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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>
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<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> </dd></dl> </article> </div> </div> </div>