From 9ab2ac6c46299f39deb5e7ef777f926c25b0038f Mon Sep 17 00:00:00 2001
From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Wed, 6 Jun 2018 02:57:47 +0200
Subject: [PATCH] Fix instantiations of SymmetricTensor

---
 include/deal.II/base/symmetric_tensor.h | 2 +-
 source/base/symmetric_tensor.cc         | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/deal.II/base/symmetric_tensor.h b/include/deal.II/base/symmetric_tensor.h
index 6879b34e66..9ac9040c7f 100644
--- a/include/deal.II/base/symmetric_tensor.h
+++ b/include/deal.II/base/symmetric_tensor.h
@@ -578,7 +578,7 @@ public:
    * describe a symmetric tensor. In $d$ space dimensions, this number equals
    * $\frac 12 (d^2+d)$ for symmetric tensors of rank 2.
    */
-  static const unsigned int n_independent_components =
+  static constexpr unsigned int n_independent_components =
     internal::SymmetricTensorAccessors::StorageType<rank_, dim, Number>::
       n_independent_components;
 
diff --git a/source/base/symmetric_tensor.cc b/source/base/symmetric_tensor.cc
index b526983396..bf74f26e32 100644
--- a/source/base/symmetric_tensor.cc
+++ b/source/base/symmetric_tensor.cc
@@ -30,7 +30,8 @@ template <int rank, int dim, typename Number>
 const unsigned int SymmetricTensor<rank, dim, Number>::dimension;
 
 template <int rank, int dim, typename Number>
-const unsigned int SymmetricTensor<rank, dim, Number>::n_independent_components;
+constexpr unsigned int
+  SymmetricTensor<rank, dim, Number>::n_independent_components;
 
 
 // explicit instantiations
-- 
2.39.5