From 4986265a79d395df79ea15cee2141b87d2b4ef21 Mon Sep 17 00:00:00 2001
From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Sat, 13 Jan 2018 19:39:08 +0100
Subject: [PATCH] Make some variables const (references)

---
 include/deal.II/lac/full_matrix.templates.h | 4 ++--
 include/deal.II/lac/scalapack.h             | 2 +-
 source/grid/grid_tools.cc                   | 2 +-
 source/lac/scalapack.cc                     | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/deal.II/lac/full_matrix.templates.h b/include/deal.II/lac/full_matrix.templates.h
index e7dd78f5f8..25588acc4c 100644
--- a/include/deal.II/lac/full_matrix.templates.h
+++ b/include/deal.II/lac/full_matrix.templates.h
@@ -1315,7 +1315,7 @@ FullMatrix<number>::invert (const FullMatrix<number2> &M)
     {
       // avoid overwriting source
       // by destination matrix:
-      FullMatrix<number2> M2 = M;
+      const FullMatrix<number2> M2 = M;
       invert(M2);
     }
   else
@@ -1486,7 +1486,7 @@ FullMatrix<number>::cholesky (const FullMatrix<number2> &A)
     {
       // avoid overwriting source
       // by destination matrix:
-      FullMatrix<number2> A2 = A;
+      const FullMatrix<number2> A2 = A;
       cholesky(A2);
     }
   else
diff --git a/include/deal.II/lac/scalapack.h b/include/deal.II/lac/scalapack.h
index 2a1002e944..631eadf748 100644
--- a/include/deal.II/lac/scalapack.h
+++ b/include/deal.II/lac/scalapack.h
@@ -117,7 +117,7 @@ public:
    */
   ScaLAPACKMatrix(const size_type n_rows,
                   const size_type n_columns,
-                  const std::shared_ptr<const Utilities::MPI::ProcessGrid> process_grid,
+                  const std::shared_ptr<const Utilities::MPI::ProcessGrid> &process_grid,
                   const size_type row_block_size = 32,
                   const size_type column_block_size = 32,
                   const LAPACKSupport::Property property = LAPACKSupport::Property::general);
diff --git a/source/grid/grid_tools.cc b/source/grid/grid_tools.cc
index ecf5684ada..c8cb2bd8a7 100644
--- a/source/grid/grid_tools.cc
+++ b/source/grid/grid_tools.cc
@@ -2279,7 +2279,7 @@ next_cell:
         }
 
     // Creating a Bounding Box for all cells on the chosen refinement_level
-    for (typename MeshType::cell_iterator cell: mesh.cell_iterators_on_level(refinement_level))
+    for (const typename MeshType::cell_iterator &cell: mesh.cell_iterators_on_level(refinement_level))
       {
         bool has_predicate = false;
         BoundingBox < spacedim > bbox;
diff --git a/source/lac/scalapack.cc b/source/lac/scalapack.cc
index 7308231001..208f912d2b 100644
--- a/source/lac/scalapack.cc
+++ b/source/lac/scalapack.cc
@@ -27,7 +27,7 @@ DEAL_II_NAMESPACE_OPEN
 template <typename NumberType>
 ScaLAPACKMatrix<NumberType>::ScaLAPACKMatrix(const size_type n_rows_,
                                              const size_type n_columns_,
-                                             const std::shared_ptr<const Utilities::MPI::ProcessGrid> process_grid,
+                                             const std::shared_ptr<const Utilities::MPI::ProcessGrid> &process_grid,
                                              const size_type row_block_size_,
                                              const size_type column_block_size_,
                                              const LAPACKSupport::Property property)
-- 
2.39.5