A mutable collection of subscriptions, which is itself a subscription.
A mutable collection of subscriptions, which is itself a subscription.
When unsubscribed from, all containing subscriptions are unsubscribed. Subsequently added subscriptions are automatically unsubscribed.
Forwards unsubscribe
to another subscription.
Returns a subscription that runs the specified action when unsubscribed.
Returns a subscription that runs the specified action when unsubscribed.
The action **will not be** executed more than once.
Does not unsubscribe from anything.
Default subscription implementations.