span>

  <span class="comment">// Example using make_filter_iterator()</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">copy</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">make_filter_iterator</span><span class="special">&lt;</span><span class="identifier">is_positive_number</span><span class="special">&gt;(</span><span class="identifier">numbers</span><span class="special">,<