
   <span class="special">}</span>
<span class="special">};</span>
</pre>
<p>
        Notice that if the continuant is subtracted from the <span class="emphasis"><em>b</em></span>
        terms, as is the case here, then all the <span class="emphasis"><em>a</em></span> terms returned
        by the generator will be negative. The tangent function can now be evaluated
        using:
      </p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyw