diff --git a/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp.hpp b/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp.hpp
index aae047a68..08c49adc7 100644
--- a/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp.hpp
+++ b/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp.hpp
@@ -14,5 +14,6 @@
 #include "power_grid_model_cpp/model.hpp"
 #include "power_grid_model_cpp/options.hpp"
 #include "power_grid_model_cpp/serialization.hpp"
+#include "power_grid_model_cpp/utils.hpp"
 
 #endif // POWER_GRID_MODEL_CPP_HPP
diff --git a/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp/basics.hpp b/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp/basics.hpp
index 65cfab603..378216c32 100644
--- a/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp/basics.hpp
+++ b/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp/basics.hpp
@@ -27,6 +27,7 @@ namespace power_grid_model_cpp {
 
 using Idx = PGM_Idx;
 using ID = PGM_ID;
+using IntS = int8_t;
 
 using PowerGridModel = PGM_PowerGridModel;
 using MetaDataset = PGM_MetaDataset;
diff --git a/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp/utils.hpp b/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp/utils.hpp
new file mode 100644
index 000000000..78e981474
--- /dev/null
+++ b/power_grid_model_c/power_grid_model_cpp/include/power_grid_model_cpp/utils.hpp
@@ -0,0 +1,56 @@
+// SPDX-FileCopyrightText: Contributors to the Power Grid Model project <powergridmodel@lfenergy.org>
+//
+// SPDX-License-Identifier: MPL-2.0
+
+#pragma once
+
+#ifndef POWER_GRID_MODEL_CPP_UTILS_HPP
+#define POWER_GRID_MODEL_CPP_UTILS_HPP
+
+#include "basics.hpp"
+#include "handle.hpp"
+
+#include <array>
+#include <complex>
+#include <limits>
+
+namespace power_grid_model_cpp {
+inline bool is_nan(IntS const x) { return x == std::numeric_limits<IntS>::min(); }
+inline bool is_nan(ID const x) { return x == std::numeric_limits<ID>::min(); }
+inline bool is_nan(double const x) { return std::isnan(x); }
+inline bool is_nan(std::complex<double> const& x) { return is_nan(x.real()) || is_nan(x.imag()); }
+inline bool is_nan(std::array<double, 3> const& array) {
+    return is_nan(array[0]) || is_nan(array[1]) || is_nan(array[2]);
+}
+inline bool is_nan(std::array<std::complex<double>, 3> const& array) {
+    return is_nan(array[0]) || is_nan(array[1]) || is_nan(array[2]);
+}
+
+class UnsupportedPGM_CType : public PowerGridError {
+  public:
+    UnsupportedPGM_CType()
+        : PowerGridError{[&]() {
+              using namespace std::string_literals;
+              return "Unsupported PGM_Ctype"s;
+          }()} {}
+};
+
+template <class Functor, class... Args>
+decltype(auto) pgm_type_func_selector(enum PGM_CType type, Functor&& f, Args&&... args) {
+    switch (type) {
+    case PGM_int32:
+        return std::forward<Functor>(f).template operator()<ID>(std::forward<Args>(args)...);
+    case PGM_int8:
+        return std::forward<Functor>(f).template operator()<IntS>(std::forward<Args>(args)...);
+    case PGM_double:
+        return std::forward<Functor>(f).template operator()<double>(std::forward<Args>(args)...);
+    case PGM_double3:
+        return std::forward<Functor>(f).template operator()<std::array<double, 3>>(std::forward<Args>(args)...);
+    default:
+        throw UnsupportedPGM_CType();
+    }
+}
+
+} // namespace power_grid_model_cpp
+
+#endif // POWER_GRID_MODEL_CPP_UTILS_HPP
diff --git a/tests/cpp_validation_tests/test_validation.cpp b/tests/cpp_validation_tests/test_validation.cpp
index c3b6d7a6e..71035fec9 100644
--- a/tests/cpp_validation_tests/test_validation.cpp
+++ b/tests/cpp_validation_tests/test_validation.cpp
@@ -35,15 +35,6 @@ class UnsupportedValidationCase : public PowerGridError {
           }()} {}
 };
 
-class UnsupportedPGM_CType : public PowerGridError {
-  public:
-    UnsupportedPGM_CType()
-        : PowerGridError{[&]() {
-              using namespace std::string_literals;
-              return "Unsupported PGM_Ctype"s;
-          }()} {}
-};
-
 class OptionalNotInitialized : public PowerGridError {
   public:
     OptionalNotInitialized(std::string const& object)
@@ -53,32 +44,6 @@ class OptionalNotInitialized : public PowerGridError {
           }()} {}
 };
 
-inline bool is_nan(std::floating_point auto x) { return std::isnan(x); }
-template <std::floating_point T> inline bool is_nan(std::complex<T> const& x) {
-    return is_nan(x.real()) || is_nan(x.imag());
-}
-inline bool is_nan(int32_t x) { return x == std::numeric_limits<int32_t>::min(); }
-inline bool is_nan(int8_t x) { return x == std::numeric_limits<int8_t>::min(); }
-template <typename T, std::size_t N> inline bool is_nan(std::array<T, N> const& array) {
-    return std::ranges::any_of(array, [](T const& element) { return is_nan(element); });
-}
-
-template <class Functor, class... Args>
-decltype(auto) pgm_type_func_selector(enum PGM_CType type, Functor&& f, Args&&... args) {
-    switch (type) {
-    case PGM_int32:
-        return std::forward<Functor>(f).template operator()<int32_t>(std::forward<Args>(args)...);
-    case PGM_int8:
-        return std::forward<Functor>(f).template operator()<int8_t>(std::forward<Args>(args)...);
-    case PGM_double:
-        return std::forward<Functor>(f).template operator()<double>(std::forward<Args>(args)...);
-    case PGM_double3:
-        return std::forward<Functor>(f).template operator()<std::array<double, 3>>(std::forward<Args>(args)...);
-    default:
-        throw UnsupportedPGM_CType();
-    }
-}
-
 using nlohmann::json;
 
 auto read_file(std::filesystem::path const& path) {
@@ -184,7 +149,7 @@ template <typename T> std::string get_as_string(T const& attribute_value) {
     sstr << std::setprecision(16);
     if constexpr (std::is_same_v<std::decay_t<T>, std::array<double, 3>>) {
         sstr << "(" << attribute_value[0] << ", " << attribute_value[1] << ", " << attribute_value[2] << ")";
-    } else if constexpr (std::is_same_v<std::decay_t<T>, int8_t>) {
+    } else if constexpr (std::is_same_v<std::decay_t<T>, IntS>) {
         sstr << std::to_string(attribute_value);
     } else {
         sstr << attribute_value;