For associative containers, no clear() function throws an exception. erase(k) does not throw an exception unless that exception is thrown by the container's Compare object (if any).
For associative containers, if an exception is thrown by any operation from within an insert or emplace function inserting a single element, the insertion has no effect.
For associative containers, no swap function throws an exception unless that exception is thrown by the swap of the container's Compare object (if any).