><span class="identifier">std</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><span class="identifier">W</span><span class="special">,</span> <span class="identifier">B</span><span class="special">::</span><span class="identifier">writer</span><span class="special">&gt;::</span><span class="identifier">value</span> <span class="special">==</span>
            <span class="keyword">true</span></code>.
          </li>
<li class="listitem">
          