ss="keyword">const</span> <span class="special">{</span>
    <span class="keyword">return</span> <span class="identifier">x</span><span class="special">.</span><span class="identifier">a</span> <span class="special">&lt;</span> <span class="identifier">y</span><span class="special">.</span><span class="identifier">a</span><span class="special">;</span>
  <span class="special">}</span>
<span class="special">};</span>
</pre>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifi