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<dd><p><code><code class='datatype'>bool</code> <b><span class='method'>defined</span>(</b><code class='datatype'>mixed</code> <code class='argument'>identifier</code><b>)</b></code></p></dd> <dt class='head--doc'>Description</dt> <dd class='body--doc'><p>Check whether an identifier is a cpp macro or not.</p> </dd> <dt class='head--doc'>Returns</dt> <dd class='body--doc'><p><a class='ms reference' href='../cpp_3A_3A/defined.html'>defined</a> returns true if the symbol given as argument is defined.</p> </dd> <dt class='head--doc'>Note</dt>
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<dd class='body--doc'><p><tt>#if defined(MY_DEF)</tt> is
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<dd class='body--doc'><p><tt>#if defined(MY_DEF)</tt> is
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<tt>#ifdef MY_DEF</tt>.</p> </dd> <dt class='head--doc'>See also</dt> <dd class='body--doc'><p><a class='ms reference' href='../cpp_3A_3A/defined.html'>#if</a>, <a class='ms reference' href='../cpp_3A_3A/defined.html'>#ifdef</a>, <a class='ms reference' href='../cpp_3A_3A/constant.html'>constant()</a></p> </dd></dl> </article> </div> </div> </div>