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<h1>Directive #undef</h1>
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<dl class='group--doc'>
<dt class='head--type'><span class='homogen--type'>Directive</span>
<span class='homogen--name'><b>#undef</b></span>
</dt>
<dd><p><code class='directive'>#undef</code><br>
<code class='directive'>#undefine</code></p></dd>
<dt class='head--doc'>Description</dt>
<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
the undefined identifier will not be replaced by anything.</p>
</dd>
<dt class='head--doc'>Note</dt>
<dd class='body--doc'><p>Note that when undefining a macro, you just give the identifer,
not the arguments.</p>
</dd>
<dt class='head--doc'>Example</dt>
<dd class='example'><pre><p>// Strip debug
#define werror(X ...) 0
#include "/home/someone/experimental/stuff.h"
#undef werror</p>
</pre></dd>
<dt class='head--doc'>See also</dt>
<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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