I missed the chance to comment on github...

This also works for implementing futures and it's simple, type-safe and can 
be used with select:
Of course the syntax is not as nice as built-in futures.

On Sunday, October 16, 2016 at 2:40:32 PM UTC+2, Sokolov Yura wrote:
> "future" is commonly used synchronization abstraction.
> It could be implemented in a library, using mutex, channel and interface.
> Example: 
> https://github.com/Workiva/go-datastructures/blob/master/futures/selectable.go
> But obviously, semantically future is just a channel with buffer of 
> capacity 1, but receivers do not pop
> value from a buffer, but instead every receiver receive same value. And 
> "filling" future awakes all
> receivers simultaneously, similar to "closing of channel".
> So I propose to introduce "future" as a same internal type as a "channel".
> It will share representation and lot of code with buffered channel (of 
> capacity 1).
> https://github.com/golang/go/issues/17466

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