<dt><span class="term">Policies</span></dt>
<dd><p>
              The combined policies to use to create an instance of a multi_pass
              iterator. This combined policy type is described below
            </p></dd>
</dl>
</div>
<p>
        It is possible to implement all of the required functionality of the combined
        policy in a single class. But it has shown to be more convenient to split
        this into four different groups of functions, i.e. four separate, but well
        coordinated 