[Haskell] Re: ST/STRef vs. IO/IORef
wolfgang at jeltsch.net
Thu Aug 4 04:29:23 EDT 2005
Am Mittwoch, 3. August 2005 19:07 schrieb Srinivas Nedunuri:
> I have a bunch of ST code, and then somewhere in there I had the misfortune
> of needing to insert a file copy and bam I'm now stuck with the dang IO
> monad which goes and "infects" the entire program.
You can use something like
myPureComputation :: String -> ST s Int
where the parameter denotes the file content. Then you do something like
fileContent <- readFile "myFile"
print $ runST $ myPureComputation fileContent
So you don't need to infect your ST computation with I/O the same way you
often don't need to infect an ordinary pure calculation with I/O.
Or did you mean something different?
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