2 files changed, 10 insertions, 2 deletions
diff --git a/src/kernel/NeKit/Config.h b/src/kernel/NeKit/Config.h
index 900ea28c..7cf01a2c 100644
--- a/src/kernel/NeKit/Config.h
+++ b/src/kernel/NeKit/Config.h
@@ -203,4 +203,12 @@ struct TrueResult final {
 
   static constexpr bool kValue = true;
 };
+
+template <class Type>
+struct PropertyResult final {
+  using ResultType    = Type;
+  using ResultTypeRef = ResultType&;
+
+  static constexpr bool kValue = Type::kValue;
+};
 }  // namespace Kernel
diff --git a/src/kernel/NeKit/Vettable.h b/src/kernel/NeKit/Vettable.h
index c8c27fe3..294aaad5 100644
--- a/src/kernel/NeKit/Vettable.h
+++ b/src/kernel/NeKit/Vettable.h
@@ -40,12 +40,12 @@ struct Vettable<IVettable> final {
   static constexpr bool kValue = true;
 };
 
-using FallbackType = bool (*)(bool);
+using FallbackType = bool (*)(bool type_value);
 
 /// @brief Concept version of Vettable.
 template <typename Type, FallbackType OnFallback>
 concept IsVettable = requires() {
-  { Vettable<Type>::kValue ? TrueResult<Type>::kValue : OnFallback(FalseResult<Type>::kValue) };
+  { Vettable<Type>::kValue ? TrueResult<Type>::kValue : OnFallback(PropertyResult<Type>::kValue) };
 };
 }  // namespace Kernel