From 583ff6c1d5ba00c846c0afe834f841b24d070d64 Mon Sep 17 00:00:00 2001
From: Jean-Paul Pelteret <jppelteret@gmail.com>
Date: Thu, 12 Apr 2018 15:33:49 +0200
Subject: [PATCH] Instantiate Tensor class for auto-differentiable numbers

---
 .../changes/minor/20180412Jean-PaulPelteret-2 |  4 +++
 source/base/tensor.cc                         |  6 +++++
 source/base/tensor.inst.in                    | 26 +++++++++++++++++++
 3 files changed, 36 insertions(+)
 create mode 100644 doc/news/changes/minor/20180412Jean-PaulPelteret-2

diff --git a/doc/news/changes/minor/20180412Jean-PaulPelteret-2 b/doc/news/changes/minor/20180412Jean-PaulPelteret-2
new file mode 100644
index 0000000000..d809b37c8a
--- /dev/null
+++ b/doc/news/changes/minor/20180412Jean-PaulPelteret-2
@@ -0,0 +1,4 @@
+Fixed: The Tensor class was previously not instantiated for
+auto-differentiable numbers.
+<br>
+(Jean-Paul Pelteret, 2018/04/12)
diff --git a/source/base/tensor.cc b/source/base/tensor.cc
index acf9af0cdd..96675577a6 100644
--- a/source/base/tensor.cc
+++ b/source/base/tensor.cc
@@ -13,6 +13,12 @@
 //
 // ---------------------------------------------------------------------
 
+#include <deal.II/base/config.h>
+
+// Required for instantiation of template functions
+#include <deal.II/differentiation/ad/adolc_product_types.h>
+#include <deal.II/differentiation/ad/sacado_product_types.h>
+
 #include <deal.II/base/tensor.h>
 
 DEAL_II_NAMESPACE_OPEN
diff --git a/source/base/tensor.inst.in b/source/base/tensor.inst.in
index 18840ec4d7..afc817e162 100644
--- a/source/base/tensor.inst.in
+++ b/source/base/tensor.inst.in
@@ -40,3 +40,29 @@ for (deal_II_dimension : DIMENSIONS; number : COMPLEX_SCALARS)
     template
     class Tensor<0,deal_II_dimension,number>;
 }
+
+
+for (rank : RANKS; deal_II_dimension : DIMENSIONS; number : DIFFERENTIABLE_ADOLC_REAL_SCALARS)
+{
+    template
+    class Tensor<rank,deal_II_dimension,number>;
+}
+
+
+for (deal_II_dimension : DIMENSIONS; number : DIFFERENTIABLE_ADOLC_REAL_SCALARS)
+{
+    template
+    class Tensor<0,deal_II_dimension,number>;
+}
+
+for (rank : RANKS; deal_II_dimension : DIMENSIONS; number : DIFFERENTIABLE_TRILINOS_SACADO_REAL_SCALARS)
+{
+    template
+    class Tensor<rank,deal_II_dimension,number>;
+}
+
+for (deal_II_dimension : DIMENSIONS; number : DIFFERENTIABLE_TRILINOS_SACADO_REAL_SCALARS)
+{
+    template
+    class Tensor<0,deal_II_dimension,number>;
+}
-- 
2.39.5