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<h3 class="section">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="example"> @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>
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