On Fri, Jan 30, 2004 at 09:21:58AM -0700, nickgrey@softhome.net wrote:
Hi,
I'm writing a game in Haskell. The game state includes a lot of closures. For example, if a game object wants to trigger an event at a particular time, it adds a function (WorldState -> WorldState) to a queue. Similarly there are queues which contain lists of functions which respond to events. (CreatureAttackEvent -> WorldState -> WorldState)
I'd like to be able to save the game state to disk so that it can be reloaded. Obviously, these closures are now a problem, as they can't be stored.
I could obviously, replace all the functional values with non-functional ones, and have a big case statement specifying the behaviour associated with each constant. However, I don't really like this solution.
Just a vague idea: I think it would be possible to apply some kind of automatic whole-program transformation that would do most (if not all) the work for you. The relevant keywords may be "defunctionalisation", "closure conversion". Do you want to be able to save game in one version of the program and restore it in a newer version? This can be difficult. Best regards, Tom -- .signature: Too many levels of symbolic links