class="p">),</span> <span class="n">std</span><span class="o">::</span><span class="n">end</span><span class="p">(</span><span class="n">people</span><span class="p">),</span>
        <span class="n">proj</span><span class="p">(</span><span class="o">&amp;</span><span class="n">Person</span><span class="o">::</span><span class="n">year_of_birth</span><span class="p">,</span> <span class="n">_</span> <span class="o">&lt;</span> <span class="n">_</span><span class="p">));</span>
</pre></div>
</div>
</div>
<di