Import std.events.event

Subscription

std.events.event

class

Public Class Subscription

A handler's place on an Event, which Cancel takes it off. It holds neither the Event nor the handler, so keeping one keeps neither.

Examples

Local ticked = Event<Int>()
Local total = 0
Local onTick = Function(n: Int)
    total += n
End Function

Local subscription = ticked.Subscribe(onTick)
Expect(subscription.IsActive)
ticked.Emit(2)
subscription.Cancel()
subscription.Cancel()
ticked.Emit(3)
Expect(total == 2 && !subscription.IsActive)

std/events/event.fb, line 240

Public Method Cancel() method #

Takes the handler off its Event, so no Emit after calls it, and lets go of it. Cancelling it again, or once the Event has gone, does nothing.
Public Property IsActive: Bool property #

Whether the handler is still on its Event.

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