CGAL users discussion list

[s_gandhi <>]

s_gandhi wrote
> 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 
> 
>        This part should be different, I made a mistake while copy-pasting.
> Pl find below:
>          251 template < class K >
>          252 inline
>          253 typename K::Boolean
>          254 collinear_are_ordered_along_line(const Point_2
> <K>
>  &p,
>          255                                  const Point_2
> <K>
>  &q,
>          256                                  const Point_2
> <K>
>  &r)
>          257 {
>          258   return internal::collinear_are_ordered_along_line(p, q, r,
> K());
>          259 }
> 
>         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


s_gandhi wrote
> 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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