CGAL users discussion list

[Stefan Schirra <>]

On 03/29/2014 03:54 PM, Ranjana Shevkar wrote:
> hello,
> 
> I am using CGAL4.2_beta1 on Win XP. I am trying to calculate points on
> convex hull using bykat, akl_toussaint and jarvis algorithms. for
> bykat while executing for Random circular distribution 8192 points,
> following run time error is there
> 
> 
> CGAL error: postcondition violation!
> Expression : is_ccw_strongly_convex_2(
> res.output_so_far_begin(),res.output_so_far_end(),ch_traits)
> File       : C:\Program
> Files\CGAL-4.2-beta1\include\CGAL/Convex_hull_2/ch_bykat_impl.h
> Line       : 109
> Explanation:
> Refer to the bug-reporting instructions at 
> http://www.cgal.org/bug_report.html
> 
> for jarvis , same error is given for all points.
> 
> for akl_toussaint there is an error : compatibility between input and
> output iterator to forwarditerator.


Which kernel do you use?

Regards,

        Stefan