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/www.cppreference.com/wiki/preprocessor/undef

https://github.com/tsgates/cclookup
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  23. <script type="text/javascript" ><!--//--><![CDATA[//><!--
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  24. var NS='preprocessor';var JSINFO = {"id":"preprocessor:undef","namespace":"preprocessor"};
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  25. //--><!]]></script>
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  31. <h2 class="sectionedit1"><a name="undef" id="undef">#undef</a></h2>
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  35. Syntax:
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  37. </p>
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  38. <pre class="cpp code cpp">    <span class="co2">#define MAX_LEN 255</span>
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  39.     <span class="co2">#undef MAX_LEN</span></pre>
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  40. <p>
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  42. 

  43. The #undef command undefines a previously defined macro variable, such as a
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  44. variable defined by a <a href="define" class="wikilink1" title="preprocessor:define">#define</a>.
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  45. </p>
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  47. <p>
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  48. Related topics: <a href="define" class="wikilink1" title="preprocessor:define">#define</a>
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