CGAL users discussion list

[Matti Lehtonen <>]

Hi,

On 30 April 2013 14:58, Sebastien Loriot (GeometryFactory) <> wrote:

I think you should simply use:

struct Property_map_xy_2
{
     typedef Point_2  value_type;

     typedef value_type reference;

     typedef const Multi_Classified_Point &        key_type;
     typedef boost::readable_property_map_tag    category;
};

with

Property_map_xy_2::reference
get
(
     Property_map_xy_2,
     Property_map_xy_2::key_type        p
)
{

     return Point_2( p.x(), p.y() );
}

Without reference at "typedef value_type reference", but still with const keyword, a core dump is created, while building the tree.

terminate called after throwing an instance of 'CGAL::Assertion_exception'
  what():  CGAL ERROR: assertion violation!
Expr: b = (b && (bbox.min_coord(i) <= tbox.min_coord(i)))
File: /usr/include/CGAL/Point_container.h
Line: 325

 

otherwise, you might use tmp while it was changed.

I used a const reference, so changing should not be possible.

It seems that a tuple version works - inefficiently and with ugly code, but it works.

To the wish list:

* e.g. CGAL::Distance_xy_3 could be used similarly like CGAL::Triangulation_euclidean_traits_xy_3, which allows use of 3D points for 2D triangulation

Matti L

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