+#ifdef INSPIRCD_INTRUSIVE_LIST_HAS_TAIL
+ T* back() const
+ {
+ return listtail;
+ }
+
+ void push_back(T* x)
+ {
+ if (listsize++)
+ {
+ x->intrusive_list_node<T, Tag>::ptr_prev = listtail;
+ listtail->intrusive_list_node<T, Tag>::ptr_next = x;
+ }
+ else
+ listhead = x;
+ listtail = x;
+ }
+
+ void pop_back()
+ {
+ erase(listtail);
+ }
+#endif
+