tion
          takes in a pointer or reference to an object as the first argument. For
          instance, given:
        </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">xyz</span>
<span class="special">{</span>
    <span class="keyword">void</span> <span class="identifier">foo</span><span class="special">(</span><span class="keyword">int</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}