From: Denis Davydov <davydden@gmail.com>
Date: Tue, 30 May 2017 09:42:09 +0000 (+0200)
Subject: add mg::Matrix::reset() and MGCoarseGridApplySmoother::clear()
X-Git-Tag: v9.0.0-rc1~1557^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bbb9d42ef8a0a3f74f67cf34685d8c5b8d6b3163;p=dealii.git

add mg::Matrix::reset() and MGCoarseGridApplySmoother::clear()
---

diff --git a/include/deal.II/multigrid/mg_coarse.h b/include/deal.II/multigrid/mg_coarse.h
index b14c4c74c1..0fc198aac0 100644
--- a/include/deal.II/multigrid/mg_coarse.h
+++ b/include/deal.II/multigrid/mg_coarse.h
@@ -47,6 +47,11 @@ public:
    */
   MGCoarseGridApplySmoother (const MGSmootherBase<VectorType> &coarse_smooth);
 
+  /**
+   * Clear the pointer.
+   */
+  void clear ();
+
   /**
    * Initialize new data.
    */
@@ -329,6 +334,15 @@ MGCoarseGridApplySmoother<VectorType>::initialize (const MGSmootherBase<VectorTy
     (&coarse_smooth_,typeid(*this).name());
 }
 
+
+template<class VectorType>
+void
+MGCoarseGridApplySmoother<VectorType>::clear()
+{
+  coarse_smooth = nullptr;
+}
+
+
 template<class VectorType>
 void
 MGCoarseGridApplySmoother<VectorType>::operator() (const unsigned int level,
diff --git a/include/deal.II/multigrid/mg_matrix.h b/include/deal.II/multigrid/mg_matrix.h
index ec6c7b7eac..a717e34e88 100644
--- a/include/deal.II/multigrid/mg_matrix.h
+++ b/include/deal.II/multigrid/mg_matrix.h
@@ -64,6 +64,11 @@ namespace mg
     void
     initialize(const MGLevelObject<MatrixType> &M);
 
+    /**
+     * Reset the object.
+     */
+    void reset();
+
     /**
      * Access matrix on a level.
      */
@@ -185,6 +190,16 @@ namespace mg
 
 
 
+  template <typename VectorType>
+  inline
+  void
+  Matrix<VectorType>::reset ()
+  {
+    matrices.resize(0,0);
+  }
+
+
+
   template <typename VectorType>
   template <typename MatrixType>
   inline