Creating a future/promise object

[Sebastiaan Koppe via Digitalmars-d]

On Monday, 6 July 2015 at 20:56:04 UTC, Frank Pagliughi wrote:
>     void set_result(int retCode) {
>       synchronized (mut) {
>         this.retCode = retCode;
>         completed = true;
>         cond.notify();
>       }
>     }
>
>     int get_result() {
>       synchronized (mut) {
>         while (!completed)
>           cond.wait();
>         return retCode;
>     }

Instead of pulling values out, have you considered pushing them? 
E.g. by supplying a delegate that gets called when the 
asynchronous action completed.