Represents AssignableCancelableF instances that are also BooleanCancelableF.
Interface for AssignableCancelableF types that can be assigned multiple times.
Builds an AssignableCancelableF instance that's already canceled.
Represents an AssignableCancelableF with no internal state and that doesn't do anything, either on assignment or on cancelation.
Represents an AssignableCancelableF with no internal state and that doesn't do anything, either on assignment or on cancelation.
It's a no-op.