er">boost</span><span class="special">::</span><span class="identifier">forward_traversal_tag</span><span class="special">&gt;</span><span class="special">,</span>
  <span class="identifier">same_type</span><span class="special">&lt;</span><span class="identifier">iterator</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">forward_traversal_tag</span><span class="special">&gt;</span><span class="special">::</span><span class="i