel class K and a weight type Weight. This class inherits from K and uses a Weighted_point type derived from the type K::Point_2.
Note that this template class is specialized for CGAL::Exact_predicates_inexact_constructions_kernel, so that it is as if Regular_triangulation_filtered_traits_2 was used, i.e. you get filtered predicates automatically.
#include <CGAL/Regular_triangulation_euclidean_traits_2.h>