CGAL users discussion list

[Shriramana Sharma <>]

In this connection I also have some queries regarding the lines which
are found in the example bezier_traits_adapter.cpp:

typedef CGAL::Gps_traits_2<Traits_2>                    Gps_traits_2;
typedef Gps_traits_2::General_polygon_2                 Polygon_2;
typedef Gps_traits_2::General_polygon_with_holes_2      Polygon_with_holes_2;
typedef std::list<Polygon_with_holes_2>                 Polygon_set;

1)

a) Whether CGAL::General_polygon_set_2<Traits_2> cannot be used in the
place of the last line?

b) Or perhaps should CGAL::General_polygon_set_2<Gps_traits_2> be used?

c) What is the difference between Gps_traits_2 and Traits_2?

2) In the previous example the lines:

typedef CGAL::General_polygon_set_2<Traits_2>             Polygon_set_2;
typedef Traits_2::General_polygon_2                       Polygon_2;
typedef Traits_2::General_polygon_with_holes_2            
Polygon_with_holes_2;

... are seen so why in this example the typedefs of Polygon and
Polygon_with_holes are done from Gps_traits_2 and not Traits_2
directly? (This connects with 1b and 1c above.)

3) Why isn't there a consistent interface:

typedef CGAL::General_polygon_2<Traits_2>             Polygon_2;
typedef CGAL::General_polygon_with_holes_2<Traits_2>
Polygon_with_holes_2;
typedef CGAL::General_polygon_set_2<Traits_2>             Polygon_set_2;

but Polygon_set_2 is always initialized from the template with the
traits class as parameter and the other two are instead typedef-ed
from a member type of the traits class?

-- 
Shriramana Sharma