Hi

I am trying to extract all degrees of freedom which are at the boundary and 
belong to specified components using DoFTools::extract_boundary_dofs() 
function and IndexSet for a parallel distributed triangulation. Now, how I 
can iterate over the IndexSet and how I can access to the Dof index in it?

Something like this:

    dealii::IndexSet::ElementIterator     index = in_set.begin(),     endind 
= in_set.end();

     for (; index!=endind; ++index)
     {
     how to access to dof index here?
     }

Thank you

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