Hi & thanks for answering; I should have been more precise, my function works like this: fun :: String -> String look for pat1 in string - if found subst with sub1 look for pat2 in string - if found subst with sub2 look for pat3 in string - if found subst with sub3 recurse until no pattern is found Cheers PE -----Opprinnelig melding----- Fra: Wolfgang Jeltsch [mailto:wolfgang@jeltsch.net] Sendt: 1. oktober 2003 15:36 Til: The Haskell Cafe Emne: Re: Haskell-beginners problem with memory consuption Am Mittwoch, 1. Oktober 2003, 15:18 schrieb Petter Egesund:

[...]

The problem is of course that the string is copied each time I do a substitute, and I wonder if a more experienced haskeller has a better solution to my problem.

It doesn't have to be a problem that the string is copied each time. If you have, e.g., functions f1, f2, ..., fn :: String -> String and do something like f1 (f2 (... (fn string)...)) then string and the intermediate data can be removed by the garbage collector as soon as they are not needed. Unfortunately, from your message it's not very clear to me what exactly you mean, and, unfortunately again, I'm not an expert in Haskell memory management.

I have myself considered these solutions, but they all seems non-elegant; [...]

Indeed, they all look very non-elegant, and I think, there is a better solution.

Cheers,

Petter Egesund

Wolfgang _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe