missing git add

Constrained_triangulation_3/examples/Constrained_triangulation_3/ccdt_3_check_preconditions.cpp

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+#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
+
+#include <CGAL/Surface_mesh/Surface_mesh.h>
+#include <CGAL/make_conforming_constrained_Delaunay_triangulation_3.h>
+
+#include <CGAL/draw_constrained_triangulation_3.h>
+
+using K = CGAL::Exact_predicates_inexact_constructions_kernel;
+using Point = K::Point_3;
+using Surface_mesh = CGAL::Surface_mesh<Point>;
+
+namespace PMP = CGAL::Polygon_mesh_processing;
+
+int main(int argc, char* argv[])
+{
+  const auto filename = (argc > 1) ? argv[1]
+                       : CGAL::data_file_path("meshes/mpi_and_sphere.off");
+
+  CGAL::Surface_mesh<K::Point_3> mesh;
+  std::ifstream in(filename);
+  if(!in || !(in >> mesh)) {
+    std::cerr << "Error: cannot read file " << filename << std::endl;
+    return EXIT_FAILURE;
+  }
+
+  std::cout << "Number of facets in " << filename << ": "
+            << mesh.number_of_faces() << "\n";
+
+  auto ccdt = CGAL::make_conforming_constrained_Delaunay_triangulation_3(mesh,
+                CGAL::parameters::check_preconditions(true));
+
+  if(ccdt.number_of_constrained_facets() == 0)
+  {
+    std::cerr << "Error: no constrained facets in the CDT.\n";
+    std::cerr << "Checking preconditions has failed.\n";
+    return EXIT_SUCCESS;
+  }
+
+  std::cout << "Number of constrained facets in the CDT: "
+            << ccdt.number_of_constrained_facets() << '\n';
+
+  CGAL::draw(ccdt);
+
+  return EXIT_SUCCESS;
+}