n> <span class="identifier">char_type</span> <a class="link" href="c_regex_traits.html#idp115404272-bb"><span class="identifier">toupper</span></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="c_regex_traits.html#idp115406000-bb"><span class="identifier">in_range</span></a><span class="special">(</span><span class="identifier">cha