return some value in the smallset . if there is always at least one value in the smallset during the lifetime of this call , it will not return null , since by the invariant , #first must be non-null . concode_field_sep ConcurrentMap<K,SmallSet<V>> map concode_elem_sep T first concode_elem_sep Set<T> rest concode_elem_sep Set<Object> TOMBSTONE concode_field_sep SmallSet<V> getOrCreateEntry concode_elem_sep void clear concode_elem_sep void markDead concode_elem_sep V putAndGet concode_elem_sep T putAndGet concode_elem_sep SmallSet<V> getEntry concode_elem_sep void remove concode_elem_sep void remove concode_elem_sep boolean isDead
T function ( ) { return first ; }