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

I answered my own question by reading this monad-prompt example: http://paste.lisp.org/display/53766 But one issue remains: those examples show how to make play EITHER a human or an AI. I don't see how to make a human player and an AI play SEQUENTIALLY (to a TicTacToe, for instance). Yves Parès wrote:

Thanks, I looked at the operational package (since it seemed simpler). I see its interest when building sets of operations. I think I see how I could apply it to my current problem. I saw in the tutorial the sentence: "The ability to write multiple interpreters is also very useful for implementing games, specifically to account for both human and computer opponents as well as replaying a game from a script." So I'm supposed to write 2 functions, one interpretHuman (running in IO, and prompting the user), and one interpretAI (running in Identity)?

Are there examples of such games using operational?

Heinrich Apfelmus wrote:

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Gwern Branwen wrote:

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Yves Parès wrote:

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[...] 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

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