Nice! Thanks! On Tuesday, April 28, 2015 at 9:45:07 PM UTC-7, Gabriel Gonzalez wrote: > > Add a `StateT` layer to each component's base monad. They will then > share that state. Here is an example: > > import Control.Monad (forever) > import Control.Monad.Trans.State > import Pipes > > producer :: Producer Int (StateT Int IO) r > producer = forever (do > n <- lift get > lift (put $! n + 1) > yield n ) > > consumer :: Consumer Int (StateT Int IO) r > consumer = forever (do > n <- await > lift (lift (print n)) > lift (modify (+ 1)) ) > > main :: IO () > main = evalStateT (runEffect (producer >-> consumer)) 0 > > That will print: > > 0 > 2 > 4 > 6 > ... > > > > On 04/28/2015 09:36 PM, Ray Qiu wrote: > > How to share state between pipes Consumers/Pipes without using ioref? > Thanks! > -- > You received this message because you are subscribed to the Google Groups > "Haskell Pipes" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to haskell-pipe...@googlegroups.com <javascript:>. > To post to this group, send email to haskel...@googlegroups.com > <javascript:>. > > >
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