[Haskell-cafe] Exception handling when using STUArray
xj2106 at columbia.edu
Sat Mar 8 14:19:01 EST 2008
"Denis Bueno" <dbueno at gmail.com> writes:
> On Sat, Mar 8, 2008 at 9:54 AM, Xiao-Yong Jin <xj2106 at columbia.edu> wrote:
>> > 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?
>> In my case, because I choose a index of the array according
>> to certain value in the array, if there is NaN or Infinity
>> in the array, the code breaks. So I guess, to fix the code,
>> I would probably use isNaN/isInfinite and throw an exception
>> when that happens.
> I see. In that case, you should check out the ErrorT monad transformer
> it lets you throw an error conveniently using Either. It may or may
> not fit your needs, but at least it's worth knowing about.
> And in case you don't understand monad transformers: if you understand
> the State monad, the following post is a fairly nice, minimal
> explanation of monad transformers:
Thanks. I do need to learn some monad transformers. And
this post is indeed very helpful.
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