herwise.
        </p>
<p>
          <span class="bold"><strong>Semantics</strong></span>: Copy initializes each element
          with the corresponding parameter.
        </p>
<pre class="programlisting"><span class="identifier">tuple</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">tuple</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">);</span>
</pre>
<p>
          <span class="bold"><strong>Requirements</strong