Part of "Build your own Future in Go" article

go_future.go

func (this *future[T]) Get() Result[T] {
   if this.completed {
      return this.result
   } else {
      fmt.Println("Need to wait...")
      select {
      case <-this.wait:
         return this.result
      case <-this.ctx.Done():
         return &result(T){failure: this.ctx.Err()}
      }
   }
}