n class="identifier">attribute_name</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">name</span><span class="special">)</span>
    <span class="special">{</span>
        <span class="keyword">return</span> <span class="identifier">expr</span><span class="special">::</span><span class="identifier">has_attr</span><span class="special">&lt;</span> <span class="identifier">point</span> <span class="special">&gt;(</span><span class="identifier">name</span><span