Improve aliasing by explicitly copying a value.

diff --git a/source/fe/fe_values_views_internal.cc b/source/fe/fe_values_views_internal.cc
index 4a038e2122ec431349d5f24596e2aa27f5e29a59..ab6abb8a6e202082089b4843fd297f6e98782a12 100644 (file)
--- a/source/fe/fe_values_views_internal.cc
+++ b/source/fe/fe_values_views_internal.cc
@@ -81,7 +81,7 @@ namespace FEValuesViews
         if (shape_function_data[shape_function]
               .is_nonzero_shape_function_component)
           {
-            const Number &value = dof_values[shape_function];
+            const Number value = dof_values[shape_function];
             // For auto-differentiable numbers, the fact that a DoF value is
             // zero does not imply that its derivatives are zero as well. So we
             // can't filter by value for these number types.
@@ -122,7 +122,7 @@ namespace FEValuesViews
         if (shape_function_data[shape_function]
               .is_nonzero_shape_function_component)
           {
-            const Number &value = dof_values[shape_function];
+            const Number value = dof_values[shape_function];
             // For auto-differentiable numbers, the fact that a DoF value is
             // zero does not imply that its derivatives are zero as well. So we
             // can't filter by value for these number types.
@@ -164,7 +164,7 @@ namespace FEValuesViews
         if (shape_function_data[shape_function]
               .is_nonzero_shape_function_component)
           {
-            const Number &value = dof_values[shape_function];
+            const Number value = dof_values[shape_function];
             // For auto-differentiable numbers, the fact that a DoF value is
             // zero does not imply that its derivatives are zero as well. So we
             // can't filter by value for these number types.
@@ -212,7 +212,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -274,7 +274,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -340,7 +340,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -408,7 +408,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -485,7 +485,7 @@ namespace FEValuesViews
                     // shape function is zero for the selected components
                     continue;
 
-                  const Number &value = dof_values[shape_function];
+                  const Number value = dof_values[shape_function];
                   // For auto-differentiable numbers, the fact that a DoF value
                   // is zero does not imply that its derivatives are zero as
                   // well. So we can't filter by value for these number types.
@@ -568,7 +568,7 @@ namespace FEValuesViews
                     // shape function is zero for the selected components
                     continue;
 
-                  const Number &value = dof_values[shape_function];
+                  const Number value = dof_values[shape_function];
                   // For auto-differentiable numbers, the fact that a DoF value
                   // is zero does not imply that its derivatives are zero as
                   // well. So we can't filter by value for these number types.
@@ -731,7 +731,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -801,7 +801,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -870,7 +870,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -977,7 +977,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -1047,7 +1047,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.
@@ -1117,7 +1117,7 @@ namespace FEValuesViews
             // shape function is zero for the selected components
             continue;
 
-          const Number &value = dof_values[shape_function];
+          const Number value = dof_values[shape_function];
           // For auto-differentiable numbers, the fact that a DoF value is zero
           // does not imply that its derivatives are zero as well. So we
           // can't filter by value for these number types.