unlinks it from the list, and returns \ref cds::urcu::exempt_ptr "exempt_ptr" pointer to the item found.
If \p key is not found the function returns an empty \p exempt_ptr.
- @note The function does NOT dispose the item found.
+ @note The function does NOT dispose the item found.
It just excludes the item from the list and returns a pointer to item found.
You shouldn't lock RCU before calling this function.