Pass 'const double' objects by-value, rather than by-reference.

diff --git a/include/deal.II/fe/fe_point_evaluation.h b/include/deal.II/fe/fe_point_evaluation.h
index ee1f544bae0725332aa476d3a6ed7f036059b73f..b902873f6d0a53f2750f8dc619ca0d84bda3f106 100644 (file)
--- a/include/deal.II/fe/fe_point_evaluation.h
+++ b/include/deal.II/fe/fe_point_evaluation.h
@@ -48,7 +48,7 @@ namespace internal
       using gradient_type = Tensor<1, n_components, Tensor<1, dim>>;
 
       static void
-      read_value(const double &     vector_entry,
+      read_value(const double       vector_entry,
                  const unsigned int component,
                  value_type &       result)
       {
@@ -128,7 +128,7 @@ namespace internal
       using gradient_type = Tensor<1, dim>;
 
       static void
-      read_value(const double &vector_entry,
+      read_value(const double vector_entry,
                  const unsigned int,
                  value_type &result)
       {
@@ -198,7 +198,7 @@ namespace internal
       using gradient_type = Tensor<2, dim>;
 
       static void
-      read_value(const double &     vector_entry,
+      read_value(const double       vector_entry,
                  const unsigned int component,
                  value_type &       result)
       {
@@ -283,7 +283,7 @@ namespace internal
       using gradient_type = Tensor<1, 1>;
 
       static void
-      read_value(const double &vector_entry,
+      read_value(const double vector_entry,
                  const unsigned int,
                  value_type &result)
       {