meta: no context-less meta_any from meta objects as it ought to be

TODO

@@ -42,4 +42,3 @@ TODO:
 * sparse_set shrink_to_fit argument for sparse array shrink policy (none, empty, deep, whatever)
 * any cdynamic to support const ownership construction
 * track meta context on meta elements
-* no context-less meta_any{} from meta objects if possible

src/entt/meta/meta.hpp

@@ -882,7 +882,7 @@ struct meta_data {
      * @return A wrapper containing the value of the underlying variable.
      */
     [[nodiscard]] meta_any get(meta_handle instance) const {
-        return (node.get != nullptr) ? node.get(*ctx, meta_handle{*ctx, std::move(instance)}) : meta_any{};
+        return (node.get != nullptr) ? node.get(*ctx, meta_handle{*ctx, std::move(instance)}) : meta_any{meta_ctx_arg, *ctx};
     }
 
     /**
@@ -1004,7 +1004,7 @@ struct meta_func {
      * @return A wrapper containing the returned value, if any.
      */
     meta_any invoke(meta_handle instance, meta_any *const args, const size_type sz) const {
-        return ((node.invoke != nullptr) && (sz == arity())) ? node.invoke(*ctx, meta_handle{*ctx, std::move(instance)}, args) : meta_any{};
+        return ((node.invoke != nullptr) && (sz == arity())) ? node.invoke(*ctx, meta_handle{*ctx, std::move(instance)}, args) : meta_any{meta_ctx_arg, *ctx};
     }
 
     /**
@@ -1378,7 +1378,7 @@ public:
             return node.default_constructor(*ctx);
         }
 
-        return meta_any{};
+        return meta_any{meta_ctx_arg, *ctx};
     }
 
     /**
@@ -1399,7 +1399,7 @@ public:
      * @return A wrapper that references the given instance.
      */
     [[nodiscard]] meta_any from_void(void *elem, bool transfer_ownership = false) const {
-        return ((elem != nullptr) && (node.from_void != nullptr)) ? node.from_void(*ctx, elem, transfer_ownership ? elem : nullptr) : meta_any{};
+        return ((elem != nullptr) && (node.from_void != nullptr)) ? node.from_void(*ctx, elem, transfer_ownership ? elem : nullptr) : meta_any{meta_ctx_arg, *ctx};
     }
 
     /**
@@ -1408,7 +1408,7 @@ public:
      * @return A wrapper that references the given instance.
      */
     [[nodiscard]] meta_any from_void(const void *elem) const {
-        return ((elem != nullptr) && (node.from_void != nullptr)) ? node.from_void(*ctx, nullptr, elem) : meta_any{};
+        return ((elem != nullptr) && (node.from_void != nullptr)) ? node.from_void(*ctx, nullptr, elem) : meta_any{meta_ctx_arg, *ctx};
     }
 
     /**
@@ -1435,7 +1435,7 @@ public:
             }
         }
 
-        return meta_any{};
+        return meta_any{meta_ctx_arg, *ctx};
     }
 
     /**
@@ -1475,7 +1475,7 @@ public:
      */
     [[nodiscard]] meta_any get(const id_type id, meta_handle instance) const {
         const auto candidate = data(id);
-        return candidate ? candidate.get(std::move(instance)) : meta_any{};
+        return candidate ? candidate.get(std::move(instance)) : meta_any{meta_ctx_arg, *ctx};
     }
 
     /*! @copydoc meta_data::traits */