ng></span>: If <code class="computeroutput"><a class="link" href="link_mode.html" title="Struct template link_mode">link_mode</a></code> is <code class="computeroutput">auto_unlink</code> or <code class="computeroutput">safe_link</code> initializes the node to an unlinked state. The argument is ignored.</p>
<p><span class="bold"><strong>Throws</strong></span>: Nothing.</p>
<p><span class="bold"><strong>Rationale</strong></span>: Providing a copy-constructor makes classes using the hook STL-compliant without