diff --git a/power_grid_model_c/power_grid_model/include/power_grid_model/common/common.hpp b/power_grid_model_c/power_grid_model/include/power_grid_model/common/common.hpp
index 43c6d78ce..9b465962c 100644
--- a/power_grid_model_c/power_grid_model/include/power_grid_model/common/common.hpp
+++ b/power_grid_model_c/power_grid_model/include/power_grid_model/common/common.hpp
@@ -91,4 +91,10 @@ using IntSVector = std::vector<IntS>;
 template <class T, class... Ts>
 concept is_in_list_c = (std::same_as<std::remove_const_t<T>, Ts> || ...);
 
+// functor to include all
+struct IncludeAll {
+    constexpr bool operator()(Idx /*ignored*/) const { return true; }
+};
+constexpr IncludeAll include_all{};
+
 } // namespace power_grid_model
diff --git a/power_grid_model_c/power_grid_model/include/power_grid_model/main_model_impl.hpp b/power_grid_model_c/power_grid_model/include/power_grid_model/main_model_impl.hpp
index a512fc834..9113e1844 100644
--- a/power_grid_model_c/power_grid_model/include/power_grid_model/main_model_impl.hpp
+++ b/power_grid_model_c/power_grid_model/include/power_grid_model/main_model_impl.hpp
@@ -1014,8 +1014,6 @@ class MainModelImpl<ExtraRetrievableTypes<ExtraRetrievableType...>, ComponentLis
         return math_param_increment;
     }
 
-    static constexpr auto include_all = [](Idx) { return true; };
-
     /** This is a heavily templated member function because it operates on many different variables of many
      *different types, but the essence is ever the same: filling one member (vector) of the calculation calc_input
      *struct (soa) with the right calculation symmetric or asymmetric calculation parameters, in the same order as
@@ -1068,7 +1066,7 @@ class MainModelImpl<ExtraRetrievableTypes<ExtraRetrievableType...>, ComponentLis
      */
     template <calculation_input_type CalcStructOut, typename CalcParamOut,
               std::vector<CalcParamOut>(CalcStructOut::*comp_vect), class ComponentIn,
-              std::invocable<Idx> PredicateIn = decltype(include_all)>
+              std::invocable<Idx> PredicateIn = IncludeAll>
         requires std::convertible_to<std::invoke_result_t<PredicateIn, Idx>, bool>
     static void prepare_input(MainModelState const& state, std::vector<Idx2D> const& components,
                               std::vector<CalcStructOut>& calc_input, PredicateIn include = include_all) {
@@ -1087,7 +1085,7 @@ class MainModelImpl<ExtraRetrievableTypes<ExtraRetrievableType...>, ComponentLis
 
     template <calculation_input_type CalcStructOut, typename CalcParamOut,
               std::vector<CalcParamOut>(CalcStructOut::*comp_vect), class ComponentIn,
-              std::invocable<Idx> PredicateIn = decltype(include_all)>
+              std::invocable<Idx> PredicateIn = IncludeAll>
         requires std::convertible_to<std::invoke_result_t<PredicateIn, Idx>, bool>
     static void prepare_input(MainModelState const& state, std::vector<Idx2D> const& components,
                               std::vector<CalcStructOut>& calc_input,
diff --git a/power_grid_model_c/power_grid_model/include/power_grid_model/topology.hpp b/power_grid_model_c/power_grid_model/include/power_grid_model/topology.hpp
index 5968ebfcb..96f49d225 100644
--- a/power_grid_model_c/power_grid_model/include/power_grid_model/topology.hpp
+++ b/power_grid_model_c/power_grid_model/include/power_grid_model/topology.hpp
@@ -429,8 +429,6 @@ class Topology {
         }
     }
 
-    static constexpr auto include_all = [](Idx) { return true; };
-
     // proxy class to find the coupled object in math model in the coupling process to a single type object
     //    given a particular component index
     struct SingleTypeObjectFinder {
@@ -481,7 +479,7 @@ class Topology {
     // The coupling element should be pre-allocated in coupling
     // Only connect the component if include(component_i) returns true
     template <Idx (MathModelTopology::*n_obj_fn)() const, typename GetMathTopoComponent,
-              typename ObjectFinder = SingleTypeObjectFinder, typename Predicate = decltype(include_all)>
+              typename ObjectFinder = SingleTypeObjectFinder, typename Predicate = IncludeAll>
         requires std::invocable<std::remove_cvref_t<GetMathTopoComponent>, MathModelTopology&> &&
                  grouped_idx_vector_type<
                      std::remove_reference_t<std::invoke_result_t<GetMathTopoComponent, MathModelTopology&>>>