</code>
              </p>
            </th>
<th>
              <p>
                Type of <code class="computeroutput"><span class="keyword">const</span> <span class="identifier">T1</span></code>
              </p>
            </th>
<th>
              <p>
                Type of <code class="computeroutput"><span class="identifier">add_reference</span><span class="special">&lt;</span><span class="keyword">const</span>
                <span class="identifier">T1</span><span class="special">&gt;::</span><sp