a well-known default state.
          </li>
<li class="listitem">
            Hook's destructor checks if the hook is in the well-known default state.
            If not, an assertion is raised.
          </li>
<li class="listitem">
            Every time an object is inserted in the intrusive container, the container
            checks if the hook is in the well-known default state. If not, an assertion
            is raised.
          </li>
<li class="listitem">
            Every time an object is being e