meta_factory: expose underlying type

src/entt/meta/factory.hpp

@@ -151,6 +151,9 @@ class meta_factory: private internal::basic_meta_factory {
     using base_type = internal::basic_meta_factory;
 
 public:
+    /*! @brief Underlying type of the factory. */
+    using type = Type;
+
     /*! @brief Default constructor. */
     meta_factory() noexcept
         : meta_factory{locator<meta_ctx>::value_or()} {}