From: Peter Munch <peterrmuench@gmail.com>
Date: Tue, 9 Mar 2021 07:39:42 +0000 (+0100)
Subject: MGTransferGlobalCoarsening: add assert
X-Git-Tag: v9.3.0-rc1~352^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f76eabd700a6a0f3934890bed094e11957ac5cbe;p=dealii.git

MGTransferGlobalCoarsening: add assert
---

diff --git a/include/deal.II/multigrid/mg_transfer_global_coarsening.h b/include/deal.II/multigrid/mg_transfer_global_coarsening.h
index ea86730e57..aaf96ed803 100644
--- a/include/deal.II/multigrid/mg_transfer_global_coarsening.h
+++ b/include/deal.II/multigrid/mg_transfer_global_coarsening.h
@@ -481,6 +481,13 @@ MGTransferGlobalCoarsening<dim, VectorType>::copy_to_mg(
 {
   (void)dof_handler;
 
+  Assert(
+    initialize_dof_vector,
+    ExcMessage(
+      "To be able to use this function, a function to initialize an internal "
+      "DoF vector has to be provided in the constructor of "
+      "MGTransferGlobalCoarsening."));
+
   for (unsigned int level = dst.min_level(); level <= dst.max_level(); ++level)
     initialize_dof_vector(level, dst[level]);
 
@@ -514,6 +521,13 @@ MGTransferGlobalCoarsening<dim, VectorType>::interpolate_to_mg(
 {
   (void)dof_handler;
 
+  Assert(
+    initialize_dof_vector,
+    ExcMessage(
+      "To be able to use this function, a function to initialize an internal "
+      "DoF vector has to be provided in the constructor of "
+      "MGTransferGlobalCoarsening."));
+
   const unsigned int min_level = transfer.min_level();
   const unsigned int max_level = transfer.max_level();