Add necessary forward declarations.

git-svn-id: https://svn.dealii.org/trunk@13077 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/deal.II/include/multigrid/mg_dof_iterator_selector.h b/deal.II/deal.II/include/multigrid/mg_dof_iterator_selector.h
index c46d1047c2a554a4685eb627ae984a3c67177cec..1b789736a141bda3ae6ffd8c24be1dd4b76af54f 100644 (file)
--- a/deal.II/deal.II/include/multigrid/mg_dof_iterator_selector.h
+++ b/deal.II/deal.II/include/multigrid/mg_dof_iterator_selector.h
@@ -24,6 +24,10 @@ template <int dim>              class MGDoFObjectAccessor<2, dim>;
 template <int dim>              class MGDoFObjectAccessor<3, dim>;
 template <int dim> class MGDoFCellAccessor;
 
+template <int dim, typename Accessor> class TriaRawIterator;
+template <int dim, typename Accessor> class TriaIterator;
+template <int dim, typename Accessor> class TriaActiveIterator;
+
 
 namespace internal
 {