From e211a8cbf6e4044fa150e150acfedb4960368ab2 Mon Sep 17 00:00:00 2001
From: Arne Morten Kvarving <arne.morten.kvarving@sintef.no>
Date: Wed, 1 Feb 2023 14:38:34 +0100
Subject: [PATCH] Serializer: handle Dune::FieldVector as arrays

---
 opm/common/utility/Serializer.hpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/opm/common/utility/Serializer.hpp b/opm/common/utility/Serializer.hpp
index de1d429eb..97c3d55b0 100644
--- a/opm/common/utility/Serializer.hpp
+++ b/opm/common/utility/Serializer.hpp
@@ -35,6 +35,10 @@
 #include <variant>
 #include <vector>
 
+#if HAVE_DUNE_COMMON
+namespace Dune { template<typename,int> class FieldVector; }
+#endif
+
 namespace Opm {
 namespace detail {
 
@@ -484,6 +488,13 @@ protected:
         constexpr static bool value = true;
     };
 
+#if HAVE_DUNE_COMMON
+    template<class T, int N>
+    struct is_array<Dune::FieldVector<T,N>> {
+        constexpr static bool value = true;
+    };
+#endif
+
     //! Detect existence of \c serializeOp member function
     //!
     //! Base case (no \c serializeOp member function)