CGAL users discussion list

[DANIEL DUQUE CAMPAYO <>]

Hi everyone,

I am having trouble starting vertex circulators
at some determined vertex. I have implemented
a vertex class that contains a handle to another vertex,
exactly as described in [1]. This handle points to
an incident vertex. Now, it would be convenient for me
to just do:

   Vertex_circulator vc= v0->get_ne(),
      done(vc);

instead of the usual

   Vertex_circulator vc= T.incident_vertices(v0),
      done(vc);

[The class function get_ne() returns v0's handle.]

Now, that does not seem to work (it does compile). Probably casting 
from
a vertex circulator to a handle is ok, but the reverse is not.

My next trial was to circulate in order to find the right vertex:

   Vertex_circulator vc= T.incident_vertices(v0),
      done(vc);
   Vertex_handle ne=v0->get_ne();
      // // Advance circulator to coincide with ne
   do{
        if(vc==ne) break;
   } while (++vc!=done);

But this also seems to fail (it also compiles). Is it also wrong to 
compare vertex
handles and vertex circulators with ==? Am I missing some *'s or &'s?

Thanks. Best,

Daniel


[1] 
http://www.cgal.org/Manual/latest/examples/Triangulation_2/adding_handles.cpp

--
DANIEL DUQUE CAMPAYO
Universidad Politecnica de Madrid