an></a><span class="special">(</span><span class="identifier">char_type</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="cpp_regex_traits.html#id-1_3_47_5_18_2_1_1_5_3-bb"><span class="identifier">in_range</span></a><span class="special">(</span><span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">char_type</span><span class="special">,</span> <span clas