enum class field access

include/sp/protocol/MessageBase.h

@@ -119,6 +119,12 @@ class MessageImplFieldsBase : public TBase {
 		return std::get<FIndex>(GetFields()).GetValue();
 	}
 
+	// allow use of enums
+	template <typename E, E FIndex>
+	const auto& GetField() const {
+		return std::get<static_cast<std::size_t>(FIndex)>(this->GetFields()).GetValue();
+	}
+
   private:
 	AllFields m_Fields;
 };