</code> with the same tag, but whose truth-value is negated. Specifically, <code>not_(x)</code> returns a false-valued <code>Logical</code> if <code>x</code> is a true-valued <code>Logical</code>, and a true-valued one otherwise.</p>
<h2><a class="anchor" id="autotoc_md291"></a>
Example</h2>
<div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div>
<div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span>