/code> is <em>false-valued</em>, or sometimes just <em>false</em>, if </p><div class="fragment"><div class="line"><a class="code" href="group__group-_logical.html#gafd655d2222367131e7a63616e93dd080">if_</a>(x, <span class="keyword">true</span>, <span class="keyword">false</span>) == <span class="keyword">false</span></div>
</div><!-- fragment --><p>This provides a standard way of converting any <code>Logical</code> to a straight <code>bool</code>. The notion of truth value suggests another definition, which