ture, so for example in this
call</p>
<pre class="literal-block">
graphs::depth_first_search(x, y);
</pre>
<!-- @ignore() -->
<p><tt class="docutils literal">x</tt> will always be interpreted as a graph and <tt class="docutils literal">y</tt> will always
be interpreted as a visitor.</p>
</div>
<div class="section" id="default-expression-evaluation">
<h4>2.1.5.5&nbsp;&nbsp;&nbsp;Default Expression Evaluation</h4>
<div class="compound">
<p class="compound-first">Note that in our example, the value of the grap