From c0823a56eed0b50d8cd60575358b3bcaf40950ab Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 2 Jun 2022 07:54:53 -0600
Subject: [PATCH] Pre-allocate the size of an array.

---
 source/base/mpi_compute_index_owner_internal.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/source/base/mpi_compute_index_owner_internal.cc b/source/base/mpi_compute_index_owner_internal.cc
index 8f1dd43b96..c96e46a9f0 100644
--- a/source/base/mpi_compute_index_owner_internal.cc
+++ b/source/base/mpi_compute_index_owner_internal.cc
@@ -354,8 +354,9 @@ namespace Utilities
                 /* targets = */
                 [&buffers]() {
                   std::vector<unsigned int> targets;
+                  targets.reserve(buffers.size());
                   for (const auto &rank_pair : buffers)
-                    targets.push_back(rank_pair.first);
+                    targets.emplace_back(rank_pair.first);
 
                   return targets;
                 }(),
-- 
2.39.5