Re: [Haskell-cafe] "Read-only" functions in State Monad

Hi Ken, 2007/7/1, Ken Takusagawa :

I'd like to have a state monad with the feature that I can somehow annotate using the type system that some functions are only going to read the state and not modify it.

I would suggest declaring a MonadReader instance for State, and writing your read-only functions as f :: MonadReader s m => Param -> m Result Would that solve your problem? Best, - Benja