Events in D

[bitwise via Digitalmars-d]

On Tuesday, 29 August 2017 at 16:25:33 UTC, Jonathan Marler wrote:
> [...]
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While responding to your question, I provided an example for 
needing access to the host's data members (Mutex), but failed to 
provide an example of needing an extra delegate-to-host for an 
event. I just hit that case though, and it's timers/animations.

For any app where battery life is a concern, you can't just spin 
for no reason. So when you add a handler to a timer/animation 
event, you have to kick off whatever timer handles the animation 
if it's not running. Likewise, you have to stop it when all 
events have been removed.