add derivative.hh

dune/localfunctions/common/derivative.hh

@@ -35,6 +35,14 @@ namespace Dune
       using type = FieldMatrix<ST, m, n>;
     };
 
+    template <typename S, typename T, int n>
+    struct DerivativeTraits<FieldVector<S, 1>(FieldVector<T, n>),
+                            std::void_t<std::common_type_t<S, T>>>
+    {
+      using ST = std::common_type_t<S, T>;
+      using type = FieldVector<ST, n>;
+    };
+
     // call `f.derivative(Domain)`
     template <typename Domain, typename F,
               decltype((std::declval<F>().derivative(std::declval<Domain>()), true)) = true>