CGAL users discussion list

[Matthias Teich <>]

Hi!

The documentation says:

"Constrained triangulation plus 2<Tr>:: Subconstraint iterator
An iterator to visit all the sub-constraints of the triangulation.
The order of visit is arbitrary. The value type of this iterator is
a pair std::pair<Vertex handle, Vertex handle> corresponding
to the vertices of the sub-constraint"

So I thought the following should work:

for (CDTplus::Subconstraint_iterator c_it = cdt.subconstraints_begin(); 
c_it != cdt.subconstraints_end(); ++c_it)
{
       std::pair<CDTplus::Vertex_handle,CDTplus::Vertex_handle> pair = 
*c_it;
       // do sth with pair
}

Can anyone explain how I can retrieve the subconstraints?

What follows is the lengthy error message from visual studio:

::CC_iterator<DSC,Const>::CC_iterator(const 
CGAL::CGALi::CC_iterator<DSC,Const> &)' : cannot convert parameter 1 
from 'const std::pair<_Ty1,_Ty2>' to 'const 
CGAL::CGALi::CC_iterator<DSC,Const> &'
1>        with
1>        [
1>            
DSC=CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,
1>            Const=false
1>        ]
1>        and
1>        [
1>            
_Ty1=CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>,
1>            
_Ty2=CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>
1>        ]
1>        and
1>        [
1>            
DSC=CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,
1>            Const=false
1>        ]
1>        Reason: cannot convert from 'const std::pair<_Ty1,_Ty2>' to 
'const CGAL::CGALi::CC_iterator<DSC,Const>'
1>        with
1>        [
1>            
_Ty1=CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>,
1>            
_Ty2=CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>
1>        ]
1>        and
1>        [
1>            
DSC=CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,
1>            Const=false
1>        ]
1>        No user-defined-conversion operator available that can perform 
this conversion, or the operator cannot be called
1>        .\MeshOffsetter.cpp(534) : see reference to function template 
instantiation 'std::pair<_Ty1,_Ty2>::pair<const _Kty,_Ty>(const 
std::pair<const _Kty,_Ty> &)' being compiled
1>        with
1>        [
1>            
_Ty1=CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>,
1>            
_Ty2=CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>,
1>            
_Kty=std::pair<CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>,CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>>,
1>            
_Ty=std::list<CGAL::Constraint_hierarchy_2<CGAL::CGALi::CC_iterator<CGAL::Compact_container<CGAL::Triangulation_vertex_base_2<Kernel,CGAL::Triangulation_ds_vertex_base_2<CGAL::Triangulation_data_structure_2<Vb,Fb>>>>,false>,bool>::H_context> 
*
1>        ]