Function is_instance

library/include/DataDefs.h:460–468

        static const virtual_identity *find(std::string_view name);

        bool is_instance(virtual_ptr instance_ptr) const {
            if (!instance_ptr) return false;
            if (vtable_ptr()) {
                void *vtable = get_vtable(instance_ptr);
                if (vtable == vtable_ptr()) return true;
                if (!hasChildren()) return false;
            }
            return is_subclass(get(instance_ptr));
        }

        bool is_direct_instance(virtual_ptr instance_ptr) const {
            if (!instance_ptr) return false;