| <html lang="en"> |
| <head> |
| <title>compatibility_alias - 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 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Objective_002dC.html#Objective_002dC" title="Objective-C"> |
| <link rel="prev" href="Constant-string-objects.html#Constant-string-objects" title="Constant string objects"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
| 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
| 2008 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.2 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Funding Free Software'', the Front-Cover |
| Texts being (a) (see below), and with the Back-Cover Texts being (b) |
| (see below). A copy of the license is included in the section entitled |
| ``GNU Free Documentation License''. |
| |
| (a) The FSF's Front-Cover Text is: |
| |
| A GNU Manual |
| |
| (b) The FSF's Back-Cover Text is: |
| |
| 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 } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="compatibility_alias"></a> |
| <a name="compatibility_005falias"></a> |
| <p> |
| Previous: <a rel="previous" accesskey="p" href="Constant-string-objects.html#Constant-string-objects">Constant string objects</a>, |
| Up: <a rel="up" accesskey="u" href="Objective_002dC.html#Objective_002dC">Objective-C</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">8.5 compatibility_alias</h3> |
| |
| <p>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. |
| |
| <p>The keyword <code>@compatibility_alias</code> allows you to define a class name |
| as 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> as |
| a 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> |
| |
| <!-- Copyright (C) 2002, 2004 Free Software Foundation, Inc. --> |
| <!-- This is part of the GCC manual. --> |
| <!-- For copying conditions, see the file gcc.texi. --> |
| </body></html> |
| |
