|Portability||non-portable (multi-param classes, functional dependencies)|
This module is inspired by the paper
/Functional Programming with Overloading and
Mark P Jones (http://web.cecs.pdx.edu/~mpj/)
Advanced School of Functional Programming, 1995.
|class Monad m => MonadState s m | m -> s where|
get returns the state from the internals of the monad.
put replaces the state inside the monad.
|get :: m s|
|put :: s -> m ()|
|modify :: MonadState s m => (s -> s) -> m ()|
Monadic state transformer.
Maps an old state to a new state inside a state monad.
The old state is thrown away.
Main> :t modify ((+1) :: Int -> Int)
modify (...) :: (MonadState Int a) => a ()
This says that modify (+1) acts over any
Monad that is a member of the MonadState class,
with an Int state.
|gets :: MonadState s m => (s -> a) -> m a|
|Gets specific component of the state, using a projection function
|Produced by Haddock version 2.3.0|