Surface_mesh/sm_circulators.cpp

#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
 
#include <vector>
 
typedef CGAL::Simple_cartesian<double> K;
typedef CGAL::Surface_mesh<K::Point_3> Mesh;
typedef Mesh::Vertex_index vertex_descriptor;
typedef Mesh::Face_index face_descriptor;
 
int main()
{
  Mesh m;
 
  // u            x
  // +------------+
  // |            |
  // |            |
  // |      f     |
  // |            |
  // |            |
  // +------------+
  // v            w
 
  // Add the points as vertices
  vertex_descriptor u = m.add_vertex(K::Point_3(0,1,0));
  vertex_descriptor v = m.add_vertex(K::Point_3(0,0,0));
  vertex_descriptor w = m.add_vertex(K::Point_3(1,0,0));
  vertex_descriptor x = m.add_vertex(K::Point_3(1,1,0));
 
  face_descriptor f = m.add_face(u,v,w,x);
 
  {
    std::cout << "vertices around vertex " << v << std::endl;
    CGAL::Vertex_around_target_circulator<Mesh> vbegin(m.halfedge(v),m), done(vbegin);
 
    do {
      std::cout << *vbegin++ << std::endl;
    } while(vbegin != done);
  }
 
  {
    std::cout << "vertices around face " << f << std::endl;
    CGAL::Vertex_around_face_iterator<Mesh> vbegin, vend;
    for(std::tie(vbegin, vend) = vertices_around_face(m.halfedge(f), m);
        vbegin != vend;
        ++vbegin){
      std::cout << *vbegin << std::endl;
    }
  }
 
  // or the same again, but directly with a range based loop
  for(vertex_descriptor vd : vertices_around_face(m.halfedge(f), m)){
    std::cout << vd << std::endl;
  }
 
 
  return 0;
}