>&gt;,</span> <span class="identifier">R</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">random_access_iterator_tag</span><span class="special">,</span> <span class="identifier">R</span><span class="special">&gt;</span> <span class="comment">//new traversal tag boost::random_access_traversal_tag</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
    <span class="identifier">Ri