"Denis Bueno" <[EMAIL PROTECTED]> writes:
> On Sat, Mar 8, 2008 at 9:54 AM, Xiao-Yong Jin <[EMAIL PROTECTED]> 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
> (http://haskell.org/ghc/docs/latest/html/libraries/mtl/Control-Monad-Error.html#t%3AErrorT);
> 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:
> http://sigfpe.blogspot.com/2006/05/grok-haskell-monad-transformers.html
Thanks. I do need to learn some monad transformers. And
this post is indeed very helpful.
Xiao-Yong
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