Pre-allocate the size of an array.

diff --git a/source/base/mpi_compute_index_owner_internal.cc b/source/base/mpi_compute_index_owner_internal.cc
index 8f1dd43b969f6ce4d1ca508250f9c4542610708e..c96e46a9f05e62353ec02715ffb7a664d3fe6898 100644 (file)
--- 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;
                 }(),