CGAL users discussion list

[s_gandhi <>]

I am interested in CGAL's source code of few functions. 
Especially, I am not able to understand "how k.<function>_object() works?"

For instance, lets consider example of a function
/collinear_are_ordered_along_line()/

I managed to dig it till:
    Definition at line 254 of file global_functions_2.h.
        261 template < class K >
        262 inline
        263 typename K::Boolean
        264 collinear_are_strictly_ordered_along_line(const Point_2<K> &p,
        265                                           const Point_2<K> &q,
        266                                           const Point_2<K> &r)
        267 {
        268   return internal::collinear_are_strictly_ordered_along_line(p,
q, r, K());
        269 }
        270 

        Further, in global_functions_internal_2.h:253, I find the following:
              250 template < class K >
              251 inline
              252 typename K::Boolean
              253 collinear_are_ordered_along_line(const typename K::Point_2
&p,
              254                                  const typename K::Point_2
&q,
              255                                  const typename K::Point_2
&r,
              256                                  const K& k)
              257 {
              258   return k.collinear_are_ordered_along_line_2_object()(p,
q, r);
              259 }
        Now, where is this function
"collinear_are_ordered_along_line_2_object(...)" defined with respect to
trait k?

Why I want to understand it?
1. Unless I see it till the end, the comfort level does not really arise.
2. I am interested in researching few terminologies in CG. I am willing to
contribute to CG community. So unless I understand how things are at present
- /in practical/ - it is difficult to even think of something else. 
                           
I hope question is not vague and can be answered.

Regards,
S. Gandhi




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