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<a href="../../ex/cpp_3A_3A/constant.html" class="prev"><span>➤</span> constant()</a>
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<h1>Method defined()</h1>
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<dt class='head--type'><span class='homogen--type'>Method</span>
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<span class='homogen--name'><b>defined</b></span>
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</dt>
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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>
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<dt class='head--doc'>Description</dt>
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<dd class='body--doc'><p>Check whether an identifier is a cpp macro or not.</p>
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<dt class='head--doc'>Returns</dt>
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<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
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is defined.</p>
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<dt class='head--doc'>Note</dt>
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<dd class='body--doc'><p><tt>#if defined(MY_DEF)</tt> is equivalent to
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<tt>#ifdef MY_DEF</tt>.</p>
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<dt class='head--doc'>See also</dt>
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<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>
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