[PL] Reflection support for extrapolated quantities

ProcessLib/Reflection/ReflectionForExtrapolation.h

+/**
+ * \file
+ * \copyright
+ * Copyright (c) 2012-2022, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/project/license
+ *
+ */
+
+#pragma once
+
+#include "ProcessLib/Output/SecondaryVariable.h"
+#include "ReflectionIPData.h"
+
+namespace ProcessLib::Reflection
+{
+/// Adds secondary variables for all IP data obtained recursively from the given
+/// \c reflection_data to the given secondary variable collection.
+template <int Dim, typename LocAsmIF, typename ReflData>
+void addReflectedSecondaryVariables(
+    ReflData const& reflection_data,
+    SecondaryVariableCollection& secondary_variables,
+    NumLib::Extrapolator& extrapolator,
+    std::vector<std::unique_ptr<LocAsmIF>> const& local_assemblers)
+{
+    forEachReflectedFlattenedIPDataAccessor<Dim, LocAsmIF>(
+        reflection_data,
+        [&secondary_variables, &local_assemblers, &extrapolator](
+            std::string const& name,
+            unsigned const num_comp,
+            auto&& flattened_ip_data_accessor)
+        {
+            secondary_variables.addSecondaryVariable(
+                name,
+                makeExtrapolator2(num_comp, extrapolator, local_assemblers,
+                                  flattened_ip_data_accessor));
+        });
+}
+}  // namespace ProcessLib::Reflection