title: Is there equivalent of <? extends T>, <? super T> in C++?
body: <ol>
  <li><p>Is there equivalent of <code>&lt;? extends T&gt;</code>, <code>&lt;? super T&gt;</code> in C++?</p></li>
  <li><p>Also, does <code>&lt;? extends T&gt;</code>, <code>&lt;? super T&gt;</code> work even if <code>T</code> is an interface in Java?</p></li>
  </ol>