From: Timo Heister <timo.heister@gmail.com>
Date: Mon, 2 Mar 2020 01:57:45 +0000 (-0500)
Subject: address comments
X-Git-Tag: v9.2.0-rc1~451^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca8168eed67f14b0b446d5413e2a2f8387e0f0fa;p=dealii.git

address comments
---

diff --git a/source/distributed/grid_refinement.cc b/source/distributed/grid_refinement.cc
index 4eb262fab7..e5aeeb0b21 100644
--- a/source/distributed/grid_refinement.cc
+++ b/source/distributed/grid_refinement.cc
@@ -256,16 +256,16 @@ namespace internal
                      (interesting_range[0] + interesting_range[1]) / 2);
 
                 // Count how many of our own elements would be above this
-                // threshold:
-                types::global_cell_index my_count =
+                // threshold. Use a 64bit result type if we are compiling with
+                // 64bit indices to avoid an overflow when computing the sum
+                // below.
+                const types::global_cell_index my_count =
                   std::count_if(criteria.begin(),
                                 criteria.end(),
                                 [test_threshold](const double c) {
                                   return c > test_threshold;
                                 });
-
-                // Potentially accumulate in a 64bit int to avoid overflow:
-                types::global_cell_index total_count =
+                const types::global_cell_index total_count =
                   Utilities::MPI::sum(my_count, mpi_communicator);
 
                 // now adjust the range. if we have too many cells, we take the