From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 17 Aug 2023 11:54:03 +0000 (-0600)
Subject: Clear maps, rather than reset pointers.
X-Git-Tag: relicensing~583^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F15877%2Fhead;p=dealii.git

Clear maps, rather than reset pointers.
---

diff --git a/source/grid/tria.cc b/source/grid/tria.cc
index 4b0c65fa41..83218e3631 100644
--- a/source/grid/tria.cc
+++ b/source/grid/tria.cc
@@ -16086,11 +16086,19 @@ void Triangulation<dim, spacedim>::clear_despite_subscriptions()
   // In 1d, also reset vertex-to-(boundary|manifold) maps to empty maps
   if (dim == 1)
     {
-      vertex_to_boundary_id_map_1d =
-        std::make_unique<std::map<unsigned int, types::boundary_id>>();
-      vertex_to_manifold_id_map_1d =
-        std::make_unique<std::map<unsigned int, types::manifold_id>>();
+      Assert(vertex_to_boundary_id_map_1d != nullptr, ExcInternalError());
+      vertex_to_boundary_id_map_1d->clear();
+
+      Assert(vertex_to_manifold_id_map_1d != nullptr, ExcInternalError());
+      vertex_to_manifold_id_map_1d->clear();
     }
+  else
+    {
+      // For dim>1, these maps should simply not exist.
+      Assert(vertex_to_boundary_id_map_1d == nullptr, ExcInternalError());
+      Assert(vertex_to_manifold_id_map_1d == nullptr, ExcInternalError());
+    }
+
 
   number_cache = internal::TriangulationImplementation::NumberCache<dim>();
 }