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104 lines
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104 lines
4.3 KiB
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<a name="compatibility_005falias"></a>
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Next: <a href="Exceptions.html#Exceptions" accesskey="n" rel="next">Exceptions</a>, Previous: <a href="Constant-string-objects.html#Constant-string-objects" accesskey="p" rel="prev">Constant string objects</a>, Up: <a href="Objective_002dC.html#Objective_002dC" accesskey="u" rel="up">Objective-C</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="compatibility_005falias-1"></a>
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<h3 class="section">8.6 <code>compatibility_alias</code></h3>
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<p>The keyword <code>@compatibility_alias</code> allows you to define a class name
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as equivalent to another class name. For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">@compatibility_alias WOApplication GSWApplication;
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</pre></div>
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<p>tells the compiler that each time it encounters <code>WOApplication</code> as
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a class name, it should replace it with <code>GSWApplication</code> (that is,
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<code>WOApplication</code> is just an alias for <code>GSWApplication</code>).
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</p>
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<p>There are some constraints on how this can be used—
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</p>
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<ul>
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<li> <code>WOApplication</code> (the alias) must not be an existing class;
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</li><li> <code>GSWApplication</code> (the real class) must be an existing class.
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</li></ul>
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