From 7a65d0bace24f3d33962d3eeeef37d76ec0d4964 Mon Sep 17 00:00:00 2001
From: Peter Munch <peterrmuench@gmail.com>
Date: Wed, 1 Sep 2021 22:56:23 +0200
Subject: [PATCH] Implement PreconditionMG::get_multigrid()

---
 include/deal.II/multigrid/multigrid.h | 28 +++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/include/deal.II/multigrid/multigrid.h b/include/deal.II/multigrid/multigrid.h
index 2d7cdba9a3..b1d262443e 100644
--- a/include/deal.II/multigrid/multigrid.h
+++ b/include/deal.II/multigrid/multigrid.h
@@ -589,6 +589,18 @@ public:
   boost::signals2::connection
   connect_transfer_to_global(const std::function<void(bool)> &slot);
 
+  /**
+   * Return the Multigrid object passed to the constructor.
+   */
+  Multigrid<VectorType> &
+  get_multigrid();
+
+  /**
+   * Return the Multigrid object passed to the constructor.
+   */
+  const Multigrid<VectorType> &
+  get_multigrid() const;
+
 private:
   /**
    * Associated @p DoFHandler.
@@ -963,6 +975,22 @@ PreconditionMG<dim, VectorType, TRANSFER>::Tvmult_add(
   Assert(false, ExcNotImplemented());
 }
 
+
+template <int dim, typename VectorType, class TRANSFER>
+Multigrid<VectorType> &
+PreconditionMG<dim, VectorType, TRANSFER>::get_multigrid()
+{
+  return *this->multigrid;
+}
+
+
+template <int dim, typename VectorType, class TRANSFER>
+const Multigrid<VectorType> &
+PreconditionMG<dim, VectorType, TRANSFER>::get_multigrid() const
+{
+  return *this->multigrid;
+}
+
 #endif // DOXYGEN
 
 DEAL_II_NAMESPACE_CLOSE
-- 
2.39.5