Safe Haskell | Safe |
---|---|

Language | Haskell2010 |

Monadic Stream Functions are synchronized stream functions with side effects.

MSFs are defined by a function `unMSF :: MSF m a b -> a -> m (b, MSF m a b)`

that executes one step of a simulation, and produces an output in a
monadic context, and a continuation to be used for future steps.

See the module Data.MonadicStreamFunction.Core for details.

MSFs are a generalisation of the implementation mechanism used by Yampa, Wormholes and other FRP and reactive implementations.

When combined with different monads, they produce interesting effects. For
example, when combined with the `Maybe`

monad, they become transformations
that may stop producing outputs (and continuations). The `Either`

monad
gives rise to MSFs that end with a result (akin to Tasks in Yampa, and
Monadic FRP).

Flattening, that is, going from some structure `MSF (t m) a b`

to `MSF m a b`

for a specific transformer `t`

often gives rise to known FRP constructs.
For instance, flattening with `EitherT`

gives rise to switching, and
flattening with `ListT`

gives rise to parallelism with broadcasting.

MSFs can be used to implement many FRP variants, including Arrowized FRP, Classic FRP, and plain reactive programming. Arrowized and applicative syntax are both supported.

For a very detailed introduction to MSFs, see: http://dl.acm.org/citation.cfm?id=2976010 (mirror: http://www.cs.nott.ac.uk/~psxip1/#FRPRefactored).

# Documentation

module Control.Arrow