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Roland Levillain authored
* mln/topo/n_face_iter.hh (mln::n_face_fwd_iter<D>::invalidate_face_id_) (mln::n_face_bkd_iter<D>::invalidate_face_id_): New methods. (mln::n_face_fwd_iter<D>::next_) (mln::n_face_bkd_iter<D>::next_): Use it here, instead of invalidate(). (mln::n_face_fwd_iter<D>::start_): Don't set n_. git-svn-id: https://svn.lrde.epita.fr/svn/oln/branches/cleanup-2008@2680 4aad255d-cdde-0310-9447-f3009e2ae8c0
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