ass="identifier">FwdIter</span><span class="special">,</span> <span class="identifier">FwdIter</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> FwdIter<span class="special">&gt;</span> 
    <span class="identifier">char_class_type</span> <a class="link" href="cpp_regex_traits.html#id-1_3_47_5_18_2_1_1_3_11-bb"><span class="identifier">lookup_class