an> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">rectangle</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span>
<span class="special">{</span>
    <span class="keyword">if</span> <span class="special">(</span><span class="identifier">p</span><span class="special">)</span>
    <span class="special">{</span>
    