[Dune] Boundary conditions

[Arne Rekdal]

Hello

I have trided to implement a simple FEM solver based on DUNE. I am  
solving the Poisson equation.

I have some problems understanding how the boundary and the boundary  
conditions should be specified. I see the BoundaryConditions class in  
dune-disc, but how can these flags be associated with the vertices in  
the grid?

Is there also a Iterator that can iterate over boundary entities (vertices)?


Best regards
Arne Rekdal