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#include <CGAL/HalfedgeDS_default.h>
#include <CGAL/HalfedgeDS_decorator.h>
#include <CGAL/N_step_adaptor.h>
#include <cassert>
struct Traits { typedef int Point_2; };
typedef CGAL::HalfedgeDS_default<Traits> HDS;
typedef CGAL::HalfedgeDS_decorator<HDS> Decorator;
typedef HDS::Halfedge_iterator Halfedge_iterator;
typedef CGAL::N_step_adaptor< Halfedge_iterator, 2> Iterator;
int main() {
HDS hds;
Decorator decorator(hds);
decorator.create_loop();
decorator.create_segment();
assert( decorator.is_valid());
int n = 0;
for ( Iterator e = hds.halfedges_begin(); e != hds.halfedges_end(); ++e)
++n;
assert( n == 2); // == 2 edges
return 0;
}
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