From 33fe4a9974851ce841b1f3ce9300646498ec08c3 Mon Sep 17 00:00:00 2001
From: Jean-Paul Pelteret <jppelteret@gmail.com>
Date: Mon, 11 Feb 2019 18:44:32 +0100
Subject: [PATCH] Mark a function as constant.

---
 include/deal.II/differentiation/ad/ad_helpers.h | 2 +-
 source/differentiation/ad/ad_helpers.cc         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/deal.II/differentiation/ad/ad_helpers.h b/include/deal.II/differentiation/ad/ad_helpers.h
index ba21b90be5..61bb85daeb 100644
--- a/include/deal.II/differentiation/ad/ad_helpers.h
+++ b/include/deal.II/differentiation/ad/ad_helpers.h
@@ -950,7 +950,7 @@ namespace Differentiation
        * @note For taped AD numbers, this operation is only valid in recording mode.
        */
       const std::vector<ad_type> &
-      get_sensitive_dof_values();
+      get_sensitive_dof_values() const;
 
       //@}
 
diff --git a/source/differentiation/ad/ad_helpers.cc b/source/differentiation/ad/ad_helpers.cc
index e259ab6019..98f90b0aed 100644
--- a/source/differentiation/ad/ad_helpers.cc
+++ b/source/differentiation/ad/ad_helpers.cc
@@ -738,7 +738,7 @@ namespace Differentiation
     const std::vector<
       typename ADHelperCellLevelBase<ADNumberTypeCode, ScalarType>::ad_type> &
     ADHelperCellLevelBase<ADNumberTypeCode,
-                          ScalarType>::get_sensitive_dof_values()
+                          ScalarType>::get_sensitive_dof_values() const
     {
       if (ADNumberTraits<ad_type>::is_taped == true)
         {
-- 
2.39.5