CGAL users discussion list

[Matthias Teich <>]

Hi again!

I am still looking for a way to retrieve the vertex_handles from a 
subconstraint in a constrained triangluation plus.

Any hints are really appreciated.

Best Regards,
Matthias


Matthias schrieb:
> 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>        ]
>
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