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 any of the arguments is true-valued. </p>
<p><code>or_</code> can be called with one argument or more. When called with two arguments, <code>or_</code> uses tag-dispatching to find the right implementation. Otherwise, </p><div class="fragment"><div class="line"><a class="code" 