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<a href="../../ex/cpp_3A_3A/_23string.html" class="prev"><span>➤</span> #string</a>
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<a href="../../ex/cpp_3A_3A/_23undefine.html" class="next">#undefine <span>➤</span></a>
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<h1>Directive #undef</h1>
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<dl class='group--doc'>
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<dt class='head--type'><span class='homogen--type'>Directive</span>
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<span class='homogen--name'><b>#undef</b></span>
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</dt>
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<dd><p><code class='directive'>#undef</code><br>
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<code class='directive'>#undefine</code></p></dd>
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<dt class='head--doc'>Description</dt>
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<dd class='body--doc'><p>This removes the effect of a <a class='ms reference' href='../cpp_3A_3A.html'>#define</a>, all subsequent occurances of
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the undefined identifier will not be replaced by anything.</p>
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</dd>
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<dt class='head--doc'>Note</dt>
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<dd class='body--doc'><p>Note that when undefining a macro, you just give the identifer,
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not the arguments.</p>
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</dd>
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<dt class='head--doc'>Example</dt>
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<dd class='example'><pre><p>// Strip debug
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#define werror(X ...) 0
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#include "/home/someone/experimental/stuff.h"
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#undef werror</p>
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</pre></dd>
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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.html'>#define</a>, <a class='ms reference' href='../cpp_3A_3A/defined.html'>defined()</a></p>
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