diff --git a/source/mijin/util/variant.hpp b/source/mijin/util/variant.hpp
index a3a98d5..b30de87 100644
--- a/source/mijin/util/variant.hpp
+++ b/source/mijin/util/variant.hpp
@@ -4,6 +4,7 @@
 #if !defined(MIJIN_UTIL_VARIANT_HPP_INCLUDED)
 #define MIJIN_UTIL_VARIANT_HPP_INCLUDED 1
 
+#include <utility>
 #include <variant>
 #include "./traits.hpp"
 
@@ -23,10 +24,21 @@ inline constexpr bool variant_contains_v<TSearch, std::variant<TVariantTypes...>
 //
 // public types
 //
+
 template<typename... TCallable>
 struct Visitor : TCallable ...
 {
     using TCallable::operator()...;
 };
+
+template<typename TRet>
+struct CastTo
+{
+    template<typename T>
+    TRet operator()(T&& arg) const
+    {
+        return static_cast<TRet>(std::forward<T>(arg));
+    }
+};
 }
 #endif // !defined(MIJIN_UTIL_VARIANT_HPP_INCLUDED)