lass="special">==</span> <span class="number">2.</span><span class="special">);</span>  <span class="comment">// as.x_min() returns 2.</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">as</span><span class="special">.</span><span class="identifier">x_max</span><span class="special">()</span> <span class="special">==</span> <span class="number">5.</span><span class="special">);</span>   <span class="comment">// as.x_max()  returns 5.</span>
</pre>
<h5>
<a nam