All mutable at() overloads return a reference wrapper object, so no need for decltype(auto) return types. All const at() overloads for rows return either a reference, or a view wrapper on the row, so we use decltype(auto) consistently for those, as we want to return a const ref (and not a value) if we get one from the range. The at() overloads for getting a value return either the const data type, or a DataReference wrapper, so we can either be explicit or use auto. Remove the qdoc-only type aliases for (const)row_reference, as they are no longer used in documentation. Pick-to: 6.11 Change-Id: I319be33a9db2ca61a95eebcde34d83b35b5013b9 Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>