an class="identifier">traits</span><span class="special">::</span><span class="identifier">is_char</span></code></a>
                  </p>
                </td>
<td>
                  <p>
                    For string types whose underlying character type is not <code class="computeroutput"><span class="keyword">char</span></code> or <code class="computeroutput"><span class="keyword">wchar_t</span></code>,
                    <code class="computeroutput"><span class="identifier">is_char</span></code> must