> El 10 mar 2016, a las 11:09, Miguel Negrão > <miguel.negrao-li...@friendlyvirus.org> escribió: > >> On 10-03-2016 15:56, amin...@gmail.com wrote: >> Hi Miguel, >> Agreed that preserving state is crucial -- you don't want e.g. your >> volume jumping around every time you replace the node in the graph that >> represents volume. >> >> Midair differs for your WIP supercollider implementation a bit: you can >> replace individual sections of the graph, and the inner sections need not >> have the same types as long as the piece being inserted has the same type as >> what it's replacing. E.g a a graph that counts keypresses and adds 5 to the >> total: >> >> foo :: SFlow GetChar Int >> foo = sMap (+5) <<< sFold 0 (\_ -> (+1)) >> >> Can be replaced by one which returns the (accumulated) length of a string >> starting with the most-recent character: >> >> bar :: SFlow GetChar Int >> bar = sFold 0 (+) <<< sMap length <<< sMap (\(GetChar c) -> dropWhile (/=c) >> "foobarbaz") >> >> ...even though the inner graph elements have different types and have a >> different "shape" -- so you're totally unconstrained by your previous >> decisions about the graph (segment). > > Ok, I get it, that is indeed a different approach. I thought about doing > similar also. But can you make any part of the graph a new hot-swappable > node, or do you have to declare those nodes up-front ? For instance > could you change 'sMap length' in bar to a node ref while keeping the > state of the fold ? >
Yes, you can! You'd say: do nr <- mkNodeRef $ sMap length return $ sFold 0 (+) <<< nr <<< sMap baz where baz (GetChar c) = dropWhile (/=c) "foobarbaz" (The actions are in IO; they can also be in STM) Tom > Best, > Miguel > > -- > > Read the whole topic here: Haskell Art: > http://lurk.org/r/topic/4vZkaPsWqe92OxGk2A5Uuk > > To leave Haskell Art, email haskell-...@group.lurk.org with the following > email subject: unsubscribe -- Read the whole topic here: Haskell Art: http://lurk.org/r/topic/4O3cSSEhhVCTjKqixzcJq To leave Haskell Art, email haskell-...@group.lurk.org with the following email subject: unsubscribe
