Assign to this set the union of this set with the specified rhs.
Assign to this set the union of this set with the specified rhs set (i.e., a set containing elements that are in either this set or the rhs set, or in both sets), and return a reference providing modifiable access to this set.
a reference providing modifiable access to this set
| Name | Description |
|---|---|
| rhs | set to union with this set |