meta: deprecate ctors that should not exist

src/entt/meta/meta.hpp

@@ -651,13 +651,14 @@ template<typename Type>
 /*! @brief Opaque pointers to instances of any type. */
 struct meta_handle {
     /*! Default constructor. */
+    [[deprecated("not necessary, use direct contructors instead")]]
     meta_handle() = default;
 
     /**
      * @brief Context aware constructor.
      * @param area The context from which to search for meta types.
      */
-    [[deprecated("not necessary, use the default constructor instead")]]
+    [[deprecated("not necessary, use direct contructors instead")]]
     meta_handle(meta_ctx_arg_t, const meta_ctx &area)
         : any{meta_ctx_arg, area} {}
 

src/entt/meta/utility.hpp

@@ -204,7 +204,7 @@ template<typename Policy, typename Candidate, typename... Args>
 }
 
 template<typename Type, typename Policy, typename Candidate, std::size_t... Index>
-[[nodiscard]] meta_any meta_invoke(meta_handle &instance, Candidate &&candidate, [[maybe_unused]] meta_any *const args, std::index_sequence<Index...>) {
+[[nodiscard]] meta_any meta_invoke(meta_handle instance, Candidate &&candidate, [[maybe_unused]] meta_any *const args, std::index_sequence<Index...>) {
     using descriptor = meta_function_helper_t<Type, std::remove_reference_t<Candidate>>;
 
     // NOLINTBEGIN(cppcoreguidelines-pro-bounds-pointer-arithmetic) - waiting for C++20 (and std::span)
@@ -354,7 +354,7 @@ template<typename Type, auto Data, typename Policy = as_is_t>
  */
 template<typename Type, typename Policy = as_is_t, typename Candidate>
 [[nodiscard]] std::enable_if_t<is_meta_policy_v<Policy>, meta_any> meta_invoke(meta_handle instance, Candidate &&candidate, meta_any *const args) {
-    return internal::meta_invoke<Type, Policy>(instance, std::forward<Candidate>(candidate), args, std::make_index_sequence<meta_function_helper_t<Type, std::remove_reference_t<Candidate>>::args_type::size>{});
+    return internal::meta_invoke<Type, Policy>(std::move(instance), std::forward<Candidate>(candidate), args, std::make_index_sequence<meta_function_helper_t<Type, std::remove_reference_t<Candidate>>::args_type::size>{});
 }
 
 /**
@@ -368,7 +368,7 @@ template<typename Type, typename Policy = as_is_t, typename Candidate>
  */
 template<typename Type, auto Candidate, typename Policy = as_is_t>
 [[nodiscard]] std::enable_if_t<is_meta_policy_v<Policy>, meta_any> meta_invoke(meta_handle instance, meta_any *const args) {
-    return internal::meta_invoke<Type, Policy>(instance, Candidate, args, std::make_index_sequence<meta_function_helper_t<Type, std::remove_reference_t<decltype(Candidate)>>::args_type::size>{});
+    return internal::meta_invoke<Type, Policy>(std::move(instance), Candidate, args, std::make_index_sequence<meta_function_helper_t<Type, std::remove_reference_t<decltype(Candidate)>>::args_type::size>{});
 }
 
 /**
@@ -419,12 +419,11 @@ template<typename Type, typename... Args>
 template<typename Type, typename Policy = as_is_t, typename Candidate>
 [[nodiscard]] meta_any meta_construct(const meta_ctx &ctx, Candidate &&candidate, meta_any *const args) {
     if constexpr(meta_function_helper_t<Type, Candidate>::is_static || std::is_class_v<std::remove_cv_t<std::remove_reference_t<Candidate>>>) {
-        meta_handle placeholder{meta_ctx_arg, ctx};
+        meta_any placeholder{meta_ctx_arg, ctx};
         return internal::meta_invoke<Type, Policy>(placeholder, std::forward<Candidate>(candidate), args, std::make_index_sequence<meta_function_helper_t<Type, std::remove_reference_t<Candidate>>::args_type::size>{});
     } else {
-        meta_handle target{*args};
         // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic) - waiting for C++20 (and std::span)
-        return internal::meta_invoke<Type, Policy>(target, std::forward<Candidate>(candidate), args + 1u, std::make_index_sequence<meta_function_helper_t<Type, std::remove_reference_t<Candidate>>::args_type::size>{});
+        return internal::meta_invoke<Type, Policy>(*args, std::forward<Candidate>(candidate), args + 1u, std::make_index_sequence<meta_function_helper_t<Type, std::remove_reference_t<Candidate>>::args_type::size>{});
     }
 }