CGAL users discussion list

[Andreas Fabri <>]

Hi Matthias,

Damian is right. The value_type of the CDTplus::Subconstraint_iterator
is  std::pair< std::pair<Vertex_handle, Vertex_handle>, undocumentedClass >
so  it->first.first and it->first.second do the job.

We will fix the code, as the manual is right.

andreas



Damian Sheehy wrote:
> Hi Matthias,
>
> I believe it's a bug in the documentation.
> Can someone from the CGAL dev team confirm?
>
> Try this. . . .
>
> CDTplus::Vertex_handle v1, v2;
>
> for (CDTplus::Subconstraint_
> iterator c_it = cdt.subconstraints_begin(); c_it != 
> cdt.subconstraints_end(); ++c_it)
> {
>         v1 = c_it->first.first;
>         v2 = c_it->first.second;
> }
>
>
> Regards,
>
> Damian
>
>
> On Mon, May 11, 2009 at 6:40 AM, Matthias Teich < 
> <mailto:>> wrote:
>
>     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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>
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