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F# Async Cache
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| let cache (a:Async<'a>) : Async<'a> = | |
| let tcs = TaskCompletionSource<'a>() | |
| let state = ref 0 | |
| async { | |
| if (Interlocked.CompareExchange(state, 1, 0) = 0) then | |
| Async.StartWithContinuations( | |
| a, | |
| tcs.SetResult, | |
| tcs.SetException, | |
| (fun _ -> tcs.SetCanceled())) | |
| return! tcs.Task |> Async.AwaitTask } |
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