Fix nvhpc/msvc builds

Author: franzpoeschel

include/openPMD/backend/BaseRecord.hpp

@@ -382,6 +382,21 @@ namespace detail
 
     template <typename BaseRecord>
     void verifyNonscalar(BaseRecord *self);
+
+    template <typename T>
+    struct IsBaseRecord
+    {
+        constexpr static bool value = false;
+    };
+
+    template <typename T>
+    struct IsBaseRecord<BaseRecord<T>>
+    {
+        constexpr static bool value = true;
+    };
+
+    template <typename T>
+    constexpr bool IsBaseRecord_v = IsBaseRecord<T>::value;
 } // namespace detail
 
 template <typename T_elem>

src/backend/ScientificDefaults.cpp

@@ -784,14 +784,22 @@ void ScientificDefaults<Child>::defaults_impl(OpenpmdStandard standard)
             // .withReader(float_types, require_type<double>())
             (wor);
     }
-    else if constexpr (auxiliary::IsTemplateBaseOf_v<BaseRecord, Child>)
+    else if constexpr (detail::IsBaseRecord_v<Child>)
     {
         defaultAttribute("unitDimension")
             .withGenericSetter(unit_representations::AsArray{})
             .withReader(
                 float_types,
                 require_type<unit_representations::AsArray>())(wor);
     }
+    else if constexpr (std::is_same_v<Child, ParticleSpecies>)
+    {
+        // no-op
+    }
+    else
+    {
+        static_assert(auxiliary::dependent_false_v<Child>, "Unknown class");
+    }
 }
 
 template <typename Child>