[Haskell-cafe] Exception handling when using STUArray
lemming at henning-thielemann.de
Sat Mar 8 15:33:39 EST 2008
On Sat, 8 Mar 2008, Denis Bueno wrote:
> On Sat, Mar 8, 2008 at 12:29 AM, Xiao-Yong Jin <xj2106 at columbia.edu> wrote:
>> I'm using STUArray in some of my time critical number
>> crunching code. I would like to know some way to catch the
>> exceptions raised in the ST monad, ie. ArrayException.
> I am also using STUArray from some time-critical code; however, I
> don't deal with ArrayException, or any exceptions for that matter.
> What besides an out-of-bounds read or write might throw an
> ArrayException? If it is out-of-bounds reading or writing, surely
> that indicates a bug in your program that you'd rather fix than catch
> the exception, no?
Another instance of mixing up exceptions and errors in the Haskell
> Also, if you're using GHC, note that the ArrayException documentation says:
> "(NOTE: GHC currently does not throw ArrayExceptions)."
>> Looking through the Control.Exception module, I understand
>> that those functions can only be used within IO monad. So
> This isn't quite true, if I understand what you mean. The function
> throw can be used from any code
> But you must catch exceptions in the IO monad.
>> my question is, what the best way to do exception handling
>> in STUArray is. Plus, it would be helpful if I can also
>> raise an exception in ST monad, but how?
> I think what I noted in the last paragraph solves this problem.
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