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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright &copy; 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.   <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below).  A copy of the license isincluded in the section entitled "GNU Free Documentation License".   <p>(a) The FSF's Front-Cover Text is:   <p>A GNU Manual   <p>(b) The FSF's Back-Cover Text is:   <p>You have freedom to copy and modify this GNU Manual, like GNU     software.  Copies published by the Free Software Foundation raise     funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!--  pre.display { font-family:inherit }  pre.format  { font-family:inherit }  pre.smalldisplay { font-family:inherit; font-size:smaller }  pre.smallformat  { font-family:inherit; font-size:smaller }  pre.smallexample { font-size:smaller }  pre.smalllisp    { font-size:smaller }--></style></head><body><div class="node"><p>Node:&nbsp;<a name="compatibility_alias">compatibility_alias</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Constant-string-objects.html#Constant%20string%20objects">Constant string objects</a>,Up:&nbsp;<a rel="up" accesskey="u" href="Objective-C.html#Objective-C">Objective-C</a><hr><br></div><h3 class="section">compatibility_alias</h3><p>This is a feature of the Objective-C compiler rather than of theruntime, anyway since it is documented nowhere and its existence wasforgotten, we are documenting it here.   <p>The keyword <code>@compatibility_alias</code> allows you to define a class nameas equivalent to another class name.  For example:<pre class="smallexample">     @compatibility_alias WOApplication GSWApplication;     </pre>   <p>tells the compiler that each time it encounters <code>WOApplication</code> asa class name, it should replace it with <code>GSWApplication</code> (that is,<code>WOApplication</code> is just an alias for <code>GSWApplication</code>).   <p>There are some constraints on how this can be used--     <ul>     <li><code>WOApplication</code> (the alias) must not be an existing class;     <li><code>GSWApplication</code> (the real class) must be an existing class.   </ul>   </body></html>
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