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<a href="../../ex/cpp_3A_3A/_23if.html" class="prev"><span>➤</span> #if</a>
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<h1>Directive #ifdef</h1>
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| 286efd | 2012-03-24 | Henrik Grubbström (Grubba) | |
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<dl class='group--doc'>
<dt class='head--type'><span class='homogen--type'>Directive</span>
<span class='homogen--name'><b>#ifdef</b></span>
</dt>
<dd><p><code class='directive'>#ifdef</code></p></dd>
<dt class='head--doc'>Description</dt>
<dd class='body--doc'><p>Check whether an identifier is a macro.</p>
<p> The directive</p>
<p> <tt>#ifdef <i><identifier></i></tt></p>
<p> is equvivalent to</p>
<p> <tt>#if <a class='ms reference' href='../cpp_3A_3A/defined.html'>defined</a>(<i><identifier></i>)</tt></p>
</dd>
<dt class='head--doc'>See also</dt>
<dd class='body--doc'><p><a class='ms reference' href='../cpp_3A_3A.html'>#if</a>, <a class='ms reference' href='../cpp_3A_3A.html'>#ifndef</a>, <a class='ms reference' href='../cpp_3A_3A/defined.html'>defined</a></p>
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