d at 
    <code style="white-space: normal">u</code>.
  </dd>
  <dt><h4><code>
    sa.register_type&lt;T&gt;()
    <br>
    sa.register_type(u)
  </code></h4></dt>
  <dd>
    Appends information about class T to the archive.  This information is used to
    construct the correct class when a derived pointer is loaded by a corresponding
    Loading Archive type.  
    Invocation of this member function is referred to as "class registration".  
    This is explained in detail in
    <a href="special.html#deri