/p>
<b>Initial value:</b><div class="fragment"><div class="line">= [](<span class="keyword">auto</span>&amp;&amp; x, <span class="keyword">auto</span>&amp;&amp; ...y) -&gt; decltype(<span class="keyword">auto</span>) {</div>
<div class="line">        <span class="keywordflow">return</span> tag-dispatched;</div>
<div class="line">    }</div>
</div><!-- fragment -->
<p>Return whether all the arguments are true-valued. </p>
<p><code>and_</code> can be called with one argument or more. When called with two argu