I'd like to be able to change the callback of a vibe.d Timer (eg created with http://vibe-core.dpldocs.info/v1.9.3/vibe.core.core.createTimer.html) after creation, something like:

auto timer = createTimer();
timer.rearm(duration, /*...*/);
timer.callback = delegate {
   // things
}

An alternative method would be to recreate the timer, like so:

auto timer = createTimer();
timer.rearm(duration, /*...*/);
auto timer = createTimer();
timer.rearm(duration - timer.elapsed);

However, I can't find an `elapsed` property or similar in the documentation.

On Tuesday, 25 August 2020 at 18:42:53 UTC, codic wrote:
> I'd like to be able to change the callback of a vibe.d Timer (eg created with http://vibe-core.dpldocs.info/v1.9.3/vibe.core.core.createTimer.html) after creation, something like:
>
> auto timer = createTimer();
> timer.rearm(duration, /*...*/);
> timer.callback = delegate {
>    // things
> }
>
> An alternative method would be to recreate the timer, like so:
>
> auto timer = createTimer();
> timer.rearm(duration, /*...*/);
> auto timer = createTimer();
> timer.rearm(duration - timer.elapsed);
>
> However, I can't find an `elapsed` property or similar in the documentation.

I did not try it myself, but you can make an object which is accessible from both callback scope and outside scope. Depending on the state of the object it will call different functions. So if you want to change the callback in the meantime, you just change the state of the object.

On Tuesday, 25 August 2020 at 18:42:53 UTC, codic wrote:
> I'd like to be able to change the callback of a vibe.d Timer (eg created with http://vibe-core.dpldocs.info/v1.9.3/vibe.core.core.createTimer.html) after creation, something like:
>
> auto timer = createTimer();
> timer.rearm(duration, /*...*/);
> timer.callback = delegate {
>    // things
> }

Would creating a dynamic redirection function as delegate serve your purpose?

https://dlang.org/library/std/functional/to_delegate.html

You can also pass object having `opCall` to `to_delegate` and th is could also provide dynamic dispatch.