span class="keyword">void</span> <a name="idp72473888-bb"></a><span class="identifier">replace_node</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">node_ptr</span> <span class="special">&amp;</span> node_to_be_replaced<span class="special">,</span> 
                         <span class="keyword">const</span> <span class="identifier">node_ptr</span> <span class="special">&amp;</span> header<span class="special">,</span> <span class="keyword">const</span> <span 