n><span class="identifier">controller_factory</span></code>
        which constructs the controller from the tolerances and the stepper. In our
        dummy implementation this class is
      </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">numeric</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identif