From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 3 Oct 2017 21:39:39 +0000 (-0600)
Subject: Minor optimization of some memory allocation.
X-Git-Tag: v9.0.0-rc1~993^2~3
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0307bf1063b1106a2a2b42a35d78bd8a3a800dbe;p=dealii.git

Minor optimization of some memory allocation.
---

diff --git a/include/deal.II/numerics/vector_tools.templates.h b/include/deal.II/numerics/vector_tools.templates.h
index 9bccee6e31..db5f59919c 100644
--- a/include/deal.II/numerics/vector_tools.templates.h
+++ b/include/deal.II/numerics/vector_tools.templates.h
@@ -138,10 +138,10 @@ namespace VectorTools
               auto shifted_view = boost::make_iterator_range(
                                     std::begin(function_values[i]) + offset,
                                     std::begin(function_values[i]) + offset + dim);
-              std::vector<number> old_value;
+              std::vector<number> old_value(dim);
               std::copy(std::begin(shifted_view),
                         std::end(shifted_view),
-                        std::back_inserter(old_value));
+                        std::begin(old_value));
 
               // value[m] <- sum jacobian_transpose[m][n] * old_value[n]:
               TensorAccessors::contract<1, 2, 1, dim>(
@@ -167,10 +167,10 @@ namespace VectorTools
               auto shifted_view = boost::make_iterator_range(
                                     std::begin(function_values[i]) + offset,
                                     std::begin(function_values[i]) + offset + dim);
-              std::vector<number> old_value;
+              std::vector<number> old_value(dim);
               std::copy(std::begin(shifted_view),
                         std::end(shifted_view),
-                        std::back_inserter(old_value));
+                        std::begin(old_value));
 
               // value[m] <- sum inverse_jacobians[m][n] * old_value[n]:
               TensorAccessors::contract<1, 2, 1, dim>(