Edward Amsden schrieb:
Aditya: Not quite, because I'm actually looking to extract values from a functor (Maybe) with a default.
Stephen: Thanks, I'll take a look at those. I do have a need for it. I'm writing a very similar library to Yampa. (I would be patching Yampa, but the code is a mess, so I decided to try starting from scratch.) Basically, I have a signal processing loop, where values are passed updated with a Maybe, representing whether there is or is not a change to the value.
Hm, I have written a lot of signal processing stuff in Haskell (see packages synthesizer-core, synthesizer-llvm etc.), but so far I did not need to cope with all Maybes in a data structure at once. Does it happen very often for you, that a value does not change? I only need a Maybe for showing when a signal stops. But every signal processor maintains its own Maybe (synthesizer-core:Synthesizer.Signal.State, Synthesizer.Process.Causal). Btw. there is also haskell-art@lurk.org mailing list for discussing (audio) signal processing issues.