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<a name="Incomplete-Enums"></a>
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Next: <a rel="next" accesskey="n" href="Function-Names.html#Function-Names">Function Names</a>,
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Previous: <a rel="previous" accesskey="p" href="Alternate-Keywords.html#Alternate-Keywords">Alternate Keywords</a>,
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Up: <a rel="up" accesskey="u" href="C-Extensions.html#C-Extensions">C Extensions</a>
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<h3 class="section">6.45 Incomplete <code>enum</code> Types</h3>
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<p>You can define an <code>enum</code> tag without specifying its possible values.
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This results in an incomplete type, much like what you get if you write
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<code>struct foo</code> without describing the elements. A later declaration
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that does specify the possible values completes the type.
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<p>You can't allocate variables or storage using the type while it is
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incomplete. However, you can work with pointers to that type.
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<p>This extension may not be very useful, but it makes the handling of
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<code>enum</code> more consistent with the way <code>struct</code> and <code>union</code>
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are handled.
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<p>This extension is not supported by GNU C++.
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