File: forbidden-subclassing.rst

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.. title:: clang-tidy - objc-forbidden-subclassing

objc-forbidden-subclassing
==========================

Finds Objective-C classes which are subclasses of classes which are not designed
to be subclassed.

By default, includes a list of Objective-C classes which are publicly documented
as not supporting subclassing.

.. note::

   Instead of using this check, for code under your control, you should add
   ``__attribute__((objc_subclassing_restricted))`` before your ``@interface``
   declarations to ensure the compiler prevents others from subclassing your
   Objective-C classes.
   See https://clang.llvm.org/docs/AttributeReference.html#objc-subclassing-restricted

Options
-------

.. option:: ForbiddenSuperClassNames

   Semicolon-separated list of names of Objective-C classes which
   do not support subclassing.

   Defaults to `ABNewPersonViewController;ABPeoplePickerNavigationController;ABPersonViewController;ABUnknownPersonViewController;NSHashTable;NSMapTable;NSPointerArray;NSPointerFunctions;NSTimer;UIActionSheet;UIAlertView;UIImagePickerController;UITextInputMode;UIWebView`.