meta: explicit checks

src/entt/meta/meta.hpp

@@ -555,14 +555,14 @@ public:
      */
     [[nodiscard]] meta_sequence_container as_sequence_container() noexcept {
         meta_sequence_container proxy = (storage.policy() == any_policy::cref) ? std::as_const(*this).as_sequence_container() : meta_sequence_container{};
-        if(!proxy && vtable) { vtable(internal::meta_traits::is_sequence_container, *ctx, storage.data(), &proxy); }
+        if(!proxy && vtable != nullptr) { vtable(internal::meta_traits::is_sequence_container, *ctx, storage.data(), &proxy); }
         return proxy;
     }
 
     /*! @copydoc as_sequence_container */
     [[nodiscard]] meta_sequence_container as_sequence_container() const noexcept {
         meta_sequence_container proxy{};
-        if(vtable) { vtable(internal::meta_traits::is_sequence_container | internal::meta_traits::is_const, *ctx, storage.data(), &proxy); }
+        if(vtable != nullptr) { vtable(internal::meta_traits::is_sequence_container | internal::meta_traits::is_const, *ctx, storage.data(), &proxy); }
         return proxy;
     }
 
@@ -572,14 +572,14 @@ public:
      */
     [[nodiscard]] meta_associative_container as_associative_container() noexcept {
         meta_associative_container proxy = (storage.policy() == any_policy::cref) ? std::as_const(*this).as_associative_container() : meta_associative_container{};
-        if(!proxy && vtable) { vtable(internal::meta_traits::is_associative_container, *ctx, storage.data(), &proxy); }
+        if(!proxy && vtable != nullptr) { vtable(internal::meta_traits::is_associative_container, *ctx, storage.data(), &proxy); }
         return proxy;
     }
 
     /*! @copydoc as_associative_container */
     [[nodiscard]] meta_associative_container as_associative_container() const noexcept {
         meta_associative_container proxy{};
-        if(vtable) { vtable(internal::meta_traits::is_associative_container | internal::meta_traits::is_const, *ctx, storage.data(), &proxy); }
+        if(vtable != nullptr) { vtable(internal::meta_traits::is_associative_container | internal::meta_traits::is_const, *ctx, storage.data(), &proxy); }
         return proxy;
     }
 
@@ -590,7 +590,7 @@ public:
      */
     [[nodiscard]] meta_any operator*() const noexcept {
         meta_any ret{meta_ctx_arg, *ctx};
-        if(vtable) { vtable(internal::meta_traits::is_pointer_like, *ctx, storage.data(), &ret); }
+        if(vtable != nullptr) { vtable(internal::meta_traits::is_pointer_like, *ctx, storage.data(), &ret); }
         return ret;
     }