# cast<R> method

Set<R> cast <R>()

Provides a view of this set as a set of `R` instances.

If this set contains only instances of `R`, all read operations will work correctly. If any operation tries to access an element that is not an instance of `R`, the access will throw instead.

Elements added to the set (e.g., by using add or addAll) must be instance of `R` to be valid arguments to the adding function, and they must be instances of `E` as well to be accepted by this set as well.

## Implementation

    Set<R> cast<R>();