Class Task<T, P>

Tasks represent an asynchronous operation that will be finished at some unknown point in the future. Tasks can report their progress, and will end either through finishing into a value, or due to being cancelled. Tasks are designed to provide a thread-safe general purpose abstraction for dealing with any asynchronous operations. The Task class satisfies EventFilter and as such is listened to using the Geode events system; tasks may have multiple listeners, and even if a listener is attached after the Task has finished it will receive the finished value. Tasks are a very cheap and tiny struct that just have a reference to a task Handle; as such, Tasks may (and should) be copied around without worry. It should be noted that a Task never owns itself - the listener(s) of a Task are expected to hold an instance of the Task for as long as they intend to listen to it. Usually this is done via just setting the Task as the filter to an EventListener, as the EventListener manages the lifetime of its filter Task itself does not carry a notion of fallibility aside from cancellation; it is customary to use the Result type in Tasks that might finish to a failure value. Once a Task has finished or has been cancelled, it can no longer be revived