</span><span class="identifier">position_tagged</span>
    <span class="special">{</span>
        <span class="identifier">person</span><span class="special">(</span>
            <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">first_name</span> <span class="special">=</span> <span class="string">""</span>
          <span class="special">,</span> <span class="