     element of a tuple
              </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">Pi</span></code></span></dt>
<dd><p>
                The type of the <code class="computeroutput"><span class="identifier">i</span></code>th
                parameter
              </p></dd>
</dl>
</div>
<pre class="programlisting"><span class="identifier">tuple</span><span class="special">();</span>
</pre>
<p>
          <span class="bold"><strong>Requirements</strong></span>: Each <c