 class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;(...)</span></code> when <code class="computeroutput"><span class="identifier">U</span></code>
              is a pointer or reference type.
            </li>
</ol></div>
<p>
          This should be acceptably safe because users have to explicitly specify
          a pointer/reference for <code class="computeroutput"><span class="identifier">U</span></code>
          in <code class="computeroutput"><span class="identifie