an class="string">" "</span><span class="special">));</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>

  <span class="comment">// Another example using make_filter_iterator()</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">co