ass="listitem">
            gsl_vector for compatibility with the many numerical function in the
            GSL
          </li>
<li class="listitem">
            <a href="http://www.boost.org/doc/libs/release/libs/range/index.html" target="_top">Boost.Range</a>
          </li>
<li class="listitem">
            <a href="http://www.boost.org/doc/libs/release/libs/fusion/index.html" target="_top">Boost.Fusion</a>
            (the state type can be a fusion vector)
          </li>
<li class="listitem">
       