meta: [[nodiscard]]

src/entt/meta/context.hpp

@@ -21,8 +21,8 @@ struct meta_type_node;
 struct meta_context {
     dense_map<id_type, meta_type_node, identity> value{};
 
-    static inline meta_context &from(meta_ctx &ctx);
-    static inline const meta_context &from(const meta_ctx &ctx);
+    [[nodiscard]] static inline meta_context &from(meta_ctx &ctx);
+    [[nodiscard]] static inline const meta_context &from(const meta_ctx &ctx);
 };
 
 } // namespace internal
@@ -49,11 +49,11 @@ class meta_ctx: private internal::meta_context {
  * Internal details not to be documented.
  */
 
-inline internal::meta_context &internal::meta_context::from(meta_ctx &ctx) {
+[[nodiscard]] inline internal::meta_context &internal::meta_context::from(meta_ctx &ctx) {
     return ctx;
 }
 
-inline const internal::meta_context &internal::meta_context::from(const meta_ctx &ctx) {
+[[nodiscard]] inline const internal::meta_context &internal::meta_context::from(const meta_ctx &ctx) {
     return ctx;
 }
 

src/entt/meta/factory.hpp

@@ -29,7 +29,7 @@ namespace entt {
 
 namespace internal {
 
-inline decltype(auto) owner(meta_ctx &ctx, const type_info &info) {
+[[nodiscard]] inline decltype(auto) owner(meta_ctx &ctx, const type_info &info) {
     auto &&context = internal::meta_context::from(ctx);
     ENTT_ASSERT(context.value.contains(info.hash()), "Type not available");
     return context.value[info.hash()];

src/entt/meta/meta.hpp

@@ -613,7 +613,7 @@ private:
  * @return A properly initialized and not necessarily owning wrapper.
  */
 template<typename Type>
-meta_any forward_as_meta(const meta_ctx &ctx, Type &&value) {
+[[nodiscard]] meta_any forward_as_meta(const meta_ctx &ctx, Type &&value) {
     return meta_any{ctx, std::in_place_type<Type &&>, std::forward<Type>(value)};
 }
 
@@ -624,7 +624,7 @@ meta_any forward_as_meta(const meta_ctx &ctx, Type &&value) {
  * @return A properly initialized and not necessarily owning wrapper.
  */
 template<typename Type>
-meta_any forward_as_meta(Type &&value) {
+[[nodiscard]] meta_any forward_as_meta(Type &&value) {
     return forward_as_meta(locator<meta_ctx>::value_or(), std::forward<Type>(value));
 }
 
@@ -1348,12 +1348,12 @@ public:
      * @param element A valid pointer to an element of the underlying type.
      * @return A wrapper that references the given instance.
      */
-    meta_any from_void(void *element) const {
+    [[nodiscard]] meta_any from_void(void *element) const {
         return (element && node.from_void) ? node.from_void(*ctx, element, nullptr) : meta_any{meta_ctx_arg, *ctx};
     }
 
     /*! @copydoc from_void */
-    meta_any from_void(const void *element) const {
+    [[nodiscard]] meta_any from_void(const void *element) const {
         return (element && node.from_void) ? node.from_void(*ctx, nullptr, element) : meta_any{meta_ctx_arg, *ctx};
     }
 

src/entt/meta/utility.hpp

@@ -162,7 +162,7 @@ using meta_function_helper_t = typename meta_function_helper<Type, Candidate>::t
  * @return A meta any containing the returned value, if any.
  */
 template<typename Policy = as_is_t, typename Type>
-std::enable_if_t<is_meta_policy_v<Policy>, meta_any> meta_dispatch(const meta_ctx &ctx, [[maybe_unused]] Type &&value) {
+[[nodiscard]] std::enable_if_t<is_meta_policy_v<Policy>, meta_any> meta_dispatch(const meta_ctx &ctx, [[maybe_unused]] Type &&value) {
     if constexpr(std::is_same_v<Policy, as_void_t>) {
         return meta_any{ctx, std::in_place_type<void>};
     } else if constexpr(std::is_same_v<Policy, as_ref_t>) {
@@ -183,7 +183,7 @@ std::enable_if_t<is_meta_policy_v<Policy>, meta_any> meta_dispatch(const meta_ct
  * @return A meta any containing the returned value, if any.
  */
 template<typename Policy = as_is_t, typename Type>
-std::enable_if_t<is_meta_policy_v<Policy>, meta_any> meta_dispatch(Type &&value) {
+[[nodiscard]] std::enable_if_t<is_meta_policy_v<Policy>, meta_any> meta_dispatch(Type &&value) {
     return meta_dispatch<Policy, Type>(locator<meta_ctx>::value_or(), std::forward<Type>(value));
 }