[Haskell-cafe] Re: Simple game: a monad for each player

Gwern Branwen wrote:

Yves Parès wrote:

...

[...] But when running the game, the program cannot "switch" from a player's monad to another.

Do you have any suggestion?

Your desires remind me of the MonadPrompt package http://hackage.haskell.org/package/MonadPrompt, which IIRC, has been used in some game demos to provide abstraction from IO/test harness/pure AI etc.

The game demo can be found by chasing links from the package documentation: http://int-e.home.tlink.de/haskell/solitaire.tar.gz There's also my package "operational" http://hackage.haskell.org/package/operational which implements the same concept. It's throughly explained here: http://apfelmus.nfshost.com/articles/operational-monad.html http://projects.haskell.org/operational/ Regards, Heinrich Apfelmus -- http://apfelmus.nfshost.com