   </li>
<li class="listitem">
          Added a number of new traits <a class="link" href="reference/is_assignable.html" title="is_assignable">is_assignable</a>,
          <a class="link" href="reference/is_default_constructible.html" title="is_default_constructible">is_default_constructible</a>,
          <a class="link" href="reference/is_constructible.html" title="is_constructible">is_constructible</a>
          and <a class="link" href="reference/is_destructible.html" title="is_destructible">is_destruc