\p second is true if new item has been added or \p false if the item with \p key
already is in the list.
- @warning For \ref cds_intrusive_MichaelKVList_hp "MichaelKVList" as the ordered list see \ref cds_intrusive_item_creating "insert item troubleshooting".
- \ref cds_intrusive_LazyKVList_hp "LazyKVList" provides exclusive access to inserted item and does not require any node-level
+ @warning For \ref cds_nonintrusive_MichaelKVList_gc "MichaelKVList" as the ordered list see \ref cds_intrusive_item_creating "insert item troubleshooting".
+ \ref cds_nonintrusive_LazyKVList_gc "LazyKVList" provides exclusive access to inserted item and does not require any node-level
synchronization.
*/
template <typename K, typename Func>