From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Thu, 29 Nov 2001 15:11:50 +0000 (+0000)
Subject: Slightly improve memory allocation.
X-Git-Tag: v8.0.0~18524
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9c264823164e8b49eacbb5a8f1f7e0cb6f522ba9;p=dealii.git

Slightly improve memory allocation.


git-svn-id: https://svn.dealii.org/trunk@5311 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/deal.II/source/dofs/dof_handler.cc b/deal.II/deal.II/source/dofs/dof_handler.cc
index fe4818a029..fb1bb3fc4b 100644
--- a/deal.II/deal.II/source/dofs/dof_handler.cc
+++ b/deal.II/deal.II/source/dofs/dof_handler.cc
@@ -1825,15 +1825,15 @@ template <>
 void DoFHandler<1>::reserve_space () {
   Assert (selected_fe != 0, ExcNoFESelected());
   Assert (tria->n_levels() > 0, ExcInvalidTriangulation());
+
                                    // delete all levels and set them up
                                    // newly, since vectors are
                                    // troublesome if you want to change
                                    // their size
   clear_space ();
   
-  vertex_dofs = std::vector<unsigned int>(tria->vertices.size()*
-					  selected_fe->dofs_per_vertex,
-					  invalid_dof_index);
+  vertex_dofs.resize(tria->vertices.size()*selected_fe->dofs_per_vertex,
+		     invalid_dof_index);
     
   for (unsigned int i=0; i<tria->n_levels(); ++i) 
     {
@@ -1862,9 +1862,9 @@ void DoFHandler<2>::reserve_space () {
                                    // their size
   clear_space ();
   
-  vertex_dofs = std::vector<unsigned int>(tria->vertices.size()*
-					  selected_fe->dofs_per_vertex,
-					  invalid_dof_index);
+  vertex_dofs.resize(tria->vertices.size()*selected_fe->dofs_per_vertex,
+		     invalid_dof_index);
+
   for (unsigned int i=0; i<tria->n_levels(); ++i) 
     {
       levels.push_back (new DoFLevel<2>);
@@ -1894,9 +1894,9 @@ void DoFHandler<3>::reserve_space () {
                                    // their size
   clear_space ();
   
-  vertex_dofs = std::vector<unsigned int>(tria->vertices.size()*
-					  selected_fe->dofs_per_vertex,
-					  invalid_dof_index);
+  vertex_dofs.resize(tria->vertices.size()*selected_fe->dofs_per_vertex,
+		     invalid_dof_index);
+
   for (unsigned int i=0; i<tria->n_levels(); ++i) 
     {
       levels.push_back (new DoFLevel<3>);
@@ -1921,6 +1921,9 @@ void DoFHandler<dim>::clear_space () {
   for (unsigned int i=0; i<levels.size(); ++i)
     delete levels[i];
   levels.resize (0);
+
+  std::vector<unsigned int> tmp;
+  std::swap (vertex_dofs, tmp);
 };