eroutput">link_mode&lt;&gt;</code>.</p>
<p><code class="computeroutput">tag&lt;&gt;</code> defines a tag to identify the node. The same tag value can be used in different classes, but if a class is derived from more than one <code class="computeroutput"><a class="link" href="list_base_hook.html" title="Class template list_base_hook">list_base_hook</a></code>, then each <code class="computeroutput"><a class="link" href="list_base_hook.html" title="Class template list_base_hook">list_base_hook</a></code> need