nough to use it.
    </p>
<p>
      Since base classes are unnamed, a class cannot have multiple (direct) base
      classes of the same type. The supplied template class has an extra template
      parameter, an integer, that exists solely to provide type differentiation.
      This parameter has a default value so a single use of a particular member type
      does not need to concern itself with the integer.
    </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="c