GNU Info

(gcc-300.info)compatibility_alias

---

Prev: Constant string objects Up: Objective C

---

Enter node , (file) or (file)node

compatibility_alias
===================

   This is a feature of the Objective-C compiler rather than of the
runtime, anyway since it is documented nowhere and its existence was
forgotten, we are documenting it here.

   The keyword `@compatibility_alias' allows you to define a class name
as equivalent to another class name.  For example:

     @compatibility_alias WOApplication GSWApplication;

   tells the compiler that each time it encounters `WOApplication' as a
class name, it should replace it with `GSWApplication' (that is,
`WOApplication' is just an alias for `GSWApplication').

   There are some constraints on how this can be used--

   * `WOApplication' (the alias) must not be an existing class;

   * `GSWApplication' (the real class) must be an existing class.